Dec - RCSoaring.com
Contents
1. FlightView 3 2 Sep 3 Fit 1 alt ER File Data Setup Help Sample Rate 5 samplefsvsecond 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 0 2 4 6 8 10 Delta Alt 19 ft C Zero Stat Aude f Start Marker Rate 2 fimin 4 ZOOM 4d 4 PAN gt B Zero End End Marker Flights 1 Y v Above The computer generated plot of Lee s Organic RES flight Note the steep dive from 1095 feet Left The RAM 2 Altimeter Data logger from Randy Brust at Soaring Circuits with a quarter for size comparison Below the RAM 2 installed in the Organic RES fuselage C NE LI eng W R En Tee December 2005 4 Tower Hobbies little park flying hotliner the Ventura One of our new club members j showed up with one ofthese and itis the fastest Rudder Elevator electric I have er Tes ever flown Lotsa fun for not much money 119 97 Might even thermal on a good day raar cet CAS GAMMEL 7012 E 3 ee 3 ae E H zech R C Soaring Digest around the shop house or garage when you couldn t quite see well enough to do the job This is the fix for that for under 20 Here is a link to the Ray O Vac web site and the light lt http store sundancesolar com ra3ledhewiba html gt I am including a photo I took of this great idea The web page2. December 2005 Vol 22 No 12 Front Cover Andy Page s beautiful Bird of Time graces the late September sky above 60 Acres South home field of the Seattle Area Soaring Society This photo is one of a series taken as Andy was setting up for landing after a 65 minute flight Photo by Dave Beardsley Identical Servos Make sure 35 Tests of HS 81MG and HS 85MG servos plus endpoint adjustment servo rate adjustment 101 Phil thought his flaperon servos were identical They weren t After a near major mishap Phil learned the truth about servo variations and endpoint adjustment By Philip Randolph Andy Page s Bird of Time 38 Andy provides information on his beautiful Bird of Time By Andy Page Peter Wick s Airfoils for Plank Planforms 39 Usage information and coordinate tables for five airfoils designed for tailless plank planforms PW5 1 PW 106 PW98mod PW75 and PW 121 1 By Peter Wick The Annual Christmas and Gift giving Ideas List 45 RCSD Columnists give a quick overview of items fellow RC soaring enthusiasts might want to receive Back cover Larry Smith launches his DAW Schweizer 1 26 from the bluff at Clark Cove Maine This flying site is on private property and is about 40 minutes from Portland According to DownEast Soaring Club members Lacy enjoys the flying nearly as much as the pilots Photo by Steve Savoie December 2005 Vol 22 No 12 In the Air RC Soaring Digest Editorial SZD 24 4A Fok
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9. a few reasons First they come in rolls about three inches wide which forces the modeler to lay many strips of covering down resulting in a striping effect and plenty of seams Second the material itself is translucent and so any marks on the wing itself will show through In my case these marks were the wing taping diagram marks Also where the tape overlaps you get a darker strip which just doesn t look right I opted for some iron on covering material from a hobby store a deep dark red for the top silver for the bottom and yellow for the wing tips I was able to use fewer individual pieces of the 34 Identical Servos Make sure Tests of HS 81MG and HS 85MG servos plus Endpoint adjustment servo rate adjustment 101 by Philip Randolph lt amphioxus juno com gt The old hands know this Ata SASS Seattle Area Soaring Society meeting I showed the test and then set it up so the guys could see two servos side by side moving at different rates Sherman Knight said When JR 641s first came out I d get fifteen at a time I d put long skinny sticks of balsa on the servo arms and match them up But when the computer radios came out I stopped worrying about it He stopped worrying because he sets his endpoints Not everyone has endpoint adjustments However one of the guys I m flying with at Saddle is Damian Monda I still haven t figured out why Damian thinks putting mixers in his planes is su
10. carried by Horizon Hobby lt http www horizonhobby com gt is shown above Tom December 2005 Left Delta Machinery 12 inch Disc Sander with Integral Dust Collection Model 31 120 Right Columbian Wilton Tool Company 8 Piece Precision Mini Pliers Set the Wilton Tool Company This set can be ordered through TOOL CRIB NET lt http www tool crib net columbian_precpliers html gt We ve been looking for a realistic flight simulator for some time and finally settled on X Plane because it is incredibly realistic does not tie us down to one specific set of aircraft and is cross platform Macintosh Windows and Linux Version 8 of X Plane has enhanced landscape graphics You can download specific areas of the world or the whole R C Soaring Digest Bill amp Bunny Kuhlman While sets of five mini pliers are readily available from the big home improvement chains we recently found a set of eight high quality mini pliers diagonal cutting linesman long nose end nipper bent nose flat nose needle nose round nose in a very nice leather case for around 40 These instrument have very comfortable handles are easily manipulated and of course all are self opening The set is made by Columbian the brand name for the new line of hand tools from new JR Synthesized Transmitter Module Part JRPTXMS under 99 99 and Receiver Part JRPR2000 199 99 which will allow me plenty of flexibility when atte
11. see Tom s catalog go on line to www tmrcsailplanes com December 2005 ColdHeat soldering iron of data by recording once a second or for about an hour by recording every 0 1 seconds The latter is useful for HLG models The included altimeter plot shows the dynamics of an interesting flight I had earlier this fall A strong gust came through while several fliers were soaring in a thermal The gust picked up several models and chairs on the ground and blew them down wind My Organic RES was up at 1095 feet when I turned to see what was happening Bad idea When I looked back I didn t see the sailplane I was flying A few seconds later someone yelled Pull up Pull up You can see the pull out at about 100 feet on the plot I continued a shallow dive but I was getting back to the field and needed the speed After crossing a road I traded R C Soaring Digest From my local tool store I found some items that make really good stocking stuffers These items are things that you may not use every day but are sure nice to have First there is the Coleman cordless ColdHeat soldering tool for 19 99 It really works I have already used mine Next there is a diamond needle file set at 9 99 The next item is a pick and hook set for 3 99 The last item or items is a set of four Quick Jaw ratchet clamps a must for any builder 9 99 fora set of four Wish you alla very Merry Christmas and a Happy New Yea
12. sklejka lamint umha plesigas g iw December 2005 8 B C Soaring Digest December 2005 9 R C Soaring Digest 11 rane RSS RSE AL December 2005 12 B C Soaring Digest 13 December 5 ES zt F k Papa Tl u T 1 ry 5 3 e eg E Ee 4 p gt 2 men 14 B C Soaring Digest LO N i 0 0 O o e gest PN Q 3 E d W Y 8 ON URL T 8 8 k L KREE LAT 17 December 2005 asa LE pneu AN E ALAS tt BORK F sl LJ t1 Sa Pi Y An E Gen dn 1 Meli mm Lom 1 Be e R C Soaring Digest 18 LO N i 0 0 O o e Q Q ee ess L ete Er an Aa A n sun LI P PEUR Per a December 2005 Lee wishing it were his Speed Astir R C Soaring Digest 3 3 f 7 Ke 1 ze 24 H gt WK 7 d mg TM pe rar d e et Ds Are a t TW Vy FCT CL ou The Las Vegas Valley Soaring Association club house instructors Bill Tisdale and Jay McDaniel worked with me to make an appointment for the two place glass ship 10 This Se
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19. SD We encourage anyone who wishes to obtain additional information to contact the author Copyright 2005 R C Soaring Digest Published by B2Streamlines com October 2005 5110 24 24 Foka 4 Standard Class Sailplane Text and Photos by Mark Nankivil lt nankivil covad net gt Thanks also go to Dale King for taking me out to Caddo Mills Texas to see the sailplanes of the Southwest Soaring Association SZD 24 4A Foka 4 Standard Class Sailplane Specifications Wingspan 14 98 m Length 7 0m Height 1 7 m Dihedral 2 degrees Wing Area 12 16 sqm Aspect Ratio 18 5 Wing root c 1 218 m NACA 63 618 Wing tip c 0 39 m NACA 4415 Weight 245 kg 385 kg max loaded Max speed 260 km hr Stall speed 70 km hr Min sink 0 7m s 79km hr Max L D 34 1 94km hr R C Soaring Digest Gary s Foka 4 15 the only one flying in the U S to his knowledge though he knows of one presently being restored in California Gary was kind enough to loan me the sailplane s service manual from which the accompanying drawings were copied A few points of interest when looking over the photos and drawings of this classic sailplane are the canopy and the way it rolls forward when opened and how the wing is attached to the fuselage Note too the fixed main wheel located behind the CG which is a nice feature for scale aerotow and simplifies the overall layout for 2 scale model It s pretty amazing to realize this is
20. a 4 A walkaround of a classic high performance composite sailplane including a complete set of factory plans Text and photos by Mark Nankivil The Natural Side of Thermal Soaring Lee thermals a full size sailplane Lee visits the Las Vegas Valley Soaring Association and pilots a Grob 103 with Keith Colmer By Lee Murray Have Sailplane Will Fravel Recycle Resurrecting a GWS Spitfire as a Power Scale Sloper A nearly trashed GWS Spitfire is transformed into a Splatfire a pretty cool PSS ship By Tom Nagel Windrider Aviation Bat A kit review of a well designed easy to build economical durable slope soarer that is fun to fly By Kyle Saltzman CONTENTS LA gt 26 29 Kyle s review m Windrider me was written over a period of several months and is a well balanced evaluation of a relatively little known tailless sloper Philip is a fellow member of the Seattle Area Soaring Society and his servo testing article is the result of our request that he put into writing a visual presentation he gave at a club meeting earlier this year We think you ll find Philip s writing style to be both informational and entertaining Peter contacted us in relation to placing his airfoil data on our B2Streamlines web site then gave his permission to place this information in RCSD asa way of announcing the download availability on lt http www b2streamlines com gt Additionally Peter mentioned he had written several art
21. a 40 year old sailplane design and it s to Gary s credit that the Foka 4 can still be seen thermalling over Texas Thanks to Gary Busk for the time taken to allow us to photograph his sailplane and loaning the service manual to me The Foka 4 was the final production development of the SZD 24 series manufactured by SZD Bielsko in Poland Approximately 200 of the SZD 24 series were manufactured starting in 1961 Developed as a Standard Class sailplane the Foka 4 15 of mixed construction with a fiberglass composite forward fuselage section and the remainder of the airframe being made of wood The ailerons elevator and rudder are fabric covered and the wings were fabricated with plywood skins being built up in concrete molds which resulted in excellent surface accuracy and finish The SZD 24 4A Foka 4 featured in this walk around is owned by Gary Busk of the Dallas Ft Worth area and is flown from Caddo Mills airport just east of Dallas Gary flies his Foka 4 regularly and we were lucky enough to be at the airport when he returned to the field from a successful cross country flight December 2005 R C Soaring Digest gt lt D Z z2 OAD 22 AZ Z ZZ 1 T E E Z 7 2 7 A MP erp V ei y i e OSSE gt FS 171 50 Je er de Z A ji dE ck T I ef iE e iu 3 E s 1
22. a former modeler looked busy assembling his Grob Speed Astirby Keith Colmer and Lee Murray in front ofthe Grob 103 The hill that provided lift for Lee s flight is directly above the nose ofthe Grob R C Soaring Digest 24 Since Bill was busy Iteamed up with member Keith Colmer a commercial rated glider pilot Air Force test pilot and new member 00 LVVSA He had compassion on me and agreed to take me up for the customary charges for a visiting pilot The lift had been pretty weak and other pilots had been coming back down without any altitude gain after release I Em believe we had the honor of being the first Tee ely jen to work some lift from the face ofthe Vn highest hill that can be seen over the nose of the Grob in the shot with Keith and me We don t know how much of the lift was slope liftand how much was from thermals off the side of the hill facing the sun but we worked 6 knot lift for a while Without much stick time I was clumsy and didn t get as much as Keith could have gotten out of that thermal but the point is that I got to thermal the beautiful glass ship mix with glider pilots and got the feel of being a member of a glider club So my recommendation to you an RC sailplane enthusiast is to try full size soaring November 2005 25 Be om J a 4 R C Soaring Digest RECYCLE HAVE SAILPLANE WILL HAVEL Tom Nagel lt tnagel iwayn
23. ably more likely to get servos that don t match out of different batches They order a load of components from Korea or wherever and the components are probably tested to be within tolerances of each other But the next batch of components may be from a different supplier So who knows whether they match the first set 36 Even if your flaperon spoileron or elevon etc servos are mismatched in response rate if you setthe endpoints for equal deflection they will be balanced across their range You can indeed set em an forget em Well provided you did everything else right If those wing servo arms aren t centered at the same angle to the wing you ll induce unequal mechanical differential that you ll never get rid of Additionally remember to make sure your servo arm is installed so that it won t hit its internal mechanical stop before it moves as faras you want it to That s another reason to trim right mechanically before you fine tune electronically Keeping the suspense in programming our radios But please don t worry that you now possess the secret and esoteric knowledge that will take the suspense out of programming your radio Transmitter manuals and manuals in general will always give us half intelligible directions so guys like me will still start writing articles like this one recounting mistakes and misinterpretations And even ifyou do endpoints correctly you can take trustin this Be
24. ave Garwood dollars Radio gear is no exception and for the BatI used a Hitec Neon SS FM 2 channel radio with elevon mixing functions This radio actually serves double duty It also controls my Windrider Bee one of my other flying wings In the plane itself sit a Hitec multi channel receiver two standard size Hitec servos and a four battery flat pack I have R C Soaring Digest was skeptical about the Bat s performance in all but the heaviest winds Those fears proved to be unfounded however as I ll explain later during the flight testing Once balanced the builder needs only to cover the plane and go fly Radio Gear One aspect that I love about soaring with simple sailplanes is low cost So much fun for so few Kyle and his completed Windrider Bat ready for some test flying Photo by Dave Garwood 32 Suggested Modifications Nobody s perfect however and here follows the list and explanation of my complaints about this kit stability excellent handling and good aerobatic ability Loops and rolls were performed easily and although I m not much of an inverted flyer I believe that in the right hands the Bat could easily First and foremost is the lack of quality of some of the kit contents specifically the control linkages and the covering materials Dave Garwood photo 33 handle this as well Because of its weight the Batis not the best plane for very light winds So there you
25. d a hardware package For more information go to lt www arthobby com gt Price is 145 00 The two above kits require micro radio equipment so I m looking at the Sombra Shadow 3 7 channel crystal less receiver This compact receiver is the smallest and lightest 8 grams with antenna 7 channel in the world Plus it s FM PPM compatible To program this crystal less receiver just plug the programmer into the receiver dial in the channel that you want power up the receiver push the button on top of the programmer and you re done Easy If this receiver sounds good to you contact Barry Kennedy at lt www kennedycomposites com gt Price is 89 99 Jerry Slates Well it s that time of year again Have you submitted your Christmas wish list Dropped any hints like leaving a magazine or catalog open to a certain page day after day WellI have let my wants be known What I want is a small slope plane and a small thermal sailplane that will fit behind the seat of my Dodge pickup So that if I m out someplace and I run across a nice flying site I can stop do a quick charge on my radio equipment and fly A slope model that I m looking at is a 1 8 scale SGS 1 26 Thisisan EPP foamie from TMRC Tom Martin Radio Control The kit consist of a lot of pre cut foam miscellaneous hardware carbon spars butyrate canopy laser cut ply and balsa parts wing rod hinges and many more items too numerous to list Price is 109 00 To
26. eed of nose weight so I had gooped some fishing weights inside the rubber spinner and epoxied a big flat iron washer to the front of the fuse right behind the spinner Ileftthose 28 Dave Garwood photo 29 Windrider Aviation Bat Kit Review by Kyle Saltzman lt aulethemaker hotmail com gt photos by Dave Garwood and Kyle Saltzman Elevons combine the individual functions of ailerons and elevators the controlling flaps found on conventionally designed planes The kit comes with the pre molded wing halves balsa elevons control linkages pre cut vertical stabilizers carbon fiber rods for the securing of the stabilizers pre cut hatch coverings strapping tape covering tape and an instruction booklet ike other Windrider Aviation products I ve tested the Batisa well designed sailplane A durable slope soarer that is easy to build economical and fun to fly the Batcomes with everything you need to start building fast One needs only to pick outa two channel radio with elevon mixing functions As the Batis a flying wing a simple design with no fuselage the elevons are responsible for all the movements of the plane December 2005 The most important components of the Bat kit are a pair of EPP foam wing halves shaped by injection molding The mold includes tight fitting servo pockets and pockets for the radio receiver and the on board battery pack The kit also contains a pair of carbon fiber
27. et net gt Resurrectinga GWS Spithre asa Power Scale Sloper days and then I went back and hadanotherlookatit Gee that wingreallylooked good In the fuse none of the pushrods had gotten bent and all the servos looked OK All those adhesive decals that GWS gives you with their kits were kind of holding the pieces together The five big Styrofoam fuselage pieces fit back together pretty well I decided to take a shot at piecing the fuse back together with 5 minute epoxy and see if I could make a sloper out of the remains of the Splarfire 27 glitched Ilooked just in time to see the plane smack into the ground a hundred yards away I took a bag and walked over The wing was intact but the fuselage was definitely tact It was tact in pieces actually five big pieces and a few smaller bits The prop shaft was bent and the plastic motor mount was fractured It looked like I had to find a home for some used servos And a new name for the plane too Maybe the Splatfire The mess lay on my workbench for a couple of wheels and were designed to take of and land on hard surfaces I am glad to report that I learned how to fly the Spitfire before totally destroying it and had a lot of fun with it over a year and a half If you are planning to build a powered version of the GWS Spitfire or any of the other similar GWS war bird kits I have some tips for you Can t discuss that here though Gordy is watching T
28. f videos DVDs to choose from that would make for an excellent evening in front of the TV ona cold winter s night And there is an excellent and often funny music CD by Ed Kilbourne called Cloudbase which is well worth having on hand Be sure to check out their online store at lt http www ssa org gt Another calendar my mother has given me over the years is the Segelflug Calendar which is available from Knauff amp Grove Soaring Supplies A larger format calendar than the Soaring Society of America s calendar it fits well on my office wall and the images suitably framed make for excellent trophies at contests Check out their website at lt http www eglider org gt I am presently building a couple of new sailplanes which will be guided by my new JR9303 Transmitter To go along with this fine piece of equipment I m eyeing the The Spektrum DSM Digital Spectrum Modulation System includes a transmitter module JR KO Futaba Hitec or Airtronics and a special receiver Available now with three channels for surface use it operates on the 2 4ghz worldwide band 5 I saw JR s new spread spectrum technology transmitters and receivers demonstrated at length last weekend at the Columbus JR Indoor Electric Fly Operating indoors flying brushed and brushless electrics in a very noisy and crowded environment they appeared to be flawless I want one And for once it doesn t matter what channel Spektrum s DSM System
29. ful with the wood selection though and the extremities are very lisht which no doubt contributes to the nimble handling I ve done very well with it in the local club contests over the past three years The cover photo was taken at the end ofa 65 minute flight my last flight for the season at 60 Acres the weekend before Visalia If I need another one I m ready in the kit stack are a George Voss glass fuselage and laser cut rib set an original Mark s Models kit very nice wood selection and one of the Dave Thornburg hand cut kits from the original run of about 80 that he kitted in 1979 I wouldn t change much except to use a 5 16 wing joiner I ve bent two of the 1 4 rods on winch launches Andy Andy Page and His Bird of Time By Andy Page lt andypage37 hotmail com gt y Bird of Time wingspan is 118 and weighs 54 oz I built itin 2002 from the RCM plans which show the original fuselage structure with the nose block captured between the fuselage sides Modifications were the built up rudder plans show solid 014 007 carbon on the inboard panel spar caps spoilers direct driven with HS81s overkill and two forward dowels for wing hold down rubber bands rather than just one on the centerline The fuselage is glass over wood and is painted with Top Flight paint to match the Monokote The skeg was added in 2005 Itis a plywood core with shaped balsa cheeks embedded into the 1 2 fuselage bo
30. has the best description of the several features shown in the photo If that weren t great enough the battery lasts 20 hours or more Lee Tom Nagel My contributions to the Christmas wish list Fat lot of good it will do me Last year the wife got me an electric park flyer that she bought at Bed Bath and Beyond and the instructions were in Mongolian or something It had a nice battery but otherwise was pretty useless 1 Multiplex Easy Glider and I d settle for either the sailplane 79 99 or the electric version 89 99 2 Graupner s 30 automatic LiPoly charger Looks to be an inexpensive way to get into LiPoly batteries 3 SLK Electronics 40 LiPoDapter which AMA s Bob Aberle says will safely convert my peak charger to a LiPoly charger 48 Upper JR Synthesized Transmitter Module Part JRPTXMS Lower JR 10 Channel Dual Conversion Synthesized Receiver Part JRPR2000 49 Mark Nankivil There are a few items out there that have been a staple of my Christmas gifts over the years as my stepfather is a retired sailplane pilot having flown the Glasfl gel Mosquito and Schempp Hirth Ventus which he owned at different times As he has also been a member of the Soaring Society of America I am a happy recipient of their beautiful Soaring calendar every Christmas The Soaring Society of America also carries a varied selection of other merchandise that may appeal to you as well There are a number o
31. have it a well designed plane that flies well in all but light lift corners but has a greater overall stability Slope Flying At Cape Cod this October the Batgot its first real taste of slope soaring action Nervously I threw the Batin very heavy winds and low light There werea few reasons for my apprehension the wind was very powerful it was almost dusk the Bat had never been flown off a slope before and the dunes were almost two hundred feet tall thereby guaranteeing a long hike if I lost control The wind was moving at thirty plus m p h a little heavy for any foam plane Still and all I was able to keep it aloft and get a taste for the way that it handles I say a taste because I was afraid of losing the plane before I really got to fully test it so I landed and hoped for wind the next day The next day we woke early to find the wind coming straight into the hill by our hotel the Seascape Motor Inn in Truro Massachusetts Wasting no time I grabbed the Batfor some early morning gliding The twitchiness was still there but the Bat performed beautifully exhibiting good found that Hitec hardware is durable and comparable to other big brands in value Initial Test Flying I first tested the Batusing a bungee launcher in a soccer bad a li souble at first because of the great speeds that occur during bungee launching I found that the Bat would flip violently when I attempted to bring her up i
32. hen one day this springI glanced away from the plane justas the GWS receiver bout a year and a half ago I won a door prize at Terry Nitsch s JR Indoor Electric Fly in a GWS Spitfire kit a little electric powered war bird The box said For Advanced Flyers I decided to build it anyway I had builta GWS Tiger Moth so I had previous experience with translating instructions from GWS speak into English My aileron flying experience was limited to flying wings however and I had absolutely no experience flying relatively fast little airplanes that actually had November 2005 done forthe day Itwould be easier to make that part stronger but then the next weakest thing would break I needed to design a way to let the wing pop off during hard landings After the first outing I had only three minor fixes in mind Some light colored decals on the bottom of the wings to help with orientation A little more lead in the nose to make the elevator less sensitive Redesign for the wing hold down system to make it just a little stronger It was about 15 minutes work and the Splatfire was ready for its next outing Well itis fall now and the west winds are picking up I think I ll have some fun with the Splatfire before it gets too cold to fly If you have the chance to pick up a GWS war bird sloper kit giveitashot If you havea beat up old GWS war bird or see one ata swap shop take shot at converting it t
33. icles on planks and plank airfoils for Aufwind the highly acclaimed German aeromodeling magazine AND he was willing to translate them into English for publication in RCSD Aufwind has given its approval so watch for Peter s articles in future issues Enjoy the Holidays and accept our best wishes for a great N Year That s all for now Time to build another sailplane R C Soaring Digest Managing Editors Publishers B Kuhlman Columnists Jay Decker Lee Murray Tom Nagel Mark Nankivil Steve Richman Dave Register Jerry Slates Gordy Stahl Gregory Vasgerdsian Contributors Dave Garwood Don Bailey Mark Drela Philip Randolph Kyle Saltzman Peter Wick Photographers Dave Garwood Dave Beardsley Mark Nankivil Gregory Vasgerdsian Contact rcsdigest themacisp net lt http www rcsoaringdigest com gt Yahoo group RCSoaringDigest R C Soaring Digest RCSD is a reader written monthly publication for the R C sailplane enthusiast and has been published since January 1984 It is dedicated to sharing technical and educational information All material contributed must be exclusive and original and not infringe upon the copyrights of others It is the policy of RCSD to provide accurate information Please let us know of any error that significantly affects the meaning of a story Because we encourage new ideas the content of each article is the opinion of the author and may not necessarily reflect those of RC
34. ing creative we ll always find some other way to mess things up 37 Even counting fancy mixes our radios only know one trick All they know how to do is to change the proportion of servo movement to stick movement When the stick hits its stops it can t tell the servo to move further so that does determine an endpoint Q Yeah right buddy The radios do more than proportion What about trim adjustments A Even servo centering and trim adjustments are just the transmitter fibbing about how much the stick is deflected On many transmitters the trim tabs mechanically rotate the stick potentiometers It s kind of like the butcher putting his thumb on the scale Q So if they re all rate adjustments and they all affect endpoints what s special about the one labeled endpoint adjustment A Dual rate exponential differential and trim tab adjustments are all aimed at functions such as ailerons They may affect more than one servo or not Endpoint and sub trim adjustments target individual servos That s the whole difference The good news about endpoint adjustments but trim mechanically first The good news is that endpoint adjustments work great Unless you don t have them or as Bill Kuhlman said Unless you re using a Y harness A Y harness is one step simpler than an electronic mixer Ignorance 101 A misnomer Function adjustments versus individual servo adjustments Flashback to the s
35. ion on Hitec radio gear is available at lt www hitecrcd com gt R C Soaring Digest wingtips and attach them with velcro for a sleeker more grown up appearance My final complaint is that the design of the Bat combined with its weight made for difficult one handed launching There material because it comes in large rolls that you cut to shape yourself Vertical Stabilizers From an aesthetic standpoint I also have to admit that I disliked The Bat isa well designed plane that flies well in all but light lift was no really good place to firmly hold the plane it was awkward and difficult to throw Aside from these very easily modifiable issues I found that the Bathas everything that I would want in a simple yet high performance slope soaring wing the vertical stabilizers on the Bat These consist of these funky little batfeet that simply slide onto two rods that come out from the central part of the trailing edge of the plane To me they are ugly and childish in appearance One plan I have is to move these stabilizers to the Controllinkages The control linkages are made of cheap molded plastic which will break at any given opportunity leaving the pilot with little recourse unless they are prepared with extra components It is my advice to get higher quality parts from a hobby store and use those from the start Covering material The covering materials also fell way short of the quality mark for
36. lope I fly more but give up on the flaperons That s my second mistake I could have adjusted endpoints on the spot with my JR 388S But I was carrying a false assumption Okay I ve been playing with these toys for a few years and I got fooled for the whole time I figured endpoint adjustment meant endpoint adjustment How dumb I figured endpoint adjustment was a limiter I figured that if I set the endpoint adjustment at say fifty percent it would move as before till the transmitter stick was about half way over and then it would stop even if I pushed the stick further Wrong Well I had a hint because endpoint adjustment is also called travel adjust in my JR 388S manual Not enough of a clue for me My manual says offers precise servo control deflection in either direction of operation Pretty vague as in meaningless marketing hype Endpoint adjustment does affect endpoints But it does so in the same manner as dual rates exponential and differential affect endpoints They are all rate adjustments Technically they adjust the proportion of servo movement signal to transmitter stick movement That s why our radios are called proportional control December 2005 artatthe time it was designed I often hear people talking about modifying the Bird of Time changing the dihedral enlarging the rudder etc Well it doesn t need it It handles beautifully just as designed I was care
37. n acrylic paint to make some epoxy spackle to fill up the cracks in the fuselage It worked pretty well The postal scale at work showed that the Splatfire now weighed 12 ounces pretty much what the GWS manual said a Spitfire sloper should weigh Wing loading was down from about 10 ounces per square foot to 7 8 ounces per square foot The Splatfire used to feel like a doorstop Now it felt like a sailplane We d see My first chance came mid week while I was recovering from April 15 I played hooky for a couple of hours and drove over to Newark to take advantage ofa GWS makes slope versions of many of their models but I get the impression they don t sell many kits that way I have never seen any on the shelf This would be a great chance to experiment On one occasionI had flown the powered version in light slope lift cheating with the motor as necessary Maybe without the drag of a prop and landing gear it would be a decent sloper Itis amazing what you can do with epoxy rubber bands and clothes pins Two nights later the Splatfire was back together I found the old four cell 250 mah nicads from the Zagi THL and popped them into the nose where the electric motor had been I clipped off the landing gear both main and tail wheel I glued the motor mount back together and used it to hold the prop shaft in place so I had a place to mount the spinner As an electric prop plane the Splatfire had been in dire n
38. nding contests and the like You can find more on these items at lt http www horizonhobby com gt Dremel has recently come out witha Lithium Ion powered cordless rotary tool which looks like it would be useful both in the workshop and at the field for those unplanned repairs You can find out more about this tool at lt http www dremel com HTML home_fr html gt A 12 disk sander would also be useful tool in my workshop and the Delta Machinery 12 inch Disc Sander with Integral Dust Collection Model 31 120 looks to fit the bill You can find these at Home Depot and other local hardware and home remodeling centers I want to wish for all of you the happiest of times this Holiday season and throughout the coming New Year Be sure to take pleasure in this great sport hobby of ours and may you have the chance to share it with others throughout the New Year and beyond Good Health and Good Lift in 06 Mark 50 If you re looking for a very small lightweight five channel receiver you owe it to yourself to investigate the SPF 5 RXO by Mikro Designs Mikro Designs is owned and operated by Don McGlauflin You may remember Don as the innovator who came up with the Sirius SmartCharge and Sirius Smartlest The 5 22 5 RXO while not dual conversion it exceeds AMA requirements and has proven itself to bea solid performer with exceptional resistance to interference and a range of over one mile on the ground Itis digi
39. nto the air After a few tries it became apparent that I simply needed to apply less movement on the control stick of the radio Once I eased up on the stick I was able to guide the Batin fast graceful arcs after the release of the bungee I attribute this instability to the lack of a swept wing design The Bathas less stability than other planes because it has a relatively short tip to tail length This is analogous to the wheelbase design on a motorcycle a very short wheelbase results in an agile and flickable bike with less stability at speed while a longer wheelbase is more difficult to steer in tight December 2005 2 field Conclusion Despite the aforementioned problems the Batby Windrider Aviation is a great slope plane The kitis easy to build inexpensive and durable all qualities desirable in a foam glider Windrider has perfected the simple do it yourself kit Ona scale of one to ten I would rate the Batat eight the only thing taking away from a perfect score being the finishing materials covering and control linkages My Bat flies excellently though and I am quite pleased with the plane as a whole If you ask me whether I would purchase this kit the answer is a resounding yes For more information on the Batand other Windrider kits see their website at lt www windrider com hk gt or the US importers at ww w atlantahobby com and www californiasailplanes com Informat
40. o a sloper Cheap fun R C Soaring Digest warm day and 20 m p h winds from the southwest The Splatfire flew pretty well from the very start I had felt that I had the CG a little further back than it had been as a power plane and indeed the elevator was very sensitive I dialed it back to 40 on dual rates The Splatfire is fairly fast I had a Cavasos Boomerang along for comparison purposes an all EPP 48 flying wing The GWS seemed faster though a little less floaty The Spitfire seemed to fly better with rudder and Itried to remember to keep the rudder aileron coupling on I didn t get around to any aerobatics on the first trip The lighting conditions made ita little tough to keep orientation I need to add some light colored decals on the bottom of the wings The all foam GWS fuselage seemed up to handling slope landings The new lighter weight probably helped in that regard too A rough landing after several flights popped the metal nut out of its plastic socket in the wing hold down system and I had no glue with me so I was items in place Even so as a sloper with the small 4 cell battery no motor and no landing gear the Splatfire was suddenly 4 8 ounces lighter The CG was pretty near the same It was kind of ugly but people expect that of slopers in general and my planes in particular I experimented with mixing a batch of 5 minute epoxy with some balsa filler compound and a shot of gree
41. ou can also download real time weather from the internet and use it within X Plane simulations 40 aircraft are included on the DVD including the Hindenburg Cessna 172 Bell 206 helicopter the B 2 Spirit and SR 71 Blackbird the SH Cirrus and the V 22 Osprey But you re not limited to the included aircraft You can download a large number of aircraft files created by other X Plane enthusiasts or create your own aircraft files for either existing aircraft or fictional designs X Plane reads in the geometric shape of any aircraft including the airfoil and control surfaces then figures out how that aircraft will fly Yes X Plane can handle tailless aircraft You can also create your own instrument panels December 2005
42. own trim 0 5 degrees as a preset for the launch by Peter Wick the pitching moment curve should be as flatas possible even with flaps the pitching moment should be around zero not for the PW75 and the PW1211 which have a somewhat more positive cm so that the plank is flying at high speeds without flap deflection and with minimal drag All other angles of attack need flap deflections These airfoils were originally designed for 20 flap chord but in reality there was not a big difference for flap chords between 20 and 3076 The hinge should be on the underside PWS1 mainly made for slope flying and aerobatics I made itin 2003 and is somewhat still my main design Itis made for planks as all the others but the lift range is extended to below zero for aerobatics and a lot of fun Itis well proven 180km hr in DS and was able to win the Danish championship in pylon racing Pitching moment is around zero PW106 mainly for more thermal oriented slope flying and PW98 mod more sophisticated slope flying more accurate building required wrote a series of articles about the design of flying planks for the German Aufwind magazine My PW airfoils are very well proven and there are a couple of commercially available airplanes on the market which are equipped with these airfoils Some comments on the airfoils They are made for planks but because of their pitching moment of around zero they will al
43. perior to using the elevon mixing in his transmitter but he swears it s better Plane carried mixers electronic allow elevon control with just 35 The Tests Up to 1 3 difference in travel Back home I set up a crude test jig to test the throws of seven HS 81MG and two HS 85MG servos One after another I plug each servo into the same channel of a JR nine channel receiver I switch on transmitter and receiver so the servo centers snap on a long servo arm as close to vertical as possible trim it to the line on my jig and mark how many degrees it travels when I throw the spoiler stick all the way No none of the servos hit their stops The good news The two HS 85MGs were only a degree different The bad news The HS 81MGs ranged from 53 degrees to 39 degrees of throw That s roughly 4 3 Wow HS 81 responses 39 40 43 44 48 51 and 53 degrees m flying a 60 carbon winged plane up on Saddle Mountain with Chris Ericson s Wild Arsed Mountain Slopers CEWAMS I don t realize I ve made a mistake I ve trusted my HS 81 Metal Gear flaperon servos to be identical Why not They look the same But this means I haven t set my endpoints And that s partly because I still have some confusion about endpoints I m having a good time bringing the plane well behind the ridge and then penetrating across sage to lift But I decide to land Low and just behind the ridge I lower the flaps I have them on the spoiler
44. ptember business took me to Las Vegas The Internet made it easy for me to locate a soaring club near the city that could accommodate my desire to fly with the safety of a licensed instructor or pilot on board I showed up about 10 AM on the cloudless day and had visions of the thermals popping up and supporting a long flight I learned that due to the date September 25 was later in the season than when I had done this before and the wind direction we would be scratching for lift The Las Vegas Valley Soaring Association web page lt www lvvsa org gt was well organized I contacted an instructor by e mail I m partial to Grob 103s so two 23 m going to wander from my regular topic to expound on the comment at the end of my last article about my visit to a sailplane port in Nevada A decade ago I decided that I loved flying RC sailplanes so much that I wanted to learn to fly the real thing Getting my sailplane license didn t seem like a good idea since I would have to drive about 80 miles to the nearest glider port or arrange for a week or so at a glider camp and then be looking at long drives each weekend when I wanted to fly Waiting until retirement seemed the right choice In the mean time I resolved to fly sailplanes when travel took me to an area with a glider port with instructors and I could include a weekend in my travel The best full size flying experience I had so far was in 2001 when Imade my third vi
45. r Jer Lee Murray This summer I invested in the RAM 2 Altimeter Data logger from Randy Brust at Soaring Circuits lt http www soaringcircuits com gt The unit sells for just under 100 and can be powered from a single Li Poly cell or from your receiver 5 or 6 cell pack It comes with a receiver plug that powers the altimeter when your receiver is on It doesn t matter how many times you turn your receiver off Every time you turn it on it goes into a new flight log The receiver can be adjusted to keep nine hours The Sombra Shadow 3 a compact lightweight seven channel crystal less receiver The lower photo shows the channel programming module in use 46 the speed for a little altitude and used a little lift over the field to land at my feet While the plot makes a good story the real value is in your knowing how high your launches are how long your flights were and how good you are at finding lift and avoiding sink The second item is a useful safety prize I chose Asa reward for our many years of not having a lost time accident every employee got to pick a prize Although there were about ten prizes to choose from 9576 of the employees chose a Ray O Vac Head Lite This LED based light provides a small illuminator that goes on your head to project a bright beam of light just where you have your head pointing You probably remember those times when repairing something Ray O Vac s LED Head Lite 47
46. sit to Sky Sailing at Warner Springs Ranch California in San Diego County The wife and I were celebrating our 35 anniversary so we stayed the weekend at Warner Springs Ranch Resort and combined it with a glider flight duet I launched first with a young enthusiastic commercial pilot we found a thermal and climbed several thousand feet and then my wife launched with her instructor to fly together My house and office are adorned with pictures of that memorable event If you want to hear more about that you might check the RCSD column on the subject RCSD V18 9 Sep 2001 pgs 1 November 2005 There were a few delays having do with the equipment While RC glider clubs have winch line breaks retriever problems and bird nest tangles they had the battery go dead in the Pawnee tow plane and some brake repairs that had to be made on this day himself I offered to help and got to learn more about assembling the full size glider like plugging in the wings connecting the control linkage mounting the stab and even taping the joints just the way we do with our models Jim even used the same white vinyl tape that I do You can see Jim s pride and joy in my photos Y A h go SD e k E Because of some other commitments Bill was busy checking pilots out giving pre paid SSA rides and being the flight operations officer so I had some time to walk around and actually become useful Jim
47. so have some application for swept wings In my opinion the design of airfoils can not be seen independent of the design for the airframe therefore some remarks which should act as a guideline for airplane designs with those airfoils All the airfoils are made for slope flying also DS F3F and so on apart from the PW 1211 which is designed fora SAL plank flying wing but for the design of the whole aircraft the aircraft should be designed the same way This means to me low drag at cj 0 and a high 0173 for sharp turning and aerobatics or thermalling with the PW1211 Coordinate files for all of these PW sections can be downloaded from www b2streamlines com PWairfoils html 39 December 2005 it 0 00552 0 00525 0 00498 0 00472 0 00447 0 00422 0 00398 0 00375 0 00353 0 00331 0 00310 0 00290 0 00271 0 00252 0 00234 0 00217 0 00201 0 00186 0 00171 0 00157 0 00144 0 00132 0 00121 0 00110 0 00100 0 00091 0 00083 0 00076 0 00070 0 00064 0 00060 0 00056 0 00053 0 00050 0 00048 0 00047 0 00047 D 0 92140 0 92560 0 92969 0 93367 0 93754 0 94131 0 94496 0 94851 0 95194 0 95526 0 95847 0 96156 0 96454 0 96740 0 97015 0 97277 0 97528 0 97768 0 97995 0 98210 0 98413 0 98605 0 98784 0 98951 0 99105 0 99248 0 99378 0 99496 0 99602 0 99695 0 99776 0 99844 0 99900 0 99944 0 99975 0 99994 1 00000 R C Soaring Digest 0 018
48. stick to slow things down The plane immediately spirals Its nose impales soft dirt narrowly missing rock I pretty quickly figure out that the left flaperon moves quite a bit farther than the right Twenty percent more Enough to puta plane into a roll Bother December 2005 Philip s servo test stand The servo to be tested is hooked up to a receiver and actuated through the transmitter function The protractor attachment gives a direct reading of servo throw This test bench allows matching of servos or use of transmitter endpoint adjustments to artificially match them before they re in an airplane Note Yoda is not necessary but his presence does add a certain ambience to the proceedings R C Soaring Digest two channels one ofthem elevator which stops one from adjusting left surfaces independently from right surfaces Similarly pilots with very basic radios won t have endpoint adjustments The danger and an explanation with a partial prevention So WARNING If you don t have a radio with endpoint or travel adjustments which are actually rate adjustments check your servos for similar throw before you stick them in your wings Elevon servos of mismatched response could make a flying wing roll upon elevator input Flaperon flap or spoileron servos of unequal response can make a standard planform roll just when one is close to the ground trying to land Bad Sherman continued You re prob
49. tally programmable for use with any FM transmitter brand has five fully proportional channels can be programmed so AUX can be either channel 5 or 6 and has built in Elevon Mixing capability The SPF 5 RXO can be used with lithium batteries All this in a package just 1 00 by 0 65 by 0 40 Oh yeah it weighs just four grams with the GWS crystal The price for this work of art is just 43 95 Watch for a complete review in an upcoming issue of RCSD Mikro Designs also puts out the same receiver with a 20 Amp ESC for 10 more Be sure to check out other Mikro Designs items when you visit their web site at lt http www mikrodesigns com gt B2 51 Right Mikro Designs SPF 5 RXO receiver As a result of this comprehensive programming X Plane is being used by aircraft manufacturers to test conceptual designs before finalization Being able to fly the Space Shuttle or maneuver an aircraft in the Mars atmosphere while attractive did not materially sway our purchasing decision Rather the final decision to purchase was made when we visited the X Plane web site lt http www x plane com gt and saw thatit was temporarily on sale reduced from 50 to 39 One caveat before purchasing make sure your current computer will handle the intense graphics demands made by X Plane and your computer can read DVD formatted data disks Left The X Plane flight simulator DVD world itself for that matter from the DVD Y
50. ttom faired with epoxy microballoons and glassed over with heavy cloth I felt the extra work was worth it to avoid having to tape one onto the nicely finished fuselage This makes it much more manageable in contest landings in case itis carrying a bit too much speed It nearly eliminates any chance ofa groundloop I love this sailplane The performance is amazing considering the state of the D Fi ri JD has WT 7 38 R C Soaring Digest Peter Wick Airfoils for Plank Planforms These are both modifications of the They have higher camber and therefore a higher On the other hand the cl range does not extend to negative cj so aerobatics is negatively affected But for a DS model the PW98 mod looks very promising Both airfoils should thermal very well Pitching moment is about the same as for the PW51 PW75 mainly made for slope flying and aerobatics with more positive The PW75 isa modified PW51 with some more reflex This gives a higher pitching moment so planks will fly with a cj about 0 4 with no flap deflections This airfoil is well proven and seems to work fine both on the slope and on the flat field in thermals PW1211 made especially for a SAL plank project The PW1211 was only published on the German forum rclines because there was a special need for a SAL flying wing plank The c is a bit positive and the airfoil will therefore need a tiny bit of d
51. tubes to stiffen the wing three rolls of colored packing tape for the outer finish a decorative sticker and a bag of small parts and hardware mentioned in the article Photo by Kyle Saltzman insatiable appetite for balancing weight I didn t have everything balanced properly until I had crammed approximately ten ounces of lead into the front of the plane making fora very heavy wing B C Soaring Digest booklet are instructions for the wing taping diagram Balancing Once taped the plane needs to be balanced This was a tricky part for me as the Bat had an foam in the cracks to secure everything and to prevent any movement within the guts of the plane Once everything is laid out the wing halves are securely taped together with the strapping tape In the Construction Building this plane is very easy Into the pre cut holes in the wing halves go the radio components servos battery pack receiver and connecting wires I stuffed some extra 30 31 Thewing tapingdiagram forthetop ofthe Windrider Aviation Bat Photo by Kyle Saltzman Thewing tapingdiagram forthe belly ofthe Bat Numbers 4 and 5 are servo hatches 6 and 7 are the receiver and battery pack hatches Photo by Kyle Saltzman December 2005 Kyle test flying the Bat using a bungee launch Because ofthe high speed ofthe launch over controlling was easy Easing up on the stick made a big difference OK off to the slope Photo by D
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