June 2005 MHW - Audacity Models
Contents
1. discovered the Indent on the 10 mm main rotor shaft just like Raptor 30 50 This is a good idea because the setscrews will not damage the 10 mm diameter portion of the shaft TT 50H is just as powerful and user friendly as the OS 50SX H think the TT 50H is not getting a fair shake because the first TT helicopter engine the TT 36H from 10 years ago developed a poor reputation for lousy throttle transition from idle to mid range The new TT 50H is a completely new engine with a different carburettor and uses a ringed piston making it easier to start than ABC designs The TT Pro 50H mounting dimension crankshaft thread size and exhaust hole pattern are identical to OS 50H The Tiger 50 requires using a propeller drive washer between the engine and the fan hub take a look at the picture Unfortunately the OS 50 Hyper the TT 50H Webra 50H and Weston UK 50H do not include a drive washer with the engine and only come with a 2 mm thin washer for the crankshaft Luckily have some left over drive washers and placed the 2 mm washer between the engine front bearing and the drive washer The hole in the Tiger 50 fan hub is slightly tight and requires slight reaming to fit on the crankshaft The instructions suggest after installing the fan hub to check the run out of the fan hub with a dial indicator checked it and mine was out by 0 010 inch A Dremel Mototool was used to elongate the hole in the fan hub and then manoeuvre the f2. so we used a half pound 2400 mAh NiCd battery to bring the CG under the main shaft Without fuel the model weighed 7 pounds 6 ounces which is heavier than the Raptor 50 and on par with the Venture 50 or Sceadu Evo 50 The ball links fit perfectly on the balls no sizing required however they fit tightly on 2 3 mm threaded rods used a ball link tool to make them easier to turn Drive Train The design of this helicopter is straightforward and it is clear the designer was trying to come up with a rugged utility helicopter and not going for some revolutionary new model The end result is a user friendly and easy to service helicopter The engine can drop out the bottom without removing the landing gear but you must first remove the muffler and carburettor The fan shroud does not cover the engine heat sink head but the fan shroud intake hole has been enlarged so the Tiger 50 does not have overheating problems The engine mount accepts the standard OS 50 SX H size engines and not 46 class engines the Ornith uses a smaller 46 size engine mount that have a narrower crankcase The price of 50 size engines have come down quite a bit and are far easier to tune than some 46 size engines and make more power suggest using a 50 size engine instead of a 46 size engine am using a TT 50H engine because it is 30 to 40 less expensive than an OS 50 and in the last few years after using many different TT 50H and OS 50SX H engines
3. servo arm to compensate Using intermediate bellcranks provide three advantages 1 permits a push pull set up 2 allows using the bellcrank geometry to amplify control throw and 3 blade loads feeding back through the swashplate will be partially absorbed by the bellcrank support system Of course there is no free lunch and as a result there are disadvantages too These are increased complexity weight and cost For a 50 class beater helicopter such as the Tiger 50 the designer made the right choice by selecting simple light and cheap for connecting servos to the swashplate a further benefit is it s simple to build and set up All five servos are mounted directly on two moulded plastic side frames The frames are quite sturdy maybe too sturdy Even with a few more lightening holes they should still be plenty strong A Futaba GY 401 GY 240 and CSM 200 gyro were tested on this model the GY 401 has the highest price and the CSM is the least expensive Interestingly their performances ended up exactly like their price the GY 401 performed the best and could lock the tail solidly even in 40 mph backward flight while 74 MHW June 2005 The Korean company that makes the robbe Ornith produces the Tiger 50 But the Tiger 50 features many changes requested by Audacity Models so it is an enhanced and newer model the inexpensive CSM 200 would blow out in high speed backward flight and would not hold a constant s
4. then the horizontal fin does not need to be removed Tal Boom Suppo Chama pper Tai Room Support ciare Lowel ptem Sodai T The stock paddle has a hole in the leading edge for inserting lead weight Only total beginners should use the lead weight because even without the lead the helicopter is very stable and the cyclics are not fast enough for aggressive 3 D Need to buy lighter paddles and a threaded 3 mm flybar to speed up cyclic for 3 D flying The model uses 6 mm hex starting system which Throttle linkage shown here The engine can be easily removed from underneath the helicopter remove the muffler and the carburettor first a result engine cooling is an area that received Audacity s close scrutiny An examination of the side frame reveals subtle changes some are downstream of the head and do not really affect cooling but add a bit of strength instead Look just above the forward landing gear boss to see where a lightening hole has been blocked off A side by side comparison of photos from the Oct 2003 Ornith review and pictures here of the cooling shroud demonstrates how the Tiger 50 side frame extends a bit further past the head So it seems the crew at Audacity Models didn t miss a trick in their search for improvements before releasing the Tiger 50 Further changes to the side frame area are to the snap in servo bosses When in place these innovative little bits provide for adjustment amongs
5. 48 with provisions for adjustable Bell Hiller ratios The revised seesaw features two Bell Hiller ratios instead of one novice and intermediate pilots will leave the ball in the outer position resulting in a 1 1 100 Bell Hiller ratio Pilots seeking to practice 3 D manoeuvres will prefer the faster 0 7 1 70 Bell Hiller ratio Experienced modellers know a flybar functions like a mechanical rate gyro to help stabilise helicopters pitching and rolling motions When a numerically lower ratio flybar tilts there is less main blade pitch angle change so reducing Bell Hiller mixing ratios are similar to lowering the gain setting on a gyroscope The frugal amongst us will undoubtedly think simply drilling new holes in an Ornith seesaw accomplishes the same thing That s true but don t do it because as with the main blade grips the new seesaw also has higher glass fibre content and there are moulded in reinforcing bosses as well These greatly increase the strength where the ball screws in There are other helicopters on the market that permit pilots to choose different Bell Hiller mixing ratios to suit varying flying requirements High end helicopters like the X Cell and Fury models manufactured by Miniature Aircraft use different length steel ball studs on the Bell Hiller mixing arm attached to the blade grip Hirobo s Freya and Evo as well as Thunder Tiger s Raptor 90 are similar to the Tiger 50 because they use additiona
6. 5 100 which give 10 5 to 10 5 collective pitch You can use the exact same values Novices should inhibit the Idle Up feature to prevent accidentally activating it eCCPM and Servo Set Up The Tiger 50 helicopter side frame design and 120 eCCPM layout are similar in concept and layout to the XeroG Model Product s CCPM Raptor 50 conversion kit as reviewed by in February 2005 MHW Except the Tiger frames are plastic and the XeroG frames are carbon however the Tiger 50 is much cheaper The 3 eCCPM servos on the Tiger 50 are located very close to the swashplate so the control linkage set up could not be simpler the two servo arms should each be approximately 20 mm long while the forward servo should use a 23 mm arm to compensate for the 15 reduction in the linkage to clear the start shaft With such a long servo arm 20 mm it is almost a must to use servos with zero backlash in the gear train Personally think it is better to use a non digital servo that has zero backlash than to use a cheap digital servo with freeplay in the gear train Three Hitec HS 635 analog servos are used because they are inexpensive only 40 in the US and have Hitec s new Karbonite resin gears James showed me these servos because he found they have zero The entire main rotor head including the seesaw and flybar control ring is similar to the Hirobo Shuttle As described in the text install the longer ball studs on the swashplate inner ring t
7. 50 can become a 3 D trainer As mentioned the Tiger 50 is a very adjustable helicopter This is important because it permits the pilot to tune the Tiger to their preferred style of flight Let s examine the changes that resulted to the Tiger 50 control Tiger 50 The engine servos and all bearings are embedded on two moulded side frames Very convenient but if any area of the frame is cracked after a crash the entire mechanics must be taken apart and rebuilt All 3 eCCPM servos mount directly to the plastic side frame Fore aft cyclic servo on the front and two roll servo beneath the main shaft Notice the pulley and pinion for the belt drive tail rotor system Conventional floating axle main rotor and straight forward 120 electronic CCPM control system with direct pushrod link between roll servos and swashplate The main gear drives the pinion and pulley for the belt drive tail rotor CSM 200 gyro tested here June 2005 MHW 71 Feature Two plastic mounting plates are used for each servo the Tiger 50 comes with improved back plates that will not slide sub system that make it so readily adjustable For example to tame the model down a beginner may add the supplied lead rod to the leading edge of the hollow flybar paddles and perhaps move the ball in one hole on the washout arms The 3 D maven will wish to go in the opposite direction The Audacious crew s R amp D also developed a different seesaw AH 05
8. Feature Tiger 50 An in depth look at Audacity Models Tiger 50 words Tom Scully photos Tom Scully and James Wang ello everyone I ve done a lot of travelling since last time and am glad to be back and flying again This month we look at a 50 class helicopter newly presented to the market by Audacity Models and it is called the Tiger 50 Regulars will recall Richard Morris reviewed the robbe Ornith in the October 2003 MHW and may think it looks familiar but as it turns out the Tiger 50 offers many improvements Though the same company also OEMs the Tiger 50 they do so to Audacity s specifications and what results is as distinct as Stevenson s Dr Jekyll from Mr Hyde In short while the Ornith is a mellow and stable helicopter with which to perform basic loop and roll manoeuvres Audacity fed the Tiger 50 some more testosterone While it can be tamed for beginners in the hands of 3 D pilots the Tiger 50 can perform Death Spirals Tick Tocks and Pirouetting Flips etc Audacity Models Genesis Hobby Distributor is based near Disney World in Orlando Florida in the USA They are the exclusive distributor The Tiger 50 is available in kit form or in ARF almost ready to fly as shown here 70 MHW June 2005 for the Americas Canada USA Mexico and South America as well as the UK South Africa Australia and New Zealand Audacity s crew on the other hand seem to be modellers first and businessmen second They la
9. an hub until the dial indicator registers less than 0 002 inch run out was even able to get it down to less than 0 002 inch but only after 40 minutes of repeatedly tightening loosening and adjusting the fan hub position A trick to help with this is to use a dab of anti seize when assembling the clutch hub to the engine Novices may not have a dial indicator at home so suggest either borrowing one or do the best you can manually by placing a short piece of music wire near the fan hub and watch the gap between the stick tip and the fan hub while rotating the fun hub by hand Dial indicators are less than 50 and are a worthwhile tool in your arsenal Audacity announced there is an optional clutch hub AH 0537 available for engines not supplied with a prop drive washer where the aluminium hub portion is taller replacing the drive washer Audacity Models offer an inexpensive muffler PRO 0068 that fits the Tiger 50 perfectly and the Evo 50 and even the Raptor IG TED E LSD Optional limited slip unit for autorotation The aluminium collar presses the O ring against the autorotation hub so when the main rotor shaft spins during autorotation it will drive the main gear and thus the tail rotor 50 This cast muffler has two chambers to reduce noise is held together with a very long 3 mm through bolt A 3 mm nut is used at the end to hold the two cast aluminium pieces together adding an extra 3 mm nut will help gua
10. ecals that are super thin but super sticky so you have only one chance However the Tiger 50 decals do not go around the sharp curves of the nose There is a trick however to putting on the decals use a heat gun and gently warm up both the decals and canopy while pushing down on the decals at Tiger 50 _ Do not push the engine too far up so the clutch rubs against the clutch bell Here we can see pushed the clutch too far up and the clutch bell was wearing the top surface of the clutch This is true for many helicopters suggest adding a 6 mm i d shim washer on the starting shaft between the clutch and the clutch bell Bottom view of the Tiger 50 rotor head We can see the Bell Hiller mixing arm attached to the 70 ratio location closer to the centre of the main rotor shaft The Ornith Seesaw and Bell Hiller arm add some Loctite on the bushing and the 3 mm bolt will eliminate all freeplay learned this trick from the Raptor 90 instruction manual The Tiger 50 seesaw has more fibre content than the Ornith and also has two sets of holes for two different Bell Hiller mixing ratios 100 and 70 June 2005 MHW 75 Feature Tail rotor pitch control bellcrank is the only bellcrank that is not supported by ball bearings all other mixing arms and control arms are supported by ball bearings and there are not that many bellcranks the same time This softens the decals a little and helps them go around c
11. han that of average novice modellers and in fact Prototype electric Tiger 50 does not have an engine start shaft so the front servo can be located beneath the swashplate The aluminium side frames are for testing only eventually plastic frames will be made The model will use 600 mm blades and similar in size and weight as the Logo 20 No word on when the electric version will be out Tiger 50 mechanics note the exposed engine heat sink head the workmanship is more on par with what would be expected from a careful helicopter modeler with 3 to 5 years experience Whoever built these ARF models spends every day doing it and is obviously quite expert as their methodology and assembly skill are consistent After 40 flights on one Tiger 50 nothing has loosened up A nice touch is the Tiger 50 features 3 mm Allen head bolts throughout instead of cheaper crosshead Phillips screws This is a definite plus with me because they don t slip as easily as the Phillips do and prefer Allen head bolts everywhere For example on my Freya 60 replaced the four crosshead bolts that clamp the tail boom with four 3 mm Allen bolts Long ago also invested in a good quality set of hardened tip Allen drivers with handles Unlike L shaped Allen wrenches the hardened tip Allen drivers are less likely to round out the hex socket of an Allen head bolts Tiger Detail Like many of you we have occasionally furrowed our brow wondering what helic
12. ic roll cyclic and The 120 eCCPM makes control hook up very easy The model should be very light because of fewer parts Tail rotor control servo mounts directly to the plastic side frame A Z bend in the tail control pushrod is required to clear the frame June 2005 MHW 73 Feature The fan hub must rest on a prop thrust washer Unfortunately newer helicopter engines such as the OS 50 Hyper head TT 50H Webra 50H and Weston 50H no longer include a prop thrust washer had many thrust washers lying around from my aeroplane days Audacity offers an optional AH 0537 clutch hub that has a longer stem thereby eliminates the need for a thrust washer Maybe Audacity can include a thrust washer in each kit collective Set them all to 75 which is enough to give maximum swashplate tilt and provide 20 of collective travel when 20 mm long servo arms are used for all three eCCPM Servos We do wish to point out that while expensive high performance helicopters like the 90 size Fury Vigor and Acrobat also use 120 eCCPM they use intermediate T style bellcranks between each of the three servos and the swashplate To keep the Tiger 50 simple a very short pushrod connects the two aft servos directly to the swashplate The forward swashplate servo employs a 90 bellcrank because the engine start coupler interferes with placing a servo under the swashplate this bellcrank gives a 15 reduction in throw hence the use of a 23 mm
13. l pivoting position for the Bell Hiller mixing arm to vary the Bell Hiller mixing ratio This is advantageous because the arm can be easily moved at the field without need for additional parts The ball placement at the inner ring of the swashplate also affects the control feel of the model The Tiger 50 includes two 12 mm x 2 mm bolts and two 3 mm x 2 mm i d bushings for moving two of the control balls on the swashplate further out On the inner ring of the swashplate there are four control balls The two balls that are further out are connected to the 72 MHW June 2005 j z j F p is similar to many popular helicopters Futaba GY 240 GY 401 and CSM 200 gyros were tried see text for result Mount the gyro on the front to alleviate tail heaviness washout arms The two balls that are closer in are connected via long pushrods to the Bell Hiller mixing arms Adding the bushings move these two balls further out resulting in a longer lever giving greater main rotor blade angle change as the swashplate tilts this is Bell command which is often just what a 3 D pilot is seeking Moving on to the frame Audacity soon discovered that what works quite well in chilly Nova Scotia will be utterly inadequate during the sweltering summers of Texas or Florida As The plastic clamp for the tail boom supports and for mounting the horizontal fin It would have been even better if the two 3 mm bolt for the clamp were tightened from below
14. le in the right side frame Pulling the fuel line forward shuts off the fuel flow This built in feature eliminates the need for a fuel shut off valve All plastic framed helicopters should have such a feature yy q already assembled While I took 30 minutes to add the landing gear plug in the tail boom slip the belt over the pulley and then bolt on the tail boom steadies and fins this included time looking over the manual Next installed the fan and clutch to the engine bolted it to the engine mount and after a quick session with the dial indicator slipped it into the model Installing the servos adding balls to the servo arms and sub trimming the servos didn t take long was pleasantly surprised to discover the heavy duty prefabricated 2 3 mm diameter pushrods with ball links installed at both ends instead of Z bends at the servos resulted in my being ready to program the model very quickly By the time trimmed the canopy and added the decals had spent perhaps 8 hours but this included time for making notes The kit takes more like 20 hours to complete Balance the cost versus the pleasure and make your choice You may be interested in knowing went through each and every bolt of my ARF with an Allen driver and confirmed they were all tight even removed the two setscrews securing the tail rotor hub onto the tail output shaft to confirm thread locker was used in the factory assembly The ARF workmanship is better t
15. n days instead of hours As they explained production pieces will be lighter when made of plastic though not as hot looking Looks like we will foresee interesting developments from the folks at Audacity Models E Specification PRODUCT Tiger 50 MARKETPLACE 50 size beginner sport US IMPORTER DISTRIBUTOR Audacity Models PO Box 952765 Lake Mary FL 32795 USA Tel 407 302 3361 Fax 407 302 3363 MAIN ROTOR DIAMETER 1235 mm TAIL ROTOR DIAMETER max 245 mm OVERALL LENGTH 1150 mm ALL UP WEIGHT without blades 3 345 g 7 Ib 6 oz STANDARD MAIN GEAR RATIO 8 9 1 STANDARD TAIL GEAR RATIO 1 5 2 CONTROL REQUIREMENTS 5 servo heli radio and gyro POWER REQUIREMENT 50 cu in 2 stroke model helicopter engine CURRENT US RRP ARTF Tiger 50 299 99 plus P amp P Tiger 50 kit 284 99 plus P amp P These two pictures explain what 70 Bell Hiller mean Set the main rotor blade pitch to zero degree and level the flybar Then tilt the flybar 10 in either direction If the main rotor blade pitch angle changes by 7 then it means the Bell Hiller mixing ration is 70 See text for more explanation
16. o maximise the swashplate output for 3 D so the flybar control ring almost touches the bottom of the blade grip as shown here freeplay and at 4 8 volts has a travel speed of 0 18 second 60 degrees and 69 in oz of torque These inexpensive servos are good for even up to 60 size sport helicopters If a little more gusto is needed then the other excellent value choice is the HS 5475 which is a digital version of the HS 635 with Karbonite gears is US 45 and has 0 23 second travel speed and 61 in oz torque which is great for 30 and 50 size machines For the tail rotor James showed me a new Hitec HS 6965 that he has been using with the Futaba GY 401 gyro and JR 500 gyro The HS 6965 is almost as fast as the Futaba tail servo but has almost twice the torque of either the Futaba 9253 or Futaba 9254 and will work with any gyro except the Futaba GY 601 that uses a non standard pulse width The easiest way to set up an eCCPM helicopter is to do it on the workbench with Idle Up turned on and leave the throttle collective stick in the centre position Mount the servo arms on the spline output shaft so the arms are as close to perpendicular to the servo case as possible You may need to use the transmitter Sub trim feature to fine tune the servo arm position JR Futaba Airtronics Sanwa and Hitec radios all have 120 eCCPM mode and in the swashplate mode menu permit choosing the travel throw for the three control actions fore aft cycl
17. odern 50 size helicopter engines Additionally add the optional lightweight 3 D paddles and a shorter 3 mm flybar from Audacity Models will really speed up the cyclic response and make it ready for rock and roll The fore aft servo cannot be below the swashplate because the engine starting shaft is in the way a 90 swing arm is used to connect the front eCCPM servo to the swashplate The main rotor hub is similar to the Hirobo Shuttle a plastic hub is used in conjunction with a metal centre post A 5 mm spindle is used and each blade grip has two radial bearings and one thrust bearing The Shuttle rubber damper with 5 mm i d will fit the Tiger 50 The optional lightweight 3 D paddles have two mounting holes Using the hole near the leading edge gives more controllable 3 D and using the hole toward the trailing edge makes the response more snappy and should be reserved for the crazy 3 D pilots Finally maximise the swashplate tilt mechanically and you re ready to 3 D The 5 point throttle curve values use for Normal mode are 0 28 55 78 100 The 5 point pitch curve values for Normal mode are 15 35 60 78 100 These values are suitable for novice and advanced sport pilots The Tiger hovers best at 1550 to 1600 rpm Ask a friend to use an optical tach to check the rotor speed for you The 5 point throttle curve values use for Idle Up mode are 100 75 70 80 100 The 5 point pitch curve values for Idle Up mode are 0 25 50 7
18. opter manual writers had in mind so as usual we first turned to the Tiger s manual It is quite obvious the Tiger 50 manual has been authored in English and is both fairly detailed and includes many nifty Pro Tips Native speakers of the Queen s English will have no difficulties Noteworthy changes from an Ornith are found in the areas of the tail the head cyclic controls side frames and the power train Seemingly the whole thing has been revised Examples of changes in the model abound let s begin with the tail Audacity Models specified a larger and beefier steel tail rotor hub AH 0520 that is 2 mm larger in OD than that found on the Ornith This isn t a big deal unless a model spits the whole thing off which of course requires a successful autorotation to prevent destruction To encompass new longer 600 mm main rotor blades AH 1519 the tail boom AH 1518 is longer as is the tail drive belt AH 0508 Another modification to increase the speed of the tail rotor results in a different front tail belt pulley AH 0502 assembly Let s move to the head Unnoticed by the naked eye the main rotor grips AH 0546 have a higher glass fibre content that increases their strength and keep them from prematurely wallowing out from hard use Furthermore and in keeping with the spirited nature of the class of manoeuvres Audacity anticipate Tiger pilots will subject their models to thrust bearings AH 1506 are
19. pin rate in Piro Flips as always you get what you pay for Pilots wishing to practice 3 D manoeuvres will find the GY 401 with the HS 6965 servo is great value the GY 240 and CSM 200 are inexpensive heading hold gyros and adequate for beginners A good place to mount the gyro is to double sided tape it on top of the forward eCCPM servo The new high end CSM 560 mini gyro will also fit nicely but did not try it because only have the old CSM 560 which is too big to fit there Assembly Tips The Tiger 50 is supplied with four tail pushrod supports We had better results using three as it makes it easier to line up the tail pushrod for a straight shot at the linkage A small Z bend is still needed about three inches ahead of the tail rotor servo otherwise the pushrod will scrape the side frame Pay attention that the tail pushrod must not touch the aluminium tail boom support or the nut and bolt for the tail boom support because metal to metal contact may cause a radio glitch v i a o amp s i we a ms Inside the inexpensive muffler it fits the Tiger 50 without cutting the canopy A Dremel Mototool with carbide cutting wheel was used fo bevel the intake port to make the exhaust flow smoother The instruction recommends checking the fan hub trueness with a dial indicator had to elongate the fan hub hole slightly to bring the runout down to 002 inch The Tiger 50 ended up slightly tail heavy
20. pinion matched to an 89 tooth ring gear resulting in a 9 89 gear ratio Tiger 50 Receiver switch is attached to the side frame directly and two rubber grommets are used to isolate the switch from engine induced vibrations on the side frames suited to a 30 class helicopter while the Tiger has a 10 tooth pinion results in the 8 9 1 gear ratio more suited to the significantly greater torque of a 50 class engine In total 18 individual substantive changes to the tail head cyclic controls frames and drive train result in the Tiger 50 being a completely different animal and definitely worth a look 3 D Flight Set Up For intermediates pilots wishing to use the Tiger to practice 3 D then the following steps should be performed Move the ball to the inner hole of the seesaw 70 Bell Hiller mixing ratio Add the small bushings to move two short swashplate control balls of the inner ring of the swashplate further out as described previously Use 80 Durometer rubber dampers because they make the rotor system feel more rigid and responsive Run the main rotor speed at 1850 to 1900 rpm because for 3 D flying it is a must to use high rotor speed and harder rubber dampers as otherwise cyclic performance is slower and the main rotor blades may actually hit the tail boom in Pirouetting Flips Plus when the main rotor is at 1850 rpm the 8 9 to 1 gear ratio puts the engine at 16 465 rpm which is perfectly at the power peak for most m
21. r 50 flybar control ring and seesaw with mounting holes for two different Bell Hiller ratios 76 MHW June 2005 some 5 mm i d shims between the grips and the dampers to further stiffen things up to forestall striking the tail boom during high G 3 D manoeuvres like my Tiger 50 for practicing new manoeuvres because it is a lot less intimidating less stressful and inexpensive in the eventuality make an error The replacement parts are extremely inexpensive tail booms are a mere 7 88 main shafts just 6 94 600 mm wood blades are 27 99 etc so people can fly this helicopter with less apprehension The Tiger 50 has no handling vices and the very reasonable cost really makes it excellent for both 3 D practice and sport flying Novices can dial down the responsiveness while they learn to hover by adding the supplied weights to the flybar paddles and then adjust for more responsive performance later After all novices are not learning to hover forever and what s especially nice is everyone can enjoy the rush of the 90 class power to weight ratio the 50 class engine delivers while benefiting from the 30 class price Last thing it seems Audacity have their finger firmly on the pulse of the future as demonstrated by the sneak peak exclusive to MHW This is a prototype electric version of the Tiger We were excited of the prospects of CNC aluminium frames but they quickly dashed hopes with mention of mill time measured i
22. rantee the first nut does not come loose Amazingly this muffler is not only reasonably quiet but works much better than expected The exhaust hole diameter was enlarged by 1 5 mm with a large drill bit and that helped raised the engine power output with a slight penalty in noise Be careful not to crack the exhaust tube when drilling out the exhaust tube Tail Rotor The tail rotor system uses a Canadian manufactured black neoprene toothed belt During the first few flights check the belt tension after every flight because the belt will warm up and stretch as it wears in then readjust the tail boom for proper tension The horizontal fin clamp uses separate bolts and not the two bolts for the fin to clamp down on the tail boom This is a wonderful idea but it will be even better if the two bolts are inserted from below the tail boom then you do not have to disturb the horizontal fin when we want to pull on the tail boom Canopy The edges on the canopy came precut which is a time saver so only had to cut the window and add the windshield The opening on the bottom of the canopy is big enough to fit a Pocket NiStarter for the glow plug so a remote glow plug extension is not needed This is a plus because extensions seem to fail at the most inopportune time Use a new X Acto knife to cut the decals wash the canopy with dishwashing detergent and then wipe dry These decals are easy to move around not like the Hirobo d
23. specified The Tiger 50 blade spindle diameter is 5 mm which is the same as the Hirobo Shuttle and Raptor 30 50 V1 while the Evo 30 50 and Raptor 30 50 V2 use 6 mm spindles However Audacity maintains the 5 mm spindle will reduce collateral damage from a crash the 5 mm spindle will be the sacrificial part instead of the rotor head parts There is merit in this because at 5 92 US hobby store cost the spindle shaft is very inexpensive however an optional 6 mm spindle kit AH 0516 is available Furthermore while both the Ornith and the Tiger 50 use 70 Durometer rubber dampers for main rotor blade spindle restraint to provide tighter control In addition there are optional bright yellow urethane 80 durometer harder dampers AH 0518 available This makes it very easy to fine tune the model to your liking The Tiger 50 hovers and feels very smooth in flight almost like an FAl type helicopter and its tamed nature makes it well suited for novices but to make it a wild 3 D ship requires different adjustments and will detail these next It s unusual to find these adjustable Capabilities in one machine much less at a price point encroaching on 30 class helicopters The sports set up configuration leads one to great confidence in circuit flying because like a fixed wing pattern aeroplane in fast forward flight the Tiger 50 tracks very true i e without a strong pitch up tendency Make a few field adjustments and the Tiger
24. t varying servo dimensions Audacity insisted on yet another seemingly minor design change the newly revised servo boss set AH 1512 preserves the critical brass eyelet to prevent over compression of the servo rubber vibration isolator while simultaneously preventing movement of the servos under load Yet another change to the Tiger 50 frame is a new longer radio platform AH 0530 This is due to the Ornith 30 class heritage that when stretched to accommodate a 50 class engine s power needs a longer boom to accommodate the longer blades Naturally the longer platform facilitates a more forward placement of equipment to assist balance and thus help compensate for the longer tail boom Speaking of the increased power of a 50 Audacity quickly found that while the Ornith clutch was adequate for a 30 class engine or even an inexpensive 46 it simply couldn t cut the mustard when stressed by a more potent 50 class engine All Tiger 50s comes with a larger engine mount AH 0534 to accept the OS 50SX TT Pro 50H or Weston 50H The kit also includes a larger clutch AH 0538 as well a larger clutch bell assembly AH 0526 and new lining AH 1510 There s also a new pinion gear AH 0526 too Physically the clutch and the clutch bell diameter are larger and as a quick visual reference the Tiger 50 clutch bell assembly does not have holes machined in it The gear ratio is better suited to a powerful 50 the Ornith has a 9 tooth
25. ughed when asked why the Tiger 50 wasn t released sooner and said We really abused the Tiger 50 and also destroyed several beyond repair Then we d fix it and fly it some more Audacity says rather than rush to market they subjected the Tiger 50 to a rigorous and intensive R amp D effort and have been flying the stink out of it just to see what breaks for more than a year This process resulted in somewhat extensive though occasionally subtle changes and they go far beyond merely re christening it the Tiger 50 and making a new decal set Ultimately found the Tiger 50 well suited for 3 D pilots searching for a beater with which to practice manoeuvres before risking their more expensive helicopter Tiger 50 Description purchased the ARF version 299 99 in the USA primarily to save building time and it arrived in 30 x 16 x 10 box After getting to know my Tiger 50 subsequently purchased a kit version 284 99 which arrived in a slightly more compact 30 x 16 x 8 box The Tiger 50 is a fun helicopter repair parts are inexpensive and the design is so simple that repairs are easy This encourages me to attempt more manoeuvres which suspect is what Audacity had in mind all along Out of the box the mainframe and main rotor head are assembled as a unit The tail rotor and tail boom are also an assembled unit Even the landing gear is Minimal parts count Notice the fuel line comes out though a keyho
26. urves and also helps melt the glue making them stick even better Flying The Tiger 50 is very stable and well suited as a sport helicopter What like best is it exhibits no pitch up tendency in high speed forward flight The canopy profile is bigger than other 30 and 50 size helicopters so it can more easily be seen from a distance The excellent visibility and high stability makes it a good machine to learn forward flight With the supplied symmetrical weighted 600 mm wood blades the helicopter climbs very fast right side up or upside down Switch to a pair of Thunder Tiger 600 mm carbon blades or V Blades 600 mm carbon blades and the Tiger 50 becomes even better Audacity offers an optional Limited Slip clutch for the autorotation hub It is an O ring design that creates friction between the main rotor shaft and the main gear hence driving the tail rotor during autorotation The slipper clutch is fine for 180 autos but not really sufficient for high speed backward autos Audacity Models says an optional driven gear system is under consideration In any case do not view this as a liability as 50 class helicopters do not typically have the reserve of blade energy that 60 90 class models do already mentioned how to set up the Tiger 50 for 3 D flying It is capable of Pirouetting Flips Death Spirals and Tick Tocks Just make sure to install harder dampers and perhaps This rendering clearly shows the design of the Tige
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