Manual 1
Contents
1. ssssesseeeeeeeeneen 11 GET THE MODEL READY TO FLY aaaea 12 Check the Control Directions ccceceeeeeneees 12 Set the Control Throws ccccceeeeeeeeeereeeeeteeeeeeeees 13 Balance the Model C G c cccceceeseseeseeeeeesteeeees 13 Balance the Model Laterally 0 eee ceeeeeseeeeeeenees 14 PREFLIGHT arastir e ran eaaa are araara AS Sarana onti 14 Identify Your MOdel cc ceeeeeeseeeeeeeneeeeeeeeenaeeeeeeenaes 14 Charge the BatterieS cccccceeeeeeeeeeeeeetteeeeeeeee 14 Balance Propellers cccccscceceeesseceeeeeeeeeeeeeeenenees 14 Range Check ccccccecceeeeseeeeeeeeeeeaaeseeneeeseaeeeeaeeeeaes 14 MOTOR SAFETY PRECAUTIONS eeeees 14 AMA SAFETY CODE 0 0 0 cccceeeeeeeeeeeeeeeeeeeeeeeeeees 14 CHECK LIST neegri a a aaa ae araa rnae ESE 15 FLYING ST N AE EE E A E 15 Hand Launch eere erer ea i back cover aea E EEE E E E E TE ateee back cover Landoi eel el back cover ID ta EE E sine back cover INTRODUCTION Whether you re just learning aerobatics or are a seasoned 3D veteran you ll enjoy the Yak 55 EP w FlightFlex This airplane combines the proven flight characteristics of the Yak 55 design in an inexpensive easy to operate electric powered model with an extremely resilient structure When your airplane is capable of bouncing back from unintended impacts with terra firma it s just that much easier to learn to do maneuvers like torqu2. flight will be successful If you value this model and wish to enjoy it for many flights DO NOT OVERLOOK THIS IMPORTANT PROCEDURE A model that is not properly balanced will be unstable and possibly unflyable At this stage the model should be in ready to fly condition with all of the systems in place including the engine landing gear covering and paint and the radio system 13 3 3 8 86mm 3 3 8 86mm LJ1 Usea felt tip pen or 1 8 83mm wide tape to accurately mark the C G on the top of the wing on both sides of the fuselage The C G is located 3 3 8 86mm back from the leading edge of the wing at the fuselage This is where your model should balance for the first flights Later you may wish to experiment by shifting the C G up to 1 2 138mm forward or 3 8 9mm back to change the flying characteristics Moving the C G forward may improve the smoothness and stability but the model may then require more speed for takeoff and make it more difficult to slow for landing Moving the C G aft makes the model more maneuverable but could also cause it to become too difficult to control In any case start at the recommended balance point and do not at any time balance the model outside the specified range J 2 With all parts of the model installed including the battery ready to fly lift it upside down on your fingertips at the balance point you marked I 3 If the tail dro
3. the slot at the rear of the fuselage Check the alignment using the sketch above as a reference Use a common pin to secure a length of string to the front center of the fuselage Adjust the position of the stab in the stab slot until the length of string is equal on both ends of the stab Be careful not to flex the fuselage as you make measurements L 2 When you are satisfied with the alignment of the stabilizer glue it in place with low temperature hot melt glue NEERA KELL We When gluing EPP parts together with hot melt glue you can use this technique to create a very strong bond if the parts form an angle between them F F r GLUE BEAD A M ye M GLUE FILLET FOAM FOAM Run a small bead in the corner between the two parts 7 Use the glue gun tip to re melt the glue bead causing it to penetrate into the joint and form into a fillet The gun tip will also slightly melt the foam allowing the glue to fuse with it somewhat forming a very strong joint B B _ 3 Slide the wing into the cutout in the fuselage Make sure the wing is centered and square in the fuselage and parallel with the stabilizer when viewed from the front Again be careful not to flex the fuselage as you make your measurements L 4 When you are satisfied with the alignment of the wing glue it in place with hot melt glue J 5 Use h
4. time altitude or airspeed Every maneuver should be deliberate not impulsive For example if you re going to do a loop check your altitude mind the wind direction anticipating rudder corrections that will be required to maintain heading remember to throttle back at the top and make certain you are on the desired rates high low rates A flight plan greatly reduces the chances of crashing your model just because of poor planning and impulsive moves Crashing Even though the Yak 55 3D EP ARF is a very durable airplane learning to crash properly will extend the life of your airplane Since this is a 3D airplane recoveries can happen in very little altitude so keep trying with power to recover until the last possible second you may find that you can fly out of a lot more crashes than you thought When you do know that impact is imminent cut your throttle plowing the propeller into the ground at full power will almost certainly strip out your spur gear Also try to avoid allowing the airplane to build up speed into a crash keep the nose up and the speed down and the airplane will take impact in almost any attitude Pound it into the ground fast on the nose however and you ll be gluing the nose section back on Have a ball But always stay in control and fly in a safe manner Cut out or photocopy the ID tag Fill in the information and place it in your model
5. 1 32 x 5 8 Carbon rudder pushrod 1 Gearbox screw 2 x 6mm 2 x 1 4 1 1 x 80mm 1 32 x 3 1 8 Carbon elevator pushrod 1 ORDERING REPLACEMENT PARTS Replacement parts for the Great Planes YAK 55 EP w FlightFlex are available using the order numbers in the Replacement Parts List that follows The fastest most economical service can be provided by your hobby dealer or mail order company To locate a hobby dealer visit the Hobbico web site at www hobbico com Choose Where to Buy at the bottom of the menu on the left side of the page Follow the instructions provided on the page to locate a U S Canadian or International dealer If a hobby shop is not available replacement parts may also be ordered from Tower Hobbies at www towerhobbies com or by calling toll free 800 637 6050 Parts may also be ordered directly from Hobby Services by calling 217 398 0007 or via facsimile at 217 398 7721 but full retail prices and shipping and handling charges will apply Illinois and Nevada residents will also be charged sales tax If ordering via fax include a Visa or MasterCard number and expiration date for payment Mail parts orders and payments by personal check to Hobby Services 3002 N Apollo Drive Suite 1 Champaign IL 61822 Be certain to specify the order number exactly as listed in the Replacement Parts List Payment by credit card or personal check only no C O D If additional assistance is required for any
6. It is required at all AMA R C club flying sites and AMA sanctioned flying events Charge the Batteries Follow the battery charging instructions that came with your radio control system to charge the batteries You should always charge your transmitter and airplane batteries the night before you go flying and at other times as recommended by the radio manufacturer CAUTION Unless the instructions that came with your radio system state differently the initial charge on new transmitter and receiver batteries should be done for 15 hours using the slow charger that came with the radio system This will condition the batteries so that the next charge may be done using the fast charger of your choice If the initial charge is done with a fast charger the batteries may not reach their full capacity and you may be flying with batteries that are only partially charged Balance Propellers Carefully balance your propeller and spare propellers before you fly An unbalanced prop can be the single most significant cause of vibration that can damage your model Vibration may also damage your radio receiver and battery We use a Top Flite Precision Magnetic Prop Balancer TOPQ5700 in the workshop and keep a Great Planes Fingertip Prop Balancer GPMQ5000 in our flight box 14 Ground check the operational range of your radio before the first flight of the day With the transmitter antenna collaps
7. WAK 55 3D EP with FlightFlex INSTRUCTION MANUAL Wingspan 33 5 in 850mm Wing Area 369 sq in 24 dm Weight 16 17 oz 455 480g Wing Loading 6 2 6 60z sq ft 19 20 g dm Length 36 5 in 925mm Radio 4 channel w 4 micro servos and 25A brushed ESC Power System Ball bearing 370 sized motor 5 1 reduction gearbox included WARRANTY Great Planes Model Manufacturing Co guarantees this kit to be free from defects in both material and workmanship at the date of purchase This warranty does not cover any component parts damaged by use or modification In no case shall Great Planes liability exceed the original cost of the purchased kit Further Great Planes reserves the right to change or modify this warranty without notice In that Great Planes has no control over the final assembly or material used for final assembly no liability shall be assumed nor accepted for any damage resulting from the use by the user of the final user assembled product By the act of using the user assembled product the user accepts all resulting liability If the buyer is not prepared to accept the liability associated with the use of this product the buyer is advised to return this kit immediately in new and unused condition to the place of purchase To make a warranty claim send the defective part or item to Hobby Services at the address below Hobby Services 3002 N Apollo Dr Suite 1 Champaign IL 61822 USA Include a letter s
8. and loop fastener into the battery compartment Stick the remaining loop side onto the battery pack The pack will sit on its side in the fuselage 12 _ 7 Secure the propeller to the prop saver using one of the included o rings _ 8 Install the receiver behind the battery using hook and loop fastener Run the antenna out the back of the zippered fuselage opening Use a pin to puncture two holes 1 2 12mm apart in the vertical fin Stick the receiver antenna through the holes as shown l 9 The ESC can be tucked into the front of the fuselage on either side of the battery GET THE MODEL READY TO FLY Check the Control Directions J 1 Turn on the transmitter and receiver and center the trims If necessary remove the servo arms from the servos and reposition them so they are centered Reinstall the screws that hold on the servo arms _ 2 With the transmitter and receiver still on check all the control surfaces to see if they are centered 4 CHANNEL RADIO SETUP STANDARD MODE 2 SS mE ELEVATOR MOVES UP RUDDER MOVES RIGHT FULL THROTTLE RIGHT AILERON MOVES UP K AILERON MOVES DOWN J 3 Make certain that the control surfaces and the motor respond in the correct direction as shown in the diagram If any of the controls respond in the wrong direction use the servo reversing in the transmitter to reverse the servos connected to those controls Be certain the
9. control surfaces have remained centered Adjust if necessary Set the Control Throws Use a ruler to accurately measure and set the control throw of each control surface as indicated in the chart that follows If your radio does not have dual rates we recommend setting the throws between the high and low rate setting NOTE The throws are measured at the widest part of the elevators rudder and ailerons These are the recommended conirol surface throws High Rate 3D Low Rate ELEVATOR 3 76mm up 1 1 2 19mm up 3 76mm down 1 1 2 19mm down RUDDER 4 1 2 114mm right 1 1 2 88mm right 4 1 2 114mm left 1 1 2 38mm left AILERONS 2 5 8 67mm up 2 51mm down 1 25 4mm up 7 8 22mm down Note High rates are 3D rates IMPORTANT The YAK 55 EP w FlightFlex has been extensively flown and tested to arrive at the throws at which it flies best Flying your model at these throws will provide you with the greatest chance for successful first flights If after you have become accustomed to the way the YAK 55 flies you would like to change the throws to suit your taste that is fine However too much control throw could make the model difficult to control so remember more is not always better Balance the Model CG More than any other factor the C G balance point can have the greatest effect on how a model flies and may determine whether or not your first
10. e allowed at or in the front of the flight line Intentional flying behind the flight line is prohibited 4 will operate my model using only radio control frequencies currently allowed by the Federal Communications Commission 5 I will not knowingly operate my model within three miles of any pre existing flying site except in accordance with the frequency sharing agreement listed in the complete AMA Safety Code 9 Under no circumstances may a pilot or other person touch a powered model in flight nor should any part of the model other than the landing gear intentionally touch the ground except while landing CHECK LIST During the last few moments of preparation your mind may be elsewhere anticipating the excitement of the first flight Because of this you may be more likely to overlook certain checks and procedures that should be performed before the model is flown To help avoid this a check list is provided to make sure these important areas are not overlooked Many are covered in the instruction manual so where appropriate refer to the manual for complete instructions Be sure to check the items off as they are completed l 1 Check the C G according to the measurements provided in the manual J 2 Be certain the battery and receiver are securely mounted in the fuse Simply stuffing them into place with foam rubber is not sufficient J 3 Extend your receiver antenna and make sure it has a strain relief inside
11. e rolls harriers high alpha rolls etc The EPP material that this Yak 55 is made of allows it to bounce back from most crashes just pick it up dust it off and launch it again Just because the airplane is capable of withstanding crashes doesn t mean it is completely indestructible however If you drive the airplane straight down into the ground at full throttle you will probably be making some repairs To minimize damage cut the throttle before impact if possible Take care to build straight and true as you complete the airplane Misaligned parts will hurt the airplane s ability to perform the extreme aerobatics it is designed for For the latest technical updates or manual corrections to the Yak 55 EP with FlightFlex visit the Great Planes web site at www greatplanes com Open the Airplanes link and then select the Yak 55 If there is new technical information or changes to this model a tech notice box will appear in the upper left corner of the page We urge you to join the AMA Academy of Model Aeronautics and a local R C club The AMA is the governing body of model aviation and membership is required to fly at AMA clubs Though joining the AMA provides many benefits one of the primary reasons to join is liability protection Coverage is not limited to flying at contests or on the club field It even applies to flying at public demonstrations and air shows Failure to comply with the Safety Code excerpts pri
12. ed and the receiver and transmitter on you should be able to walk at least 100 feet away from the model and still have control Have an assistant stand by your model and while you work the controls tell you what the control surfaces are doing Repeat this test with the motor running at various speeds with an assistant holding the model using hand signals to show you what is happening If the control surfaces do not respond correctly do not fly Find and correct the problem first Look for loose servo connections or broken wires corroded wires on old servo connectors poor solder joints in your battery pack or a defective cell or a damaged receiver crystal from a previous crash MOTOR SAFETY PRECAUTIONS Failure to follow these safety precautions may result in severe injury to yourself and others Keep your face and body as well as all spectators away from the plane of rotation of the propeller whenever the battery is connected Keep these items away from the prop loose clothing shirt sleeves ties scarfs long hair or loose objects such as pencils or screwdrivers that may fall out of shirt or jacket pockets into the prop AMA SAFETY CODE excerpts Read and abide by the following excerpts from the Academy of Model Aeronautics Safety Code For the complete Safety Code refer to Model Aviation magazine the AMA web site or the Code that came with your AMA license GENERAL 1 will not fly my model aircraft in sanct
13. eet included with the battery Failure to follow all instructions could cause permanent damage to the battery and its surroundings and cause bodily harm e ONLY use a LiPo approved charger NEVER use a NiCd NiMH peak charger e NEVER charge in excess of 4 20V per cell ONLY charge through the charge lead NEVER charge through the discharge lead e NEVER charge at currents greater than 1C e ALWAYS set charger s output volts to match battery volts e ALWAYS charge in a fireproof location e NEVER trickle charge e NEVER allow the battery temperature to exceed 150 F 65 C e NEVER disassemble or modify pack wiring in any way or puncture cells e NEVER discharge below 2 5V per cell e NEVER place on combustible materials or leave unattended during charge or discharge e ALWAYS KEEP OUT OF REACH OF CHILDREN ADDITIONAL ITEMS REQUIRED Radio Equipment and Electronics NOTE Recommended part numbers are included in parentheses I 4 channel radio minimum for maximum 3D performance a computer radio with mixing is recommended a 4 sub micro servos 0 3 oz 9g or less each FUTM0042 h Micro receiver FUTL0442 3 l Servo Y harness FUTM4130 a two 6 Servo extensions HCAM2000 L two 12 Servo extensions HCAM2100 J 25 amp brushed ESC GPMM2025 L 1250 1500mAh 3 series Lithium Polymer battery pack GPMP0823 GPMP0831 _ Lithium Polymer Charger Great Planes Tri
14. he YAK 55 has a very high thrust to weight ratio the plane will accelerate to flying speed almost instantly Climb to a comfortable altitude and throttle back to a lower power setting This plane flies great at about half throttle when in standard forward flight Flight For reassurance and to keep an eye on other traffic it is a good idea to have an assistant on the flight line with you Tell him to remind you to throttle back once the plane gets to a comfortable altitude While full throttle is usually desirable for takeoff most models fly more smoothly at reduced speeds Take it easy with the Great Planes Yak 55 for the first few flights gradually getting acquainted with it as you gain confidence Adjust the trims to maintain straight and level flight After flying around for a while and while still at a safe altitude with plenty of battery power remaining practice slow flight and execute practice landing approaches by reducing the throttle to see how the model handles at slower speeds Add power to see how the Yak 55 climbs as well Continue to fly around executing various maneuvers and making mental notes or having your assistant write them down of what trim or C G changes may be required to fine tune the model so it flies the way you like Mind your battery power but use this first flight to become familiar with your model before landing Landing To initiate a landing approach lower the throttle while on the dow
15. ioned events air shows or model flying demonstrations until it has been proven to be airworthy by having been previously successfully flight tested 2 will not fly my model aircraft higher than approximately 400 feet within 3 miles of an airport without notifying the airport operator will give right of way and avoid flying in the proximity of full scale aircraft Where necessary an observer shall be utilized to supervise flying to avoid having models fly in the proximity of full scale aircraft 3 Where established will abide by the safety rules for the flying site use and will not willfully and deliberately fly my models in a careless reckless and or dangerous manner 5 will not fly my model unless it is identified with my name and address or AMA number on or in the model Note This does not apply to models while being flown indoors 7 will not operate models with pyrotechnics any device that explodes burns or propels a projectile of any kind RADIO CONTROL 1 will have completed a successful radio equipment ground check before the first flight of a new or repaired model 2 will not fly my model aircraft in the presence of spectators until become a qualified flyer unless assisted by an experienced helper 3 At all flying sites a straight or curved line s must be established in front of which all flying takes place with the other side for spectators Only personnel involved with flying the aircraft ar
16. ll a control horn into the right side of the rudder using the same procedure I 12 Install control horns in the underside of the ailerons using the same procedure _ 13 If necessary remove the servo arms from all of your servos Find 4 long output arms with the spline size that fits your servos Press a plastic z bend clevis into the outer hole on each of these arms Trim the hole in the arm to ease the installation of the clevis J 14 Install the receiver and ESC into the fuselage Plug the servos into the receiver and temporarily install the battery into the fuselage Center all servos with your radio k 15 Attach the servo arm to the elevator servo pointing straight up Secure the arm with the screw included with the servo Slide a 3 1 8 X 1 32 80mm x 1mm carbon rod through the clevises on the servo and the control horn Adjust the linkage by sliding the rod in the clevises until you have the elevator straight when the servo is centered Once you are satisfied with the linkage secure it with a small drop of thin CA between the clevises and the rod Be very careful not to get CA in the pivoting joint between the horns and the clevises J 16 Set up the rudder linkage using the same technique k 17 Set up the aileron linkages using the same techniques In this case both servo arms should be installed perpendicular to the fuselage when the ailerons are in the neutral position This
17. nted in the back of the manual may endanger insurance coverage Additionally training programs and instructors are available at AMA club sites to help you get started the right way There are over 2 500 AMA chartered clubs across the country Contact the AMA at the address or toll free phone number below Academy of Model Aeronautics Ne 5151 East Memorial Drive SES Muncie IN 47302 9252 Tele 800 435 9262 Fax 765 741 0057 Or via the Internet at htto www modelaircraft org IMPORTANT Two of the most important things you can do to preserve the radio controlled aircraft hobby are to avoid flying near full scale aircraft and avoid flying near or over groups of people SINCE 1936 PROTECT YOUR MODEL YOURSELF amp OTHERS FOLLOW THESE IMPORTANT SAFETY PRECAUTIONS 1 Your YAK 55 should not be considered a toy but rather a sophisticated working model that functions very much like a full size airplane Because of its performance capabilities the YAK 55 if not assembled and operated correctly could possibly cause injury to yourself or spectators and damage to property 2 You must assemble the model according to the instructions Do not alter or modify the model as doing so may result in an unsafe or unflyable model In a few cases the instructions may differ slightly from the photos In those instances the written instructions should be considered as correct 3 You must take time to build straight true and
18. nwind leg Allow the nose of the model to pitch downward to gradually bleed off altitude Continue to lose altitude but maintain airspeed by keeping the nose down as you turn onto the crosswind leg Make your final turn toward the landing area into the wind keeping the nose down to This model belongs to Name Address City State Zip Phone number AMA number maintain airspeed and control Level the attitude when the model reaches an altitude of about 10 feet modulating the throttle as necessary to maintain your glide path and airspeed If you are going to overshoot smoothly advance the throttle always ready on the right rudder to counteract torque and climb out to make another attempt When you re ready to make your landing flare and the model is a foot or so off the deck cut your throttle and smoothly increase up elevator until it gently touches down on its belly Make sure that you cut your power completely before touchdown or gearbox damage may result One final note about flying your model have a goal or flight plan in mind for every flight This can be learning a new maneuver s improving a maneuver s you already know or learning how the model behaves in certain conditions such as on high or low rates This is not necessarily to improve your skills though it is never a bad idea but more importantly so you do not surprise yourself by impulsively attempting a maneuver and suddenly finding that you ve run out of
19. ot melt glue to secure four hinges in the precut slots in each aileron Do not worry about a little excess glue squeezing out onto the hinge pivots it is easily removed with a hobby knife after the glue hardens l 6 Test fit the ailerons to the wings If necessary enlarge the precut hinge slots with a hobby knife gt o we J 7 Glue the outermost hinge into the wing making sure to keep the hinge line parallel with the TE of the wing l 8 Using the flex of the aileron to allow you to glue one hinge in at a time work your way inward until all four hinges are glued in place 8 J 9 Use a hobby knife to clean any excess glue from the hinges l 10 Slide the 3mm 1 8 carbon elevator joiner tube into the plastic tubes on the stabilizer Make sure it is centered l 11 Run a small bead of hot melt glue into the groove on the leading edge of an elevator half Run the glue gun tip back through the bead to re melt and spread it and press the elevator half onto the joiner tube _ 12 Repeat the previous step with the other elevator half making sure to keep the elevator halves aligned with each other Set Up the Radio System I 1 Secure a 6 152mm extension to each of your aileron servos with tape or heat shrink tubing Use the strings in the wings to pull the leads through into the cockpit area l 2 Use hot melt glue to glue the servos into the
20. pe of adhesive works best for that step the instructions will make a recommendation Since this model is constructed from foam we recommend the use of foam safe CA glues and epoxy only Do not use standard CA glue on this model as it will dissolve the structure e Photos and sketches are placed before the step they refer to Frequently you can study photos in following steps to get another view of the same parts 100 110 120 130 140 150 160 170 180 KIT INSPECTION Before starting to build take an inventory of this kit to make sure it is complete and inspect the parts to make sure they are of acceptable quality If any parts are missing or are not of acceptable quality or if you need assistance with assembly contact Product Support When reporting defective or missing parts use the part names exactly as they are written in the Kit Contents list Great Planes Product Support 3002 N Apollo Drive Suite 1 Champaign IL 61822 Telephone 217 398 8970 ext 5 Fax 217 398 7721 E mail airsupport greatplanes com KIT CONTENTS o Sa es a ee Kit Contents Photographed 1 Fuselage 7 Rudder 2 Cowl 8 Hardware 3 Elevator joiner tube 9 Elevators 4 Propeller 10 Wing 5 Prop saver O ring 11 Right aileron 6 Motor Gear drive 12 Left aileron Kit Contents Not Photographed 1 x 130mm 1 32 x 5 Carbon aileron pushrods 2 Hook amp loop fasterner 1 1 x 15mm
21. ps the model is tail heavy and the battery pack and or receiver must be shifted forward or weight must be added to the nose to balance If the nose drops the model is nose heavy and the battery pack and or receiver must be shifted aft or weight must be added to the tail to balance If possible relocate the battery pack and receiver to minimize or eliminate any additional ballast required If additional weight is required begin by placing incrementally increasing amounts of weight on the bottom of the fuse until the model balances Once you have determined the amount of weight required it can be permanently attached IMPORTANT If you found it necessary to add any weight recheck the C G after the weight has been permanently installed Balance the Model Laterally Range Check LJ 1 With the wing level have an assistant help you lift the model by the motor propeller shaft and the bottom of the fuse under the TE of the fin Do this several times _ 2 If one wing always drops when you lift the model it means that side is heavy Balance the airplane by adding weight to the other wing tip An airplane that has been laterally balanced will track better in loops and other maneuvers PREFLIGHT Identify your Model No matter if you fly at an AMA sanctioned R C club site or if you fly somewhere on your own you should always have your name address telephone number and AMA number on or inside your model
22. reason contact Product Support by e mail at productsupport greatplanes com or by telephone at 217 398 8970 Because the Yak 55 is built as a one piece airframe there are no replacement airframe parts available Replacements for small parts are available REPLACEMENT PARTS LIST ORDER NUMBER DESCRIPTION HOW TO PURCHASE GPMG0215 0 ce eeeeeeseeeeeteeeeeneeeeees GEAR DRIVE Hobby Supplier GPMGO0860 REPLACEMENT SHAFT W SPUR GEAR Hobby Supplier GPMG0239 aeee rere PINION GEAR osen Hobby Supplier GPMG0311 aaaea REPLACEMENT MOTOR sn Hobby Supplier GPMA2786 ccceeeeceeeeteeeeeees 11 X 4 7 PROPELLER 0 eee Hobby Supplier GPMQ4620 0 00 eeeeeeeeteeeteeeeeeees PROP SAVER misein aia Hobby Supplier GPMA2785 0 eeeeeeeeeteeeeeteeeeeeees HARDWARE BAG osiin Hobby Supplier GPMG0216 ce MOTOR GEAR DRIVE ASSEMBLY Hobby Supplier GPMA2748 ee ceeeeeceeeeeceeeeeeeeteeeeeneeeeees COWL ao Bente ies Hobby Supplier GPMA2740 iinan naie aieas WING isesi hirian Hobby Supplier GPMA2741 eener FUSELAGE niaidne ien Hobby Supplier GPMA2742 iniii aiai tanii ai TAIL SET iinei aara Hobby Supplier Missing pieces Contact Product Support Instruction manual Contact Product Support Full size plans n i Not available BUILDING INSTRUCTIONS Assemble the Airframe CENTER A STRING 90 d grees I 1 Slide the horizontal stabilizer into
23. strong 4 You must use an R C radio system that is in first class condition with a correctly sized motor and components throughout the building process 5 You must correctly install all R C and other components so that the model operates correctly on the ground and in the air 6 You must check the operation of the model before every flight to insure that all equipment is operating and that the model has remained structurally sound Be sure to check clevises or other connectors often and replace them if they show any signs of wear or fatigue 7 If you are not an experienced pilot or have not flown this type of model before we recommend that you get the assistance of an experienced pilot in your R C club for your first flights If you re not a member of a club your local hobby shop has information about clubs in your area whose membership includes experienced pilots We as the kit manufacturer provide you with a top quality thoroughly tested kit and instructions but ultimately the quality and flyability of your finished model depends on how you build it therefore we cannot in any way guarantee the performance of your completed model and no representations are expressed or implied as to the performance or safety of your completed model Remember Take your time and follow the instructions to end up with a well built model that is straight and true LITHIUM BATTERY SAFETY WARNING Read the entire instruction sh
24. such as a wing or stab rapidly vibrates up and down thus causing the noise In extreme cases if not detected immediately flutter can actually cause the control surface to detach or the flying surface to fail thus causing loss of control followed by an impending crash The best thing to do when flutter is detected is to slow the model immediately by reducing power then land as soon as safely possible Identify which surface fluttered so the problem may be resolved by checking all the servo grommets for deterioration or signs of vibration Make certain all pushrod linkages are secure and free of play If it fluttered once under similar circumstances it will probably flutter again unless the problem is fixed Some things which can cause flutter are Excessive hinge gap Not mounting control horns solidly Poor fit of clevis pin in horn Side play of wire pushrods caused by large bends Excessive free play in servo gears Insecure servo mounting and one of the most prevalent causes of flutter Flying an over powered model at excessive speeds Hand Launch For the first flight it is a good idea to have a friend launch the airplane for you This allows you to keep your hands on the radio sticks and correct any trim problems that are present Have your friend hold the YAK 55 by the canopy Throttle up to full power and have your friend give the plane a gentle underhanded toss at about a 30 degree angle upward Since t
25. tating your name return shipping address as much contact information as possible daytime telephone number fax number e mail address a detailed description of the problem and a photocopy of the purchase receipt Upon receipt of the package the problem will be evaluated as quickly as possible READ THROUGH THIS MANUAL BEFORE STARTING Grea PLANS CONSTRUCTION IT CONTAINS IMPORTANT WARNINGS Cha nae AND INSTRUCTIONS CONCERNING THE ASSEMBLY gage ean 217 398 8970 Ext 5 airsupport greatplanes com AND USE OF THIS MODEL Copyright 2005 GPMZ0181 for GPMA1274 V1 0 TABLE OF CONTENTS INTRODUCTION 0 0 c0 ccccceceeeceeeececeeceeeeeaeeseeeeseeeeneeees 2 SAFETY PRECAUTIONS 0 ccecceeseeeeeeeeeeeteeeteees 3 ADDITIONAL ITEMS REQUIRED ceeeees 3 Radio EQuipMent e i E E E 3 Adhesives and Building Supplies c cceeeeee 4 Optional Supplies and Tools cccccsseeeeessssteeeees 4 COMMON ABBREVIATIONS csceetteeeeeees 4 IMPORTANT BUILDING NOTES 0 eee 4 KIT CONTENTS 00 ccceccecececeseeeeeeeeeeseeeeeeeeeeeeseeeeteneenieees 5 ORDERING REPLACEMENT PARTS 0 0008 6 BUILDING INSTRUCTIONS 00 00 cccecceeeeeeeeeeeeeeeeeees 7 Assemble the Airframe ccccceceeeeeeeeeeeeeeeeeeeeeeeeees 7 Set Up the Radio System cceeeeeeeeeeseeeeeeeneeees 9 Install the Propulsion System
26. the fuselage to keep tension off the solder joint inside the receiver d 4 Balance your model aterally as explained in the instructions l 5 Make sure all hinges are securely glued in place l 6 Confirm that all controls operate in the correct direction and the throws are set up according to the manual 15 l 7 Secure connections between servo wires and Y connectors or servo extensions and the connection between your battery pack and the on off switch with vinyl tape heat shrink tubing or special clips suitable for that purpose 8 Make sure any servo extension cords you may have used do not interfere with other systems servo arms pushrods etc _J 9 Balance your propeller and spare propellers 110 Place your name address AMA number and telephone number on or inside your model Ly 41 If you wish to photograph your model do so before your first flight Ly 12 Range check your radio when you get to the flying field FLYING The YAK 55 is a great flying model that flies smoothly and predictably The YAK 55 does not however possess the self recovery characteristics of a primary R C trainer and should be flown only by experienced R C pilots CAUTION THIS APPLIES TO ALL R C AIRPLANES If while flying you notice an alarming or unusual sound such as a low pitched buzz this may indicate control surface flutter Flutter occurs when a control surface such as an aileron or elevator or a flying surface
27. ton Charger GPMP3150 or Great Planes Polycharger GPMM3010 Adhesives and Building Supplies In addition to common household tools and hobby tools this is the short list of the most important items required to build the YAK 55 Great Planes Pro Foam Safe CA is recommended E Low temperature hot melt glue gun and glue WOOU1445 WOOU1446 L Hobby knife with 11 blade HCAR0105 L Thin Foam Safe CA GPMR6069 l Threadlocker cement GPMR6060 Optional Supplies and Tools Here is a list of optional tools mentioned in the manual that will help you build the Great Planes Yak 55 l Great Planes CG Machine GPMR2400 L Household string L Common straight pin COMMON ABBREVIATIONS Fuse Fuselage Fin Vertical Fin LE Leading Edge TE Trailing Edge LG Landing Gear Ply Plywood Stab Horizontal Stabilizer Inches SHCS Socket Head Cap Screw mm Millimeters To convert inches to millimeters multiply inches by 25 4 25 4mm 1 Inch Scale 0 1 0 10 20 30 40 Metric Scale 50 60 70 80 90 IMPORTANT BUILDING NOTES e When you see the term test fit in the instructions it means that you should first position the part on the assembly without using any glue then slightly modify or custom fitthe part as necessary for the best fit e Whenever the term glue is written you should rely upon your experience to decide what type of glue to use When a specific ty
28. will create a small amount of aileron differential d 18 Check that all of the servo arm screws are installed in the servos 11 Install the Propulsion System _ 1 Pull the ESC output wires forward from the canopy and out the hole in the firewall using the preinstalled string if necessary A l 2 Connect your ESC output wires to the motor If using a different ESC than the one recommended soldering may be necessary If soldering attach the wires to the same point that the capacitors and brush wires are pre soldered to The positive wire from the ESC connects to the identified red post Check for proper rotation before proceeding _ 3 Slide the gearbox assembly onto the motor stick Align the front of the gearbox 1 3 4 44mm from the firewall and secure it with a 2 x 6mm 2 x 1 4 wood screw I 4 Test fit the prop saver against the hub of the included propeller The proper fitting side faces forward when installed Slide the prop saver onto the gearbox output shaft Make sure that the screws seat down into the two flat spots on the shaft Secure the screws with threadlocking compound _ 5 Install the cowl onto the nose Secure it with 4 small drops of hot glue This will make it easy to remove if needed for motor maintenance or replacement l 6 Cut off a 1 piece of the hook and loop material used to install the receiver in step 8 Install the remaining hook side of the hook
29. wing cutouts with the output shafts forward _ 3 Secure 12 305mm extensions to your elevator and rudder servos using tape or heat shrink tubing Use the string in the fuselage to pull both servo leads into the cockpit area I 4 Glue the tail servos into the cutout in the fuselage with hot melt glue Both servos should have their output shafts toward the front of the airplane and the lower servo should project out the left side of the plane while the upper servo projects out the right side 9 _ 5 Cut a slot in the left elevator half in the location shown The front of the slot is just aft of the carbon tube The plane is shown here upside down J 6 Cut a slot in the rudder in the location shown The front of the slot is even with the start of the hinge bevel on the rudder p J 7 Cut a slot in each aileron in the location shown The front of the slots are even with the start of the hinge bevels on the ailerons J 8 Press a plastic z bend clevis into each of the four control horns Trim the inside of the hole in the control horn to ease the installation of the clevis it J 9 Glue a control horn into the underside of the elevator half Position the control horn as far forward as possible a d J 10 Secure the back side of the control horn with a control horn retainer Secure it with a small bead of glue 10 _J 11 Insta
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