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88 inch YAK-54 ARF

Instruction Manual

©Copyright 2007 Extreme Flight RC, Ltd.

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Содержание YAK-54 ARF

Страница 1: ...88 inch YAK 54 ARF Instruction Manual Copyright 2007 Extreme Flight RC Ltd ...

Страница 2: ...s in order to be properly insured and to operate your model at AMA sanctioned flying fields only If you are not willing to accept ALL liability for the use of this product please return it to the place of purchase immediately Extreme Flight RC Ltd guarantees this kit to be free of defects in materials and workmanship for a period of 90 days from the date of purchase All warranty claims must be acc...

Страница 3: ...or the current makes of 50 60cc engines Also included is a set of protective wing and stab bags and a canopy hatch cover to keep your investment looking great season after season The performance ability of the Extreme Flight RC Yak 54 is phenomenal With its low weight and enormous control surfaces the Yak 54 is a 3D monster capable of all current 3D maneuvers as well as possessing the ability to f...

Страница 4: ...autiful paint like finish is attainable The black covering may require a little bit more attention than other colors due to its tendency to absorb heat 3 By the time the Yak arrives at your door step it will have been handled by a lot of people Occasionally there are small dings or imperfections on some of the surfaces A neat trick to restore these imperfections to original condition is to use a v...

Страница 5: ...ll as high quality heavy duty ball links titanium turnbuckle pushrods and composite control horns and a carbon fiber tailwheel assembly You will also find 3 white ball links 2 of these are for use with the included 2mm pushrod for the throttle assembly this set up is for the DA 50 other engines may require a longer pushrod the other is for the bottom of the rudder to retain the tailwheel tiller ar...

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Страница 7: ... Locate the horizontal stabilizer elevator assemblies as well as the composite control horns and base pieces from the elevator hardware package 2 Use a sharp 11 blade to open the 2 slots near the bottom leading edge of the elevator 7 ...

Страница 8: ...til the base plate is flush with the control surface Use a fine tipped felt marker to trace the outline of the base plate onto the covering Remove the control horn assembly Use a sharp 11 hobby blade to remove the covering 1 16 inside the lines you drew Do not cut into an open bay area Make your cut only where there is sheeting below the covering 8 ...

Страница 9: ...ughly coated with epoxy Us an epoxy brush to thoroughly coat both sides of each control horn as well as the bottom of the base plate Use an abundance of glue here as any excess will be forced out of the slot when you insert the horns 5 Insert the horns and push them into the slots until they are seated flush with the base plate and the base plate is flush with the control surface Insert one of the...

Страница 10: ...d several adhesives you can use We will describe the way we do it as this method has proven itself over many years of model building If you are new to this type of hinging process then I recommend that you install a single hinge first just to acquaint yourself with this method Before starting the process get a few items together that will aid you as you proceed You will need the following items 30...

Страница 11: ...ess outlined above Be sure to wipe away all excess epoxy Set aside to dry Repeat this process for the other stab elevator half 9 After the hinges have dried thoroughly pull on them to make sure they are properly installed The hinges will probably feel a little stiff as it is almost impossible to get all of the glue out of the joint Use a fine tipped hypodermic needle and place one only one drop of...

Страница 12: ...d that you thin a small amount of epoxy with a few drops of alcohol and apply a light coat to the inside of the stab and to the servo mounting rib as well as to the root rib and mounting tabs Over time exhaust residue begins to collect here and by sealing it with epoxy you will prevent degradation of the wood 12 Use the manufacturer supplied mounting hardware and install the elevator servo with th...

Страница 13: ...m bolt Secure with a 3mm nylon insert locknut 14 Place the servo arm onto the servo which you should have electronically centered in a previous step and make sure the elevator is in the neutral position Adjust the ball links until the linkage fits between the composite control horns and lines up with the pre drilled top hole Insert a 3mm socket cap screw through one side of the composite control h...

Страница 14: ...his Repeat these steps for the other stab elevator half Before you set aside the stabs take a moment with your covering iron and go over all of the seams with a medium heat setting paying special attention to the ends of thin trim stripes At this point clean the 2 elevator stab assemblies with Windex and a soft cloth and put them away in their protective bag 14 ...

Страница 15: ... aileron from the wing panel Locate the 2 slots for the control horns and remove the covering from the slots with a sharp 11 blade Follow the same procedure as outlined previously to install the control horns into the control surface and hinge the wing You may need to trim 1 16 from the front of the composite base plate to prevent overhanging the bevel Repeat this procedure for the other wing 15 ...

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Страница 17: ... servo mount and remove the covering from this area Use a sealing iron to seal the edges of the covering to the sides of the servo opening Take a few minutes to apply some CA to the joints of the servo rails and the ribs 17 ...

Страница 18: ...urer supplied mounting hardware and install the servo with the output shaft toward the leading edge of the wing 19 Electronically center your servo We will fabricate the linkage much in the same way as the elevator linkage Aileron control horn length should be 1 50 As always use blue Loctite on ALL bolts 18 ...

Страница 19: ... If there are wrinkles in the covering on the leading edge sheeting use a heat gun with a 100 cotton t shirt to remove them and prevent digging into the wood with an iron Use caution and avoid excessive heat as you may cause the Ultracote to shrink too much and lift at the seams Also take the time to seal the hinge gaps with Ultracote or Blenderm tape Clean the wings with Windex and put them away ...

Страница 20: ...1 blade to remove the covering from the 2 pre cut slots in the rudder 22 Trial fit the 2 servo horns through the base plate and into their proper position flush against the rudder surface You will need to trim the front of the base plate so that it does not overhang the hinge line as shown in the photo 20 ...

Страница 21: ...itioning Use some denatured alcohol and a paper towel to remove any excess epoxy Re check the alignment one more time and set the assembly aside to dry Repeat for the other side of the rudder 24 Locate a 2mm ball link from the hardware bag Thread the 2 56 ball link onto a scrap piece of 2 56 pushrod Cut the pushrod using diagonal cutters leaving a 1 2 beyond the ball link Drill a 1 16 pilot hole i...

Страница 22: ...in the bottom rear of the fuselage to expose the 2 pre installed 3mm blind nuts Slide the tiller arm of the tailwheel into the hole in the ball link and attach the tailwheel assembly to the bottom of the fuselage with the 2 medium length 3mm bolts and washers Be sure to apply blue Loctite to ALL bolts Use the supplied wheel collar to retain the tailwheel 22 ...

Страница 23: ...lexibility of the gear allows it to give in rough landing situations This flexibility has proven itself valuable in our testing as we had a flame out and the Yak fell flat on its gear from about 12 feet The gear was bent but nothing was broken or damaged Insert the gear into the slot on the bottom of the fuselage and center it in the slot Use the pre drilled holes as guides and drill through the p...

Страница 24: ...28 Place a washer on one of the 4mm mounting bolts and insert them through the holes you just drilled from inside the fuselage 24 ...

Страница 25: ...n glue 31 Locate the 2 wheel spats and 2 plywood mounting plates Use sandpaper to scuff the inside of the spat for better glue adhesion Drill a hole as shown in each ply plate about below center This will allow the spat to be positioned slightly higher than center to prevent it from making contact with the ground 25 ...

Страница 26: ...ation of the hole in the plywood plate 33 Install your choice of axles and slide the spat over the axle and into position against the landing gear leg Position as desired and mark the location for the blind nut using the pre drilled hole in the aluminum gear as a guide Install the 4 40 blind nut and secure the spat with a 4 26 ...

Страница 27: ...40 bolt Use blue Loctite on ALL bolts Slide a wheel collar onto the axles followed by the wheel and finally another collar to retain the wheel You may need to trim the spat to clear the wheel 27 ...

Страница 28: ... manufacturers will provide a mounting template for their engines We have included the DA 50 template at the end of this manual Simply tape the template to the firewall and drill the mounting holes at the designated location Be sure to align the vertical line on the template with the thrust offset line the line to the right of the center line Shown below is the template for the Brillelli 366GT 60c...

Страница 29: ...36 Use the recommended mounting bolts to mount the engine to the firewall You will need to use standoffs to get the motor to 6 7 inches from the firewall to the engine thrust washer 29 ...

Страница 30: ...e carburetor on the DA 50 180 degrees so that the throttle arm is facing the bottom Please contact DA for the proper procedure It is very easy and only takes a couple of minutes Mount the servo in the hole in the floor of the engine box and use the 2mm pushrod and white ball links to fabricate the throttle linkage Very easy If you plan to use a tuned pipe you will need to install 3 8 hardwood serv...

Страница 31: ...bro 20 oz tank Make sure to use the gas conversion stopper and Tygon tubing for all plumbing Use nylon cable ties to secure the tank to the tank tray The tank should butt up against the partial former in front of the wing tube 31 ...

Страница 32: ...ot 40 Once all plumbing is completed and throttle servo and linkage is installed glue the top of the motor box in place with 30 minute epoxy This piece is NOT optional as it adds an enormous amount of strength and rigidity to the motor box 32 ...

Страница 33: ...to use a piece of silicon tubing between the pipe and mount to insulate the mount from the heat My pipe mount technique is very easy and involves very little hassle First cut a piece of 1 64 ply to fit the width of the pipe tunnel floor 2 inches wide Next cut a piece of 1 4 inch light ply into a 1 inch by 2 inch piece Drill a hole in the center of the 1 4 inch ply and mount the nylon mount to the ...

Страница 34: ...mount with a nylon cable tie Pictures are much better for this 34 ...

Страница 35: ...35 ...

Страница 36: ...36 ...

Страница 37: ...e hardware package Trial fit the tray to the mounting rails and mark the center on the rails and tray for easy alignment once glue is applied Apply 30 minute epoxy to the tray and clamp this assembly to the servo rails and allow to dry 37 ...

Страница 38: ... your rudder servo using the supplied hardware with the output shaft toward the front of the plane We recommend the use of one of the new mega torque standard size servos such as the Hitec HS 5955 or the JR 8611A or 8711 for this position 38 ...

Страница 39: ...exit slots at the rear of the fuselage as shown 46 Assemble one end of the linkage by inserting the pull pull cable into a crimp through the hole in the brass pull pull fitting and back through the crimp Loop the cable back through the crimp a second time and crimp with side cutters 39 ...

Страница 40: ...st in from of the slot Pull the cable forward into the canopy area and make up the same type of linkage as you did previously Secure the linkage at both ends with a 3mm bolt and nylon insert lock nut Repeat for the other side You will want to use a 4 inch arm for the pull pull system I highly recommend the 4 inch offset arm from SWB Manufacturing 40 ...

Страница 41: ...48 Here is where we installed our switches on each side of the fuselage After opening the hole with a new hobby blade we soaked the surrounding wood with thin CA before installing the switch 41 ...

Страница 42: ...from the circumference of the louver plate with a pair of scissors You will also want to open the louvers in front of the engine cylinder for adequate cooling Glue the louver plate in place from the rear with 30 minute epoxy Make sure to scuff the inside of the cowl and edges of the louver plate for better adhesion 42 ...

Страница 43: ...rom getting scuffed I also apply a strip of Blenderm across the bottom of the fuselage in the same location to prevent the cowl from chafing the Ultracote 51 Use a few pieces of masking tape to secure the cowl in place and view it from several angles to insure that you have it properly aligned Use a felt tipped marker to make alignment marks to insure you are drilling into the center of the mounti...

Страница 44: ...44 ...

Страница 45: ...vo extensions to the elevator servos If you plan to remove the stabs for transport you will need longer extensions Open the holes in the rear side of the fuselage to expose the pre mounted 3mm blind nuts You will also need to open a hole for the servo leads to pass through 45 ...

Страница 46: ...e stab halves onto the carbon fiber stab tube and secure with a 3mm bolt and washer inserted through the mounting tabs and into the pre mounted blind nuts Make sure to use a drop of blue Loctite on these bolts 46 ...

Страница 47: ... not to cross thread the bolts and inspect them periodically to insure thread integrity This completes the assembly of the 88 inch Yak As a final step I recommend you clean the entire aircraft with glass cleaner then apply a coat of spray on wax and buff the finish to a high gloss My favorite product for this is Eagle One Wet Wax AS U DRY available in the automotive section of most Wal Marts K mar...

Страница 48: ... your plane laterally Add a small amount of weight to the wingtip to achieve proper lateral balance As mentioned earlier if you are planning to use a tuned exhaust system you will need to mount all batteries as far forward as possible The tuned pipe adds several ounces behind the CG and great care must be taken to counter this without adding additional weight or as little as possible Control surfa...

Страница 49: ...rong points This incredible control authority allows you to start stop and change direction of roll instantly The Yak will obey your every command Another of my favorite maneuvers is one I have named The Aneurysm This maneuver is basically a medium speed tumble on 3D rates It is similar to a lomcevak and I have been able to get the Yak to tumble tail over nose 3 times on occasion This is a very st...

Страница 50: ...WHEN PRINTINGTHISTEMPLATE make sure under PAGE HANDLING that PAGE SCALING is set to NONE DA50 R Mounting Template ...

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