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Summary of Contents for Extreme Flight YAK-55SP
- Page 1 YAK-55SP Profile ARF Instruction Manual ©Copyright 2008 EXTREME FLIGHT RC, Ltd.
- Page 2 Thank you for your purchase of the Extreme Flight RC Jeremy Chinn designed Matchless Yak-55SP profile ARF! We are honored to have worked with Jeremy on this project to deliver a very high performance, high quality product. Jeremy has been involved in prototype testing and we have listened to his suggestions and are very excited about the outcome.
- Page 3 Assembly 1. The first step is to use a sharp hobby knife to remove the covering from the wing slot, stab slot and servo openings in the rear of the fuselage as shown in the pictures.
- Page 4 2. Now let’s install the horizontal stab and elevator. First insert the stab into its slot in the rear of the fuselage. Use a ruler to assure the stab is centered and a square to make sure it is aligned 90 degrees to the fuselage. Sand or shim the slot as needed to insure proper alignment.
- Page 5 5. Slide the elevator through the stab slot oriented as in the picture, upside down with the counter balances pointing toward the rear of the fuselage. Once in the slot rotate the elevator into position. Now slide the stab into position. Re-check alignment and glue in place with 30 minute epoxy.
- Page 6 6. Locate the vertical fin and place it into the slot in the top rear of the fuselage. Check to make sure it is properly aligned to the fuselage sides and at 90 degrees to the horizontal stab, as well as flush with the rear of the fuselage. Sand or shim the slot as needed for proper alignment.
- Page 7 7. Locate the rudder, composite control horn and base, aluminum bracket, tailwheel wire, wheel and 2 collars. Remove the covering from the slot for the rudder control horn and insert the horn into the base and into the slot. Trace around the base with a fine tipped marker and remove the covering from this area.
- Page 8 10. Slide the rudder onto the hinges and into position and secure with thin CA. Be sure to leave enough gap to be able to get maximum deflection. 11. Secure the aluminum bracket to the bottom of the fuselage with 2 screws and tighten the collar against the bracket.
- Page 9 12. Next slide the wing into position and check alignment with fuselage and horizontal stab. Measure to insure wing is positioned properly and then use a fine tipped felt marker to mark the area where the covering will need to be removed to insure a wood-to-wood bond between the wing and fuselage.
- Page 10 15. Slide the wing into position and check alignment from several angles to make sure it is correct. Wipe away any excess epoxy with a paper towel soaked in denatured alcohol. Re-check alignment and then set aside to dry. Once dry fill in any gaps with thick CA.
- Page 11 17. You will need to trim and sand the bottom of the control horn so that it does not protrude through the top surface. Scuff the portion of the control horn that will glue into the slot and insert the horn into the base plate and secure to the aileron with 30 minute epoxy.
- Page 12 19. Next let’s assemble the main landing gear and install them on the fuselage. If flying off of tall grass you may want to forgo the wheel spats. Locate the 2 main gear legs, 2 wheel spats, 2 axles with retaining nuts, 2 wheels, 2 collars and 2 ply wood plates as well as 2 4mm bolts, washers and nuts.
- Page 13 22. Slide the wheels onto the axles and secure with wheel collars. 23. There are 2 holes pre-drilled in the outer layer of plywood near the front bottom of the fuselage for mounting the landing gear. Locate these two holes and drill completely through the fuselage with a 5/32”...
- Page 15 24. Use the manufacturer supplied hardware to install the 2 servos in the rear of the fuselage as shown with the output shafts positioned toward the rear. It is best to install the servos and then remove the screws and wick some thin CA into the mounting holes before reinstalling the screws.
- Page 16 26. Route the servo leads through the bottom of the fuselage and out of the pre-cut slot and into the radio compartment in the wing through the pre-cut slot as shown. 27. Locate the provided strip of Ultracote and iron it into position on the bottom of the fuselage.
- Page 17 28. Use the manufacturer supplied mounting hardware to install the 2 aileron servos as shown. Be sure the output shaft is centered in the pre-cut hole. 29. Now let’s assemble and install the control linkages. Locate the 4 pushrods, 8 ball links, 8 2mm bolts, nuts and washers.
- Page 18 30. Your choice of engine will determine the location for your throttle servo. When using the Saito .82 I have found it easiest to mount the servo to the hatch on its side and cut a slot to allow the servo arm to protrude through the top of the hatch. This provides a straight shot to the throttle arm.
- Page 19 32. Install the 4 provided screw eyes as shown and secure each with a drop of medium CA. 33. Secure the tank to the fuselage with nylon cable ties or rubber bands. Be sure to place a piece of closed cell foam between the tank and fuselage side.
- Page 20 30 degrees 20-40% Thanks again for your purchase of the Extreme Flight RC Yak-55SP Profile ARF. We hope this airframe provides you with all of the 3D thrills you are looking for and that you have as much fun flying yours as we have had with ours.
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