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EPP Yak 55 Assembly Manual
Congratulations on the purchase of your new EPP Yak 55 airframe! The 3dEPP.com Yak airframe is a great
flyer for pilots wanting to learn basic and advanced 3D maneuvers and has been proven to be the airframe of
choice for some of the top pilots in the realm of 3D Flying. The tabbed design makes assembly super fast,
super simple allowing you to get in the air quicker than ever before. Constructed from EPP this airframe is
very durable and will provide hours of 3D flying fun!
SAFETY during Assembly
While assembling this kit the builder will be using standard modeling tools such as knives, adhesives,
soldering iron and other common power tools. Please follow all safety precautions outlined by the
manufactures of the products you use during construction of your kit, and always follow the important
guidelines listed below.
ALWAYS protect your eyes when working with power tools, hand tools, knives and adhesives. It is highly
recommended that safety glasses are always utilized when working with this type of equipment.
ALWAYS protect your body, fingers and hands when working with knives, adhesives, or tools. Never cut
towards exposed skin when using hobby knives or blades. Insure hobby knives are placed on tables or
benches in a manner that will not allow them to roll or be knocked off.
ALWAYS have access to a first-aid kit handy when working with knives, adhesives, or tools.
ALWAYS keep knives, adhesives, and tools out of reach of children.
SAFETY while Flying
SAFETY FIRST: Your EPP Yak 55 should not be considered a toy, but rather a sophisticated, working model.
The EPP Yak 55 is capable of extreme maneuvers and if not operated correctly, could possibly cause injury to
yourself or others and damage to property.
ONLY fly your aircraft in a safe open area, away from spectators, roads, vehicles. Never fly near overhead
power or utility lines. Never attempt to retrieve an airplane that has become stuck in utility power lines or
trees.
NEVER fly to close to yourself or other spectators. Spinning propellers are DANGEROUS!
ALWAYS fly within your control and never outside of your ability. 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
area or R/C club for your first flight.
ALWAYS have fun and be safe!

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Summary of Contents for 3dEPP EPP Yak 55

  • Page 1 SAFETY FIRST: Your EPP Yak 55 should not be considered a toy, but rather a sophisticated, working model. The EPP Yak 55 is capable of extreme maneuvers and if not operated correctly, could possibly cause injury to yourself or others and damage to property.
  • Page 2 For additional information we highly recommend checking out the following links on RC Groups for tips, tricks and additional information. 3dEPP Website: www.3depp.com 3dEPP YAK 55 THREAD: http://www.rcgroups.com/forums/showthread.php?t=1101664 Leadfeathers EPP YAK 55 TREAD: http://www.rcgroups.com/forums/showthread.php?t=964237 EPP YAK 55 OWNERS CLUB: http://www.rcgroups.com/forums/showthread.php?t=1028213...
  • Page 3 3Depp.com Build instructions 1. Lay out wax paper on flat surface. 2. Align wing, forward fuselage, aft fuselage and stabilizer. 3. Starting at the front motor mount apply a small amount of Welders glue along the back edge of the motor mount and forward center section of the wing where the tab is...
  • Page 4 4. Repeat this process for the joints between the aft wing and forward side of aft horizontal fuselage assembly and between the aft side of the aft horizontal fuselage assembly and the forward side of the horizontal stabilizer and elevator assembly. 5.
  • Page 5 7. Once alignment is verified glue top of fuselage to top of wing assembly. Use a thin bead of Welders glue on the lower mating surface of the upper fuselage spreading glue evenly with your finger. Do not put glue in the area forward of the aileron servo cutout or forward where the motor mount will go.
  • Page 6 14. Next wipe each of the servos with a clean cloth and alcohol to remove grease residue on the outside of the servo housing. 15. Center the aileron servo with your radio or servo centering tool and install the long double sided servo arm.
  • Page 7 16. Glue aileron servo with horn located towards the rear of aircraft. Glue servo in place with hot glue a small amount on the mounting tabs of the servo case is sufficient. 17. Next locate the 10mm motor mount supplied with the kit. Lightly sand the surface of the motor mount to insure a good bond between the motor mount and the foam.
  • Page 8 18. Put a bead of Welders glue on all sides of the upper & lower fuselage to wing assembly mating areas. Use a round dowel rod along the length of the joint form a nice fillet between fuselage and wing and tail assembly.
  • Page 9 19. Test fit the plywood control horns in precut slots on top side of ailerons. Make sure the small hole in the control horn is directly above the hinge line. Once the fit has been verified remove the control horn and apply a small amount of Welders glue or super glue to the control horn and insert into slot in foam again making sure the hole in the control horn is directly above the hinge line.
  • Page 10 20. Install the pre-made end of the aileron control horn into the plywood control horn that was just glued into the aileron control surface.
  • Page 11 21. Install the pre-bent z bend music wire into the aileron servo control arm. Make sure the aileron servo is centered for the next step. It is very important to make sure the servo is centered. Next slide a piece of heat shrink tubing onto the carbon rod. Now hold the carbon rod and the music wire on the forward side up by the servo parallel to each other and super glue together making sure again the aileron servo stays centered and the aileron is flat on table (it may be necessary to trim the carbon rod if it is to long and...
  • Page 15 22. Install elevator servo in right side of fuselage and glue in place with hot glue. 23. Cut a small slot in foam for servo wires to feed thru to receiver as show in picture. 24. Test fit the plywood control horns in precut slots on top side of the elevator. Make sure the small hole in the control horn is directly above the hinge line.
  • Page 16 been verified remove the control horn and apply a small amount of Welders glue or super glue to the control horn and insert into slot in foam again making sure the hole in the control horn is directly above the hinge line. 25.
  • Page 17 26. Center the rudder servo, install servo horn in precut slot on rudder and repeat the process used on the ailerons and elevator to complete the rudder control rod assembly. 27. Solder the motor to the esc, and make sure motor is spinning in the right direction. Install the motor into the motor mount and tighten small screw located on the lower side of the motor mount.
  • Page 18 28. Install Velcro on the right hand side of fuselage for mounting battery, we use the ruff side of Velcro on the plane and the fuzzy side on the battery. 29. Put small piece of Velcro on left side for esc & receiver again we use the ruff side on the place and the fuzzy side on the esc and receiver.
  • Page 19 CG should be about at 9’’ from the nose of the plane. You can use this as a starting point and change it to your liking. The Yak 55 has a wide range of CG so play around with it to see what you like.