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Knife Loop Yak 3D 

Aerobatic Profile ARF 

 
 

 

 

Instruction Manual 

 
 

Warranty 

 
Merlin Hobbies (

www.merlinhobbies.com

) 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 Merlin Hobbies liability exceed the original cost of the purchased kit.  
Further, Merlin Hobbies reserves the right to change or modify this warranty without notice. 
 
Since Merlin Hobbies 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 this 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. 
 
While this kit has been flight tested to exceed normal use, if the plane will be used for extremely high stress 
flying, such as racing, the user is responsible for taking steps to reinforce the high stress points. 
 
Read through this manual before starting construction.  It contains important warnings and instructions 
concerning the assembly and use of this model. 
 
 

Summary of Contents for Knife Loop Yak 3D

Page 1: ...y 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 this 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 purcha...

Page 2: ...n excellent choice to learn about sport flying Be sure to build the model straight and true Use first class radio equipment and the correct size motor wheels fuel tank and other components Properly test the operation of the controls and inspect the model for structural damage on the ground before every flight Replace connectors clevises cables horns and any other parts that show signs of wear or f...

Page 3: ...poxy Brushes Epoxy Mixing Sticks CA Debonder Trim Seal Tool Dremel Tool Inspect the control surfaces wings fuselage and included parts for damage If you find any damage please return the model to the place of purchase or contact Merlin Hobbies customer service merlinhobbies com for replacement Begin Construction Mount the Landing Gear Using the included o ring to hold them mount the main gear in t...

Page 4: ...wing that will be under the fuselage Expose the wood underneath but be careful not to damage it Trim away any cover material that is inside the wing slot of the fuselage Reinstall the wing through the fuselage Recheck that the wing is centered Use a square to check that the wing is perpendicular to the fuselage When you are satisfied with the alignment use a thin coat of 30 minute epoxy to glue th...

Page 5: ... that it is not slip the stab out and gently sand the fuselage away to bring the stab into parallel Work slowly and do not take much material at once When you are satisfied with the alignment make sure the elevator is installed and use a thin coat of 30 Minute Epoxy to glue the stab in the fuselage Wipe up any excess adhesive and set the fuse aside Build the Motor Mount Using the included plywood ...

Page 6: ...f the rounded plate you just assembled Glue both pieces in position with a small amount of Thin CA Next lay the T shaped piece on top of the ones you just glued with the tabs aligned in the notches The last three pieces of the frame fit into the remaining slots and notches to build a box ...

Page 7: ... the finished assembly to slide into position Test fit the motor mount on the airframe The 2815 motor comes with a double sided shaft and the can end must be trimmed to fit in the motor housing Using a small hex wrench loosen the locking sleeve from the motor shaft ...

Page 8: ...otor shaft through the center opening and roll the motor into the frame You may have to trim back the inside of the frame to let the large motor drop into place Use two of the supplied mounting screws to hold the motor in position Use locking compound to hold the screws in place Do not omit the thread lock ...

Page 9: ... mounted Slide the mount into the airframe and use the small predrilled holes as guides to drill mounting holes through the airframe Pass the included bolts through the holes you just drilled and secure them with the nuts Tighten and secure them with thread lock compound ...

Page 10: ... to wick better into the hinges Insert the hinge strips keeping them centered in the opening and carefully align the control surface Add six drops of Thin CA to each side of each hinge strip Allow the CA to cure slowly After the CA has cured move the control surfaces several times to make sure they are easy to move Install the Servos Trim the covering to open the servo openings in the belly and th...

Page 11: ...he servo arm and also align with the hinge of the control surface Take care to slot straight through the surface and slip the horns into the slot you just made Glue them in with Thin CA Do not use accelerator Mount the Radio ESC and Battery Use hook and loop material to hold your receiver and electronic speed control under the wing as shown below ...

Page 12: ...hly through their full range without any excess noise If the servos are straining at the end of their travel they will consume more battery power than expected possibly shortening your flight times Identify the Model Label your model with your name and phone number or AMA number This is an AMA policy and just good practice Charge Batteries Be certain that your transmitter and airplane batteries ar...

Page 13: ...then to your model s receiver Verify that all controls are working as intended and the control surfaces move freely With your antenna recessed you should be able to walk up to 50 feet 15 meters away and still maintain glitch free control If not stop and solve the problem Do not try to fly your model unless it is working glitch free Extend your transmitter ...

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