Instruction manual

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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 content (13 pages)

PAGE 1
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.
PAGE 2
Safety precautions Be aware that this model is a sophisticated working model that functions much like a real aircraft. Correct assembly and operation are critical to the safety of both yourself and spectators. Be sure to get experienced, knowledgeable help from an instructor with the construction and flight of your model. Your local hobby shop has information on local clubs in your area.
PAGE 3
CA Accelerator 30 Minute Epoxy Hobby Knife and blades Builders Triangle Masking Tape Electric Power Drill Pliers Filament used for alignment purposes Screwdrivers Threadlock Compound Assorted Drill Bits 1/16 thru ½ Felt Tip Pen Metal File Optional Supplies and Tools 6 Minute Epoxy CA Applicator Tips Epoxy Brushes Epoxy Mixing Sticks CA Debonder Trim Seal Tool Dremel Tool Inspect the control surfaces, wings, fuselage, and included parts for damage.
PAGE 4
Mount the Wing Slide the unassembled wing into the opening in the fuselage. Locate the wing at its center and carefully mark the interface of the wing and fuselage with a permanent marker. Remove the wing and carefully trim out the covering of the 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.
PAGE 5
Mount the Stab Trim open the stab opening. Adjust the stab in position until you are satisfied that it is square. Using a felt tip pen, mark the underside of the stab along the edges where it meets the fuselage. Slip it back out and trim out the covering on both sides where the fuselage covers the stab Mount the wings at this time and slide the stab back in place. Check that it is parallel with the wings.
PAGE 6
Next, align the center opening of the smooth rectangular plate, to the center opening of 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
Trim the airframe of the model as shown below. This will allow 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
Remove the sleeve and put it aside, the motor mount you have just built will replace the lock. Slip the motor 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
This is how the final assembly looks with the prop adapter and prop 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
Done. Install the Control Surfaces and Rudder Most of the control surfaces have been pre slotted. If you find that hinge strips do not go in or are difficult to install, use a hobby knife to open them up. Drill a 3/32” hole in each slot to allow CA 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.
PAGE 11
Connect the Control Horns Carefully select the mounting area for each control horn. The horn should be in line with the control rod coming from the 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
Use hook and loop material to hold the battery on the other side of the fuselage as shown below. This will help with balancing. Balance the Model With the plane fully assembled and no fuel, lift the plane by the wings and check the balance point. The center of gravity should be on the main spar that can be seen through the wing covering 1/3 back along the wing root. Adjust the CG by adding stick on lead weights to the tail or the firewall as necessary. The CG may be moved forward or back up to ½”.
PAGE 13
Range Check At the field, ensure that your radio channel is not occupied and that it is safe to turn on your radio. Apply power to your radio transmitter, 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.