Table of Contents
Advertisement
Quick Links
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.
Advertisement
Table of Contents
Summary of Contents for Merlin Hobbies Knife Loop Yak 3DAerobatic Profile ARF
-
Page 1: Instruction Manual
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
You may also email us at product support@merlinhobbies.com. Motor selection There are several motors that will work well in your Merlin Hobbies Knife Loop Yak ARF. We recommend the 2815 Brushless Outrunner from E3 and the E3 25 Amp ESC. Using an 800mah-1650mah 3 cell lipo battery will result in good 3D characteristics. -
Page 3: Optional Supplies And Tools
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... -
Page 4: Mount The Wing
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. -
Page 5: Mount The Stab
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. - 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.
- 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.
- 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: Install The Servos
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. - 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.
-
Page 12: Balance The Model
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. -
Page 13: Range Check
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.
Need help?
Do you have a question about the Knife Loop Yak 3DAerobatic Profile ARF and is the answer not in the manual?
Questions and answers