Tuesday, 13 October 2015

Construction - Basic Electric Trainer Airplane with Coroplast and Balsa wood - Part 3

Wing Construction - for SPAD LC- 40

  • If you are not able to manage 2mm coroplast sheet, you can use same thickness for top and bottom wing panels.
  • Using two different color for top and bottom will give better orientation while in air and  gives better look.

  • To make the spars and doublers use 5mm balsa shhet.
  • Cut out 02 strips of 30" length and 1 3/8" width for spar and two 6" pieces for doublers. 

  • Flip the wing over so the bottom of the leading edge point towards you. Make a mark 2 inches out from the center of the wing on both halves. This is a reference line to help you to center the wing wrap.

  • After the glue sets up, trim the trailing edge of the wing wrap so it is flush with the trailing edge of the wing.
  • Insert carbon fiber/cycle spokes/ bamboo sticks in the first and last flutes on the upper part of the wing wrap to help minimize the crushing force of the rubber bands used to hold the wing on.
  • If you want to use wing bolts in place of rubber band see the above pictures for modifications for wing bolts.
  • Use some old plastic cards on top of the wing panel, so that the bolts does not crush the coroplast sheet.

  • See the above picture, I pasted two 2mm balsa strip on the inner side and outer side of Ailrons to give it additional strength.

  • Now the wing construction is finished.
  • As a final step. you will need to temporally rubber band your wing on so you can determine the final CG. Make sure the plane is supported on the spar ( the spar is the correct location for the CG).
  • Use the battery and the receiver to acheive the correct CG position.
  • IF you are not able to achieve the correct CG position by positioning the battery and receiver, then you have to relocate your Rudder and Elevator servos or you can use some ballast weight to achieve the correct CG.
  • Once the correct CG is set, make sure all the control surfaces are moving in the correct direction with respect to your Tx inputs.
  • Make sure that the ailrons are not dropping (even the slightest).
  • Once you checked all the controls are working in the correct way they are supposed to.
  • Now the time has come to take the plane to the ground for flight test.
  • Observe all the safety precaution related to RC flying and do the flight test.
  • If you are never done any flight test before or you are totally new to RC flying - PLEASE GET AN INSTRUCTOR !!!!!
  • Wishing you Happy Flying and Safe landings.

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