PatternShip

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 This is a 1 meter pattern aircraft ... not a typical shock flyer.




Dimensions (mm)


The whole aircraft is made out of EPP

The wings was hot wired out of EPP.. RAE100, a medium thickness airfoil was chosen over a thick airfoil to reduce drag. It has two 3X1mm CF strips glued on the top and bottom surface at 35% cord, and one outrigger to the tip TE. The ailerons are 6mm depron.

The horizontal and vertical surfaces were 10mm flat plate EPP with the LE rounded. The TE was left as it is to have requisite strength. 3X1mm CF strips are glued along the hinge line for strength

The fuselage has a EPP 50mmX40mm central spine which has 3 CF rods (3mm) glued along the length for torsional and longitudinal stiffness. The wing and the horizontal and vertical surface is mated to this central spine. The overall outline of the fuselage is a 10mm EPP which is also glued on the central spine. The battery is pushed in a through slot in the spine (between the CF rods). The slot is cut as forward as possible, keeping in mind the strength of the motor mount. Ply doubler  was epoxied to strengthen the front portion including the motor mount. 

Finishing EPP is a challenge. All the EPP parts are sanded, lightly ironed and finished with two coats of paste of water soluble PU and  talcum powder, with light sanding between the coats. It made the surface smoother, sealed the EPP, added little stiffness while still remaining flexible.. it allowed tape to stick to EPP

The aileron servos were mounted in pockets carved in the wing. The tail surface servos were mounted pockets carved in the central spine midway between the wing TE and tail LE

Cyno was the primary adhesive  to keep the weight low. Hot glue was used to reinforce some joins. Epoxy was used to mount the motor firewall and the doubler. 

Electronics

- 2212 1200 kv motor, 10X4 prop, 30amps ESC, 4 x 9gms servo, 1500mAh bty

AUW :- 615gms

CG @5%SM :- 87

After a couple of test and trimming flights, the aircraft was fully sorted out (CG , throws, lateral balance). I fly it in 3 flight modes, normal speed and acro with increasing throws and expos. 

It is a great plane to fly. .. maneuverable but steady... 

Comments

  1. Anonymous26 November 2023 at 19:57

    Hi Rahul. This one is very amazing plane and I will certainly try building one for myself. Thank you and Cheers 🍻

    ReplyDelete
  2. Raji Khanna26 November 2023 at 20:01

    I also thank you sharing the plan.

    ReplyDelete

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