2018 Winter Semester Flying Robot Project Team D Article 2December 12, 2018


Last our activity gave us a supposition that birds would get not lift but thrust by flapping. Our flapping flier aircraft’s main wings must play the role of acquiring not only lift by the speed but also thrust by flapping motion, so the main wings can be folded at wing-body junction and 38% position in span length and link mechanism moves the wings. Moreover, the trailing edge of the main wing is made of bendable material and flapping motion of the wings makes winds backward like a Sensu fan. Link mechanism requires a lot of gears because it is moved by a brushless motor that has high speed rotation and low torque. Required gears have various restrictions about strength and size, so we need to make the gears ourselves. We must not use commercial item but design a gearbox to fix gears optimally and make it ourselves for weight saving. The body of our aircraft must be durable to flapping motion and support the gearbox, a brushless motor, a speed controller, a receiver that receives signals from a propo, Lipo battery, and servomotors to move steering system, and a tail wing with aircraft behind, so its structure is made of CFRP pipes. The tail wing is made of balsa wood and paper, and the shape is V-tail to resemble the appearance of our aircraft to a bird. To design and make the gearbox and ribs of the main wings ourselves, we use 3D-printer and laser cutter. The 3D-printer outputs parts made of ABS plastic and the laser cutter shaves wood and acrylic. We create CAD by “inventor” in order to do more detail design.

Tohmu Yoshida