飛機設計,,,,,,,,,,,,,,請幫助

機身用竹 is good enough, but it needs to be strong enough to suppoer the wing. The main problem is what material you will use for the wing.

having a wing in the middle and the back of the airplane should be right. The hardest part is setting the angle of both wing, because that will help you to balance it when it is flying.

長方形機翼 is the easiest to start with. No need to use 螺旋槳. And 機尾翼 is 長方形 . Again, the balance between the main 機翼 and the rear wing is the most important. Plane with a pointy head will have less drag when it fly through air.