New design of rudder surface,no need DIY cutting.
Nose part is strengthened by 5 layers of 5mm PP plate to improve the crashworthiness.
Wing part use single 5mm PP plate, but top 1/3 plus one layer to improve the diversion performance.
Use carbon fiber reinforced bar, durable, and easy to install and repair.
The ends of the wings can be slightly pulled out dihedral to improve self stabilizing effect.
Vertical tail use magic board instead of wood, can use fiber tape to stick when the rudder surface is flexible.