转子发动机模型，可以用于教学。需要一个减速电机可以从拓竹的发动机礼品盒内的电机使用，需要26个M3X10的自攻螺丝和三个M3X6的自攻螺丝。

Rotary engine model, can be used for teaching。We need a deceleration motor that can be used from the motor in bambu's engine gift box. We need 26 M3X10 self tapping screws and three M3X6 self tapping screws。