Technic helicopter with motor, flex system controlling the angle of the blades and pneumatic retracting wheels.
About this creation
I built this mainly because I couldn't remember how the tilting of the helicopter blades worked exactly on my old 1994(?) Technic helicopter. I was just looking through the maunual trying to work it out and ended up building one. It is motorised, the blades tilt (just about) and the wheels retract using pneumatics.