This helicopter features opening windscreen, engine with moving piston and cool spring loaded mechanism for spinning rotors. It works similarly to pullback motor but it uses shock absorber to store energy for spinning. To activate it you have to turn gear on side of helicopter clockwise. I took inspiration for this mechanism from Isogawa Yoshihito's book "LEGO TECHNIC Tora no Maki". You can see helicopter in action in this short video.

This buggy is my tribute to two special sets: 8829 (my very first LEGO set) and 8048 (the set that definitely ended my dark age). It features front axle steering, rear axle suspension, V2 engine with moving pistons and opening cab cage same as original models.