8812/8429 Aero Hawk II
Click the image to download the LDraw file of this model.
Model by Benjamin Wendl
RotorsThe rotors' rotation is driven by an input crank on the left side. This crank drives a set of 8 and 24 tooth gears. The 8 tooth gear drives the main rotor. The 24 tooth crown gear meshes with a second 8 tooth spur in turn drives another such set. The last axle runs back to a set of 8 and 24 tooth gears which reverse the gear ratio of the previous set for the tail rotor. Both main and tail rotors turn at the same rate, with a ratio of 3:1 with respect to the input crank
The main and tail rotors each have 2 blades. The tail rotor uses the specialized 2 blade rotor part for this purpose.
Click for an animation of the rotor in motion.
SkidsThe landing skids are constructed axles supported by liftarms. The wheels on the aft end of the skids are for ground handling. They allow the helicopter to be turned by hand on the ground.