ORIGINAL: tommygun32
Just a quick question....that rear plastic geared 'diff' or rear rotor 'transfer case' in stoya's pics.....is plastic better in a heli? Or is metal better?
typically at least one set of the gears on a torque tube are plastic, they are considered to be a consumable. if the tail blades touch the ground the plastic gear will strip. something has to give when the blades hit the ground, a small plastic gear is ideal becaue it is inexpensive. metal isn't really used very much for heli gears, mainly because metal is heavy, and the strength of metal is not needed like with r/c cars. in fact, i have never seen metal being used on torque tube gears at all, even for the largest 700 size helis. pic related, its a trex 700 tail.
