Killeen, Texas - USA
My Posts: All Forum Topic
Yes Helical gears can be used in either direction. In machine applications often the issue of helical gears comes down to the axial thrust they produce under torque, So manufacturers compensate for that with proper bearing and structural support. But in our model helicopters it is very rare that we see any such provisions as they relate to axial thrusts produced by the gears operation.... The focus on our models tend to be about the loads the Main rotor and tail rotor shafts put on the frame, thus this is often more than enough to deal with the axial load (now in the opposite direction) the gear will produce under load.
You must be careful though... in Some fuel powered helicopters Pinion gears
for example are threaded onto clutches and thus designed with the idea that they tighten under normal direction and load... this is not often the case with electrics, but ensure that no gear components are setup this way before reversing the direction of the gear train.
showing a preference will only get you into trouble, 90% of everything is crap...