[Jizvonius]

I think the internal gear idea can work if the pitch diameter is large enough. Then it wouldnt require nearly as much force on the gear teeth as it would be applied far from the center of rotation. This thread actually made me resurrect an old idea that can possibly make a very compact drive module. The gears(except the internal gear), brackets and shafts are missing from the inventor drawing, but the spacing has been worked out in 2D. The model so far should give you an idea of what I'm working towards though. The gear ratio ends up being about 15:1. The weight looks like it will end up being about 8 lbs and the size is about 8"x6"x6". The design obviously needs more thought, but I figured that I'd put it out there.

I have many variations of this design that move components around for different purposes. This one is to minimize the amount of gearing and space for the motor-gearbox-wheel system.

Jevawn

BTW i did this last night at around 4:30am so any resulting crappyness of the model can be attributed to that.