HardWired II

[overkill]

The best free software is actually a very old site: http://www.teamcosmos.com/ke/ke.shtml. You have to use simplified shapes but it can give you a good idea of what your design will do. It works best with IE explorer, I have problems using it with Firefox.

Stepping up from that, you can use CAD software like Solidworks; there may be cheaper & easier software about but I don't know of anything else.

The NTM 50-60 motors have is similar output to the Mag motor in Scissorhands, which is pretty impressive for 1/8th the cost and 1/4 the weight. If you are increasing the bar's weight and tripling the speed VS Scissorhands, you will need a motor like Hobbyking's Rotomax 50cc.

Just remember my motto: 'With great power comes a great big motor to spin it'