Originally posted by dsrbltoys
19t arms dont work well in "stock" cans. The arms are wound differently from 19t to ROAR stock. if you make one, then you have to reverse the wires for power. + red cable to - terminal, and - blue cable to + terminal. The difference is how the wire is wrapped at the comm. A hemispherical versus cross wind changes the direction the motor turns.
The cross wind vs. hemi wind is irrelevant to the current's direction and thus the rotational direction.
All a cross wind (aka Tamiya Wind) does is, instead of going straight up to the tab and going straight across it, it loops BACKWARD through it, crossing itself to go to the next set of winds. The wire is still travelling in the same direction, it only gets connected to the comm being looped. It's completely irrelevant to direction - but it IS somewhat less efficient, which is why Mods don't do it.
ROAR and NORRCA rules dictate a cross-wound pattern for stock motors.