Hello No iron machines

as far as the motor in a thunder/spirit is the Faulhaber 1724rs9

this is rated for 9volt usage , thats why they have a limiter in the machines to stop u from overgoing 12volts
as far as speed and power ....
the ones i , gaston , and a few others use from maxon blasts these motors away

i have been using the faulhabers way back when i started , a good motor but not the fastest one out there.. dont get the 12volt version , its retarded.