Bill,

Thanks for the info. I have installed cooling fans into the top of the long hood of the SD45 and planned on haveing another inside blowing past the engine. Your info on motor speed specs and the use of a brushless motor were new to me. I have NO knowledge in brushless motors.

However the standard brushed motor mfgs cautioned me to not try exceeding 12000 RPM with a standard motor as they wouldn't last long before throwing and armature or self destructing by other means.

I have located several DC brushed motors that will produce the voltages and amperage I want at RPMs from 5000 to 11000 RPM. That should allow me to run the .15 engine I have at something less than full speed.

This eliminates a gearbox requirement and I can connect it with a standard clutch setup from a car/truck.

If you could provide me with a recommendation on a brushless motor to provide up to 24 volts and 5 amps I will look into that also. I have not purchased the DC motor yet so am still open to other choices.

Thanks

Andre'