I caught part of a show regarding non-conventional automobile fuels, including fuel cells, high powered electric cars (very fast and quiet), hydrogen, and very high mileage/high powered vehicles (e.g. 140 MPG with lots of horses). After listening to this for a few minutes, it seems like electric motors have something to offer to aviation. Thanks

I am wanting to build a device to move a trailer loaded with a light boat. To power this thing I would like to use a 12 volt D.C. motor, possibly a starter motor from a car. This is where my lack of knowledge begins. I don’t know how to control speed and rotational direction of a motor, or [...]