I thought I had this great idea!
A Hydrogen Fuel Cell RC car. I thought it was going to be fun to build. I looked at the motor, 7 amps for 7.2 V, so that's like 50W. So I need a 50W fuel cell...... Simple.....Not so fast. A fuel cell for that power costs ~$2500!! So, nevermind that idea. But someone has already made a hydrogen powered RC car!!
http://www.gizmag.com/go/7122/
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