Here the DDWFTTW cart is holding steady on the treadmill going 12 mph. The propeller is connected directly to the wheels through the front gearbox. The front wheels are very smooth plastic, and I think they are slipping a little bit. The next version will have more grip on the wheels.
I stole many design ideas from this great how-to video showing how to build this cart: http://www.youtube.com/watch?v=T-ArigMKhi4
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