Underwater Engine with Safety Propeller
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Designed for a DC 140 Motor (3V-6V, ~2000 RPM) others work, as well. After taping up the holes on the DC motor, I use lithium grease over the front "GrsRing" print. I also secure, as well as seal the final assembly with epoxy. I've a wireless robot to share soon to demonstrate the possibilities - stay tuned!
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