4 ms·
> the most challenging aspect of the build was creating an interface between the motor and the propellor that was waterproof in a reliable way. There does not
by qwerta 12y ago
> the most challenging aspect of the build was creating an interface between the motor and the propellor that was waterproof in a reliable way.
There does not have to be interface. Put stator inside and rotor outside, aquarium pumps works on similar principle.
- deleted 12y ago[deleted]
- HeyLaughingBoy 12y agoThe losses across that gap are expensive, though. Aquarium impellers are moving water at very low pressures. It works if the isolation layer is very thin. However, that prevents you from going deep because of the pressure differential. Now, I wonder if you filled the sub with something inert and kept the layer thin, then the pressure differential would be a lot less and the layer a lot less likely to rip open. Might work.