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[neitosub]

I think it's perfectly valid. The only drawback I can think of with bottom access is when you flip the submarine over to open the hull, you risk damaging...

[neitosub]

A standard outrunner brushless motor will run just fine in fresh water. Make sure you spray WD40 on the bearings after each run to keep the motor well...

[neitosub]

It's normal that a little bit of water enters via the pump, since the system doesn't have a valve. How much water is flowing into the ballast tank per...