小さいRC潜水艦のためのバラスト装置 ballast system for small rc submarine 

コメントありがとうございます。

1:33 is the answer

ofcourse yes

@@wat_air_submarine so as long as water level does not go over the inverted U-bend the sub floats. Ingenious.

@@wat_air_submarinehave you tried surfacing with the snorkel intake completely underwater? Can the pump still empty (generate a partial vacuum inside) the ballast tank to surface the boat until the snorkel can take in air?

真空を作るほどの力はありません。推力もありません。小径プロペラなので。

@@wat_air_submarine Aha! So this what you used to bring your submarine up in your last video. First you empty your piston tanks to bring her to deck awash then use the pumps to surface her fully. 😎😎😎