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Water draw?

R/C Submarine modelers

Water draw?

Postby Ahab79 » Tue Sep 11, 2012 4:16 pm

So how do you figure out how much water you need to draw to bring a sub to neutral? Formula of some sort? I'm playing with the idea of building a piston tank instead of the RCABS.... I just know motors better than pumps.
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Re: Water draw?

Postby JWLaRue » Tue Sep 11, 2012 4:41 pm

Well, for a hobbyist it's not something that can be easily calculated. For us there are probably two ways to figure out how large your ballast tank needs to be:

1) find someone who has already built the same sub and use their size, or
2) trim your boat for the desired submerged trim. (*) Then add foam until you get to the desired surfaced water line. The volume of foam will be equal to the volume of water that your ballast tank needs to displace.


* you do not need to actually have built your dive module. Assuming that the dive module is at or below the surfaced waterline, it not being there will not affect this process.
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Re: Water draw?

Postby Sub culture » Wed Sep 12, 2012 3:24 am

A piston tank is quite a tricky thing to make without access to a lathe.
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