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Born in Detroit - where the weak are killed and eaten. -
John Slater
Sydney Australia
You would not steal a wallet so don't steal people's livelihood.
Think of that before your buy "cheap" pirated goods or download others work protected by copyright. Theft is theft.
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From what I've read so far. The pump would stop pumping and get vapor locked or cavitate when operated against a closed head.Last edited by redboat219; 04-08-2014, 02:54 AM.Make it simple, make strong, make it work!Comment
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For precision of trimming it's really impossible to beat a piston tank. If you look at Romel's earlier link that shows a boat which incorporated a small servo actuated piston trim tank slotted within the main ballast tank, so not essential to go down the path of having a large piston tank for main ballast and trim.
Generally a trim tank should be sized to equal about 1% of the boats overall displacement, plus a few grams if you want to make the boat go negative. Water only varies in density by 1% depending on temperature and mineral content. Most model submarine ballast systems tend to equate to about 10-15% of the boats overall displacement, so 10-15% of that tank gives you about the right size tank, but be careful if you are dealign with something with large freeboard, else you end up with a larger trim tank than you really require.Comment
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Windshield washer pump/closed tank ballast system
A nice build of Revell's 1/72 Type VII utilizing a windshield washer pump/ closed tank equipped with a pinch valve at a Spanish site.
Crude but effective.Last edited by redboat219; 11-11-2014, 01:32 AM.Make it simple, make strong, make it work!Comment
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Micro drain 12v pump for air or liquid, including fuel. In and out put. Most likely needs a capacitor, and a reverse polarity connection for R/C use and dual purpose suck and blow +<-----> -Comment
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