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» Pinger 2 - Ultrasonic
Tue Jun 12, 2018 5:53 pm by timgarrod

» the SAS ballast sub-system
Tue Jun 12, 2018 1:47 pm by merriman

» The Model Show - indoor swimming pool sailing - Poynton,Stockport 15,16th September 2018
Mon Jun 11, 2018 1:35 pm by david f

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» Sub wanted
Thu May 31, 2018 2:31 pm by dgp1957

» model submarine test tank on the cheap
Sat May 26, 2018 8:45 pm by merriman

» engle piston tank convert to servo control
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    model submarine test tank on the cheap

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    merriman
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    Posts : 181
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    model submarine test tank on the cheap

    Post  merriman on Thu May 24, 2018 1:34 pm

    Both model boats and submarines have to be trimmed out so that they float at the designed waterline -- and in the case of a submarine, while it's immersed in the water it is commanded to sink to see how close to neutral buoyancy it's at. Coupled with the task of established submerged displacement the test tank permits observation of the 'at rest' pitch and roll orientation of the boat.

    Calculations will take you only so far, but the real work is practical observation and adjustment in water deep enough to accommodate the model submarine -- a test tank deep enough to permit the submerged submarine to sink and not hit the bottom of the test tank once completely under.

    You can press the house tub into service, spend several hundred bucks for a galvanized steel animal trough, or you can go cheap and use one of those long and tall plastic dry-goods container outfitted with suitable strengthening elements to keep if from distorting one filled with water. That's what I did recently -- a lot easier than running up-stairs to use the bath-tub. Walmart has 'em for about twenty-bucks.



    A quick trip to the back-yard #1 shed secured the wood needed to stiffen the plastic container (test tank) and reinforce the big card-table that supports everything. Without the reinforcement at the long sides of the flimsy plastic tank, it would bow out with the water pushing it out of shape, making the thing nearly useless. I also strengthened the underside of the card-table with a pair of two-by-fours to keep it from buckling under the weight of the filled test tank.







    I had things done in half a day. Once filled with water I went about the task of checking out the five boats I'm bringing to the Groton Officer's Lake fun-run next week. And, in a few weeks after that, I'll use this test tank to check out six new boats I'm readying for the Newport News Fall Festival and NC City Lake all 1/96 'fleet run'. I'm old, fat, and don't want to schlep things between shop and up-stairs bath-tub as I adjust foam and fixed ballast weight as I trim out a boat. The new outside test tank is right outside the shop door. Perfect!





    David

    timgarrod
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    Re: model submarine test tank on the cheap

    Post  timgarrod on Thu May 24, 2018 5:11 pm

    what a brilliant idea
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    merriman
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    Re: model submarine test tank on the cheap

    Post  merriman on Thu May 24, 2018 7:27 pm

    timgarrod wrote:what a brilliant idea

    The plastic 'tank' is readily available, cheap, and does not require much in the way of carpentry to make practical.

    I did the same thing for a smaller in-the-shop test tank for the WTC's and small scale r/c submarines. The shallower and smaller in length plastic containers can also be pressed into test-tank service, and without supports on the sides:







    David
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    salmon
    AMS Forum Owner

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    Re: model submarine test tank on the cheap

    Post  salmon on Sat May 26, 2018 6:25 pm

    David,
    I keep learning from you! Every photo seems to have a nugget of information.
    Thank you!
    Peace,
    Tom


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    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
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    merriman
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    Re: model submarine test tank on the cheap

    Post  merriman on Sat May 26, 2018 8:45 pm

    salmon wrote:David,
    I keep learning from you! Every photo seems to have a nugget of information.
    Thank you!
    Peace,
    Tom

    Just passing it on, Tom. Something we're all obligated to do … if the Craft is to survive.

    David

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    Re: model submarine test tank on the cheap

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