[PSUBS-MAILIST] cheap weigh scale

[Alec Smyth via Personal_Submersibles]

Elegant!

On Fri, Jan 15, 2016 at 8:40 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Today I was anxious to know how much my new sub weighs now that the hatch
> and port frame is all done and working.  So I built a weigh scale-it is a
> hydraulic cylinder hanging from my gantry chain hoist.  One end is hooked
> to the hoist and the other end is hooked to the sub.  There is a very
> accurate gauge threaded into the hydraulic cylinder port with a shut off
> valve and a tee with a hydraulic hose going to the other port on the
> cylinder.  When I lift the sub the cylinder tries to stretch and the gauge
> rises.  You just take the area of the cylinder bore and subtract the area
> of the cylinder rod then multiply the result by the pressure on the gauge.
> It is very accurate-I know because I was adding and subtracting weights to
> check it.  Just leaning on the sub moves the gauge.
> Hank
>
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