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Re: [PSUBS-MAILIST] Weighing
Gary R. Boucher schrieb:
>
> Carsten,
>
> Did you say you were supplying the Barbeque? I would almost fly to
> your country to witness a SWB!
>
> I have a couple of thoughts on weighing your sub. I once thought of
> devising a lever with a ball bearing pivot point. It could be constructed
> from a long piece of channel iron. When one end is pulled down the other
> raises. In other words lots of mechanical advantage. The short end would
> be under some structural lift point. The longer end is where extra weight
> could be added. If you had several of these placed at strategic locations
> left, right, forward, and aft of your boat and enough weights were added to
> the levers to lift the sub slightly, the sub could be weighed to locate the
> longitudinal, and lateral CMs. The calculations are easy if you have the X
> and Y locations for each scale with the weight indicated on each. You
> don't even have to have them in any particular locations. You just have to
> know the X and Y coordinates of each. Just lift the hull so that all
> weights are handled by the scales and the numbers will come out.
>
> What kind of weight are we talking about. I know its huge!
>
> G Boucher
Hey Gary
The 150 t crane witch will put the 57/67 ts unit on the slipwaycar in
some years
will give me a fine estimate figure.
And the exact trim I will find in the water. If you look at the
construction pictures
of the bow and stern section near the waterline at the free flooding
deck structure
- you will find 3 small hole strips about 0,5 inch high by 6 inch long
and vertical
locate each 4 inch on both sections and on both sides.
If the waterline is just flooded to the bottom part of the lowest one on
all four
marks (Two on the bow, and two on the stern) the boat is in pre-dive
trim.
I mark the holes before cutout with a laser with a meassured distance
form the keel.
And yes - you need a fine bouancy calculation before you can go this way
:-) .
regards Carsten