Re: [PSUBS-MAILIST] Weighing

[MerlinSub@t-online.de (Carsten Standfuss)]

Gary R. Boucher schrieb:
> 
>   My thoughts on W&B
> 
....
>      To measure the vertical position for the CM I first positioned the sub
> on its fulcrum.  I then allowed the bow to be lowered several inches to a
> specific resting position on a concrete block.  Since I teach physics at my
> university, I "borrowed" some laboratory masses and a strong weight
> hanger.  By strategically placing the masses on the stern at a pre-measured
> point I was able to add mass slowly until the bow began to rise from its
> resting position and angle.  Using a little trig I calculated the vertical
> center of mass.  This is probably not needed by most sub builders who
> utilize very bottom-heavy designs employing dive planes or ballast changes
> to ascend/descend.
....
> Gary Boucher

Gary I did not understand what you excact did. 
Can you explain the little "trig" to 
meassure and calculate the vertical CM ? 

best regards Carsten