Re: [PSUBS-MAILIST] Weighing

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

Gary R. Boucher schrieb:
> 
>   My thoughts on W&B
> 
.....
>      To determine the exact position for center of mass of my boat, I took
> a simple piece of heavy angle iron, turning it so that the 90-degree
> pointed edge faced upward.  I then used hoists to lift my boat and set it
> down on the angle.  Repeated balancing efforts allowed me to zero in on the
> exact position of the CM.  Empty, my sub weighs over 5000 pounds and I
> could hold it balanced with one finger on this steel fulcrum.  Of course
> calculations are fine two, but nothing gives you the exact center of mass
> like a fulcrum.  
.....
> Gary Boucher

Hello Gary - based on this we should able to meassure the exact weight
of 
the sub with a normal personal home scale ! 

1.) Did your meassuring.. call this point A. 
2.) After mark the point - put the angle iron 2 inch aft 
    call this point B. This is our new turning point. 
    Add the personal scale with another angle bar 
    under the bow just 100 inch from point B = called point C.  
3.) Read the meassuring (M1)at the scale and subtract the weight of the 
    iron bar of the scale. (M1y)

4.) Calculate : Weight sub (W) x AB balance  M1y x CB
    or W =  (M1y x CB) / AB 

Example = 

4.1) 

Meassuring say: 120 pounds 
Iron bar on scale say 3 pound    
AB =   2 inch
CB = 100 inch 

Weight of sub = ((120 pound - 3 pound) x 100 inch ) / 2 inch = 5850
pound. 

No need for a road scale. 

Just find the longitundinal center of graphity and than use a small
personal scale. If the scale is to small - just make the distance  
AB smaller - (but allways positiv - never zero).  

Carsten