[Alberg30] Alberg 30 center of gravity

[Bob Johns]

On Monday, April 22, 2002, at 07:34  AM, chrishardy wrote:

> A very accurate way to find cg is to cut out the profile view of a 
> picture of the a-30 enlarging the image may help. then fold the picture 
> up like paper doll parallel to the waterline. then balance the folded 
> paper on a pin mark it unfold it and there you have it. This info is 
> right out of Chappells Yacht design that's how the pros used to do it 
> before computers..  Chris

Chris,

I'm not sure what you mean by: "fold the picture up like paper doll 
parallel to the waterline", but you are describing a method of locating a 
"center of area", not a "center of gravity". If you cut out the profile of 
the hull shape below the waterline and balance it on a pin you are finding 
the "center of lateral area" (with the boat in an upright position).

You have to consider the locations of weights, not just area. Not sure if 
I am saying this very clearly.

Bob Johns, Wind Call #397

 +-----------------------------------------------------------+
 | ** Skymate Windmeter $18.00 off! Product code JDCSM-18 ** |
 | http://www.myaffiliateprogram.com/u/sailnet/t.asp?id=1066 |
 +-----------------------------------------------------------+


_______________________________________________
Public-list mailing list -- Public-list at alberg30.org
http://www.alberg30.org/mailman/listinfo/public-list
To unsubscribe: email to Public-list-request at alberg30.org
Include command "unsubscribe <password>" in subject or body.
Use command "help" for more options.

 1019494637.0