[PUP] Reducing roll in a seaway

[Truelove39 at aol.com]

Hi John,
 
Right. And, because this sail is so small (a bit over 100 sq ft) it doesn't  
contribute as much windage as does the hull and superstructure - it merely  
adds a small amount.
Nevertheless, the (included) angle the boat rolls through when heeled  in a 
beam wind becomes less, the further heeled it is. I believe this  is due to the 
ballast becoming more effective, as the wind force is only  decreased by 
heeling and "spilling". Of course the reserve buoyancy is  increasing on the 
leeward side the hull too. 
 
Thoughts?
 
John
 
 
 
 
In a message dated 1/27/2009 12:51:02 P.M. Eastern Standard Time,  
JohnPH at Comcast.net writes:

I would  suggest that the very good improvement in roll stability that you 
observe  in a sail boat with sails set is not so much do to the weighted keel 
 
(which is important to keeping it upright) as it is to the large increase  
and decrease of force on the sail as the APPARENT velocity of the boat  
increases and decreases in phase with the roll in such a way as to  maintain 
a perfectly phased  stabilizing force on the roll of the  vessel.

Keep the sails full.

John Harris  



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