GL: Denser Water Wes: Roll Causes Yaw?

[Bob DeGroot, DCH]

And that's why trawlers have sails! Couldn't resist. Fun learning from
everyone.

Bob DeGroot, D.C.H.
M/V Spirit Dancer
DeFever 49 CPMY


-----Original Message-----
From: great-loop-bounces at lists.samurai.com
[mailto:great-loop-bounces at lists.samurai.com] On Behalf Of Ralph Yost (home)
Sent: Friday, February 20, 2009 4:33 PM
To: KevinR; 'Bill Donovan'
Cc: Great-Loop List
Subject: Re: GL: Denser Water Wes: Roll Causes Yaw?

Roll and yaw are more a function of hull design, shape than anything else.
When exposed to a wave, a round hull will roll slower and gentle, whereas a 
hull with sharp corners will snap back more quickly, producing more of a 
jerking motion. The existence of a keel helps to counter it but will not 
eliminate it.
If you dont want a boat that rolls, then buy a sailboat round hull, deep 
ballasted keel and leveraged counter force (sail) to keep it stable.
R,

----- Original Message ----- 
From: "KevinR" <kfredden at verizon.net>
To: "'Bill Donovan'" <trailersource at mindspring.com>
Cc: "Great-Loop List" <great-loop at lists.samurai.com>
Sent: Friday, February 20, 2009 5:27 PM
Subject: GL: Denser Water Wes: Roll Causes Yaw?


>> -----Original Message-----
>> Of course the premise is
>> correct that the deeper propeller is pushing denser water and
>> therefor will push a little harder ..........
>
> Sorry to say, but that is an old wife's tale!
>
> Unlike air, water is not compressible, so just going down a few feet does 
> not result in denser
> water at all (even if the pressure is a little bit higher). The only way 
> to find denser water
> would be to go down far enough to penetrate a thermocline and get into 
> coler water - cold water
> is indeed denser than warm water.
>
> The only vessels that are going to get down that far however all have 
> periscopes and pressure
> hulls!    :-)
>
> Cheers,
> Kevin
> www.BoatMoves.com
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