[Public-List] hull speed

[brooks.glenn at comcast.net]

I've suspected for a long time that under certain conditions, like high speed powering, and maybe sailing on the reach, that the boat indeed sinks into the water to obtain longer water line length. Alberg has long overhangs, and my boat definitely goes stern down into water under power. so maybe once in a while, gets a little longer waterline hence speed. 


We have one of the best in-stream tidal power currents on the west coast, right outside our harbor in Puget Sound. Unfortunately most of my above theoretical boat speed' passages were mostly due to a friendly 3 kt current going my way. ( I have plenty of low- end-boat-speed-passages the other direction! Oh how I wish for 8 knots on those days...) 


glennb 
Dolce 

----- Original Message -----
From: "Stephen Gwyn" <gwyn at beluga.phys.uvic.ca> 
To: public-list at lists.alberg30.org 
Sent: Wednesday, November 16, 2011 11:53:16 AM 
Subject: [Public-List] hull speed 


I've sailed at 8 knots for hours, but the conditions 
have to be just right. A reach, with just the right 
amount of wind, and the waves can't be too high. 
The quarter wave moves slightly behind the stern and 
the boat kind of digs itself a hole in the water. 
It's fantastic when it happens! 

But the most I can do under power is 5.5. Maybe 
a little bit more with a very clean hull and prop. 

Stephen Gwyn 
#495 


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Stephen Gwyn | Tel: 1-250-363-3136 
Dept. of Physics & Astronomy | Fax: 1-250-363-0045 
Univ. of Victoria | Cell: 1-250-885-6969 
PO Box 3055 | E-mail: gwyn at uvastro.phys.uvic.ca 
Victoria, BC V8W 3P6 | http://orca.phys.uvic.ca/~gwyn 
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