RE: catalina27-talk: Hull Speed

Tue, 03 Oct 2006 09:43:06 -0700

Title: Message
Yes indeed!  
 
 -----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED]On Behalf Of Sneddon, Keith
Sent: Tuesday, October 03, 2006 9:18 AM
To: '[email protected]'
Subject: RE: catalina27-talk: Hull Speed

When you throw "canoe" type hulls in the mix, it gets much worse, but beach cats and most other multi-hulls exceed the predictions of any traditional calculation of hull speed without planning. "Fineness" enters into it, and a form with a length over beam of, say 18, just moves through the water with less drag than a length over beam of about 3. The 1.34-1.41 factor in the hull speed equation is partially empirical, although closely related to the bow wave effect, but the equations don't work very well for radically different types of hulls.

 

Keith Sneddon

Chief Engineer

Mechanized Systems and Structures Directorate

EDO Defense Systems

1500 New Horizons Blvd.

North Amityville, NY 11701

Ph: 631-630-4092 Fax: 631-630-4244

Cell: 516-313-7420

[EMAIL PROTECTED]

 

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