Tom,

That’s hull speed.  Basically, your stern is in the trough of your bow wave.  
See the figures in the link below:


> http://www.boatdesign.net/forums/attachments/boat-design/5014d1137160350-displacement-hull-speed-calculation-rvaluepf.jpg
>  
> <http://www.boatdesign.net/forums/attachments/boat-design/5014d1137160350-displacement-hull-speed-calculation-rvaluepf.jpg>



-
Paul E.
1981 C&C 38 Landfall 
S/V Johanna Rose
Carrabelle, FL

> On Jan 11, 2015, at 12:00 PM, cnc-list-requ...@cnc-list.com wrote:
> 
> Date: Sun, 11 Jan 2015 11:54:00 -0500
> From: TOM VINCENT <tvince...@msn.com <mailto:tvince...@msn.com>>
> To: C&C Forum <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>>
> Subject: Stus-List The stern squats at high speed
> Message-ID: <bay168-w12245ac078651d15ee5bd5eed...@phx.gbl 
> <mailto:bay168-w12245ac078651d15ee5bd5eed...@phx.gbl>>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> I was wondering if anyone else has the same problem that I have with my 36' 
> that has the 3 cylinder Yanmar 30 HP. While motoring if I increase the speed 
> the stern starts squatting the faster I go. I top out at 6.5 knots of speed 
> and the stern is way down. I have a martec 18'' folding prop and I do not 
> know the pitch.
> 
> Tom Vincent
> Frolic II 1979 36' C&C
> 
>                                         

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