[C38] Hull speed formula.

[empty1 at ntlworld.com]

It's important to remember the waterline/hull speed formula is only a very rough guideline to part of a boat's performance.With a boat with long over hangs like the C38 the waterline length increases as the vessel sits and as she heels.The fine bows make her very easy to push through the water and the fat midships tumble home gives her additional stiffness, enabling her to carry more canvas for her weight and to carry it longer.

A good rule of thumb guide for true hull speed is to see when the stern wake 'overtakes' the boat. On The Goose this is consistently about 8.5 knots, surfing downwind the gravity asist on the front of the wave can give a considerable boost.
In 10 to 15 foot seas across the Gulf of Mexico we regularly exceeded 13 knots under main and a small piece of genoa.The sharp edge at the stern seems to give her considerably better downwind handling than other IOR style boats I've sailed on.We averaged just over 9 knots for about 15hours.
Nice pictures Kerry.
PS. I WILL BE OUT ON CHEASAPEAKE BAY FROM 14TH AUGUST UNTIL 15TH SEPTEMBER. IT WOULD BE GREAT TO HOOK UP WITH SOME OTHER C38'S DURING THAT TIME AND DO SOME MUTUAL PHOTOSHOOTS UNDER CANVAS.
Cheers All.
Mark Turner, The Goose hull#80
---- littlebreeze at comcast.net wrote: 
> I'll give it a try. I think the file is large and I do not know how to make it smaller. 
> 
> This was a good photo day in the San Francisco Delta. The guy taking the photos is in a 30 foot something or other, but he carries a big camera. The wind was about 15+ knts and were were against the tide at about 7.5 knts, GPS. Seems our stiff boats will allow us to carry us to carry all the sail longer than most. Anyway, about a week earlier we went through the same area at 10 knts for about 20 minutes until the perfect sail ended at the next river. Oh, we had the boat at 14 knts, GPS, several years ago, on the motor, with the sails, coming in throught the Golden Gate, on the flood, what a ride. 
> 
> Kerry Grimes 
> Littlebreeze, 139 
> San Francisco 
> ----- Original Message ----- 
> From: "PAUL NOTTE" <panotte at shaw.ca> 
> To: "Catalina 38 Listserve" <listserve at catalina38.org> 
> Sent: Thursday, July 9, 2009 7:34:53 AM GMT -08:00 US/Canada Pacific 
> Subject: Re: [C38] Boat Speed 
> 
> 
> Perhaps Kerry of littlebreeze will send you some picts of his cat 38 in moderate wind .. How bout it Kerry? 
> 
> ----- Original Message ----- 
> From: w humphrey <hump5776 at yahoo.com> 
> Date: Thursday, July 9, 2009 6:12 am 
> Subject: [C38] Boat Speed 
> To: listserve at catalina38.org 
> 
> > Hello, I am a new user of the listserver and an owner of a 34 
> > Catalina. I have heard that the 38 is a fast boat and there may 
> > be a possibility that I may purchase one in the near future. My 
> > question is: how fast do these boats sail normally. Do owners 
> > really see 8-9knts consistently in moderate winds. I am in the 
> > great lakes and see 5-6.5 boat speed as an average with winds 10- 
> > 20 and sometimes 7 or a bit more in 20+. The reason I am 
> > considering a 38 is for more speed so any realistic real 
> > world experience would be appreciated, including performance in 
> > lighter winds. 
> > Thanks, Bill 
> > 
> > 
> > 
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