Stus-List Theoretical Hull Speed - heel vs waterline

Bob Moriarty bobmor99 at gmail.com
Thu May 23 20:38:41 EDT 2013


Interesting article. All sorts of variables involved. (couldn't see the
pictures) I was mainly presenting the idea that the bow on an upright boat
would more easily pierce waves than a boat that was getting slapped along
the flattish expanse of its forward topside. (Except for scows) Conversely,
I suppose that an increased flat area astern could help a boat to surf more
easily.

But, I'm mainly a river rat; a brown water sailor. Saw a 2-footer once.
:-)

Bob M
Ox 33-1
Jax, FL


On Thu, May 23, 2013 at 6:27 PM, Dennis C. <captbuy at yahoo.com> wrote:

> Not necessarily true.  Depends on the boat's hull shape.  For beamy boats
> perhaps but for narrower IOR designs more heel means more waterline and
> thus more speed...up to a point.  Excess heel may result in a slower boat
> as the keel loses its effectiveness and as the midships buoyancy mat result
> in the bow actually lifting out of the water and thus reducing waterline.
> Here's a good read on the subject.
>
> http://www.sailingworld.com/experts/how-heel-affects-speed-and-handling
>
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
>
>
>
>
>   ------------------------------
>  *From:* Bob Moriarty <bobmor99 at gmail.com>
> *To:* cnc-list at cnc-list.com
> *Sent:* Wednesday, May 22, 2013 9:34 PM
> *Subject:* Re: Stus-List Theoretical Hull Speed
>
> Just a minor comment.
> As the boat heels and picks up waterline length, its presentation to the
> sea state is usually increasingly sub-optimal vis-a-vis hull speed.
> Bob M
> Ox 33-1
> Jax, FL
>
>
> On Wed, May 22, 2013 at 9:58 AM, Ronald B. Frerker <rbfrerker at yahoo.com>wrote:
>
> Just to reinforce Dennis' comment; many boats pick up waterline length
> when heeling and thus increase potential boat speed.
> Also keep in mind that unless it's GPS speed, speedo's can have error.  We
> had a boat in the marina that could do 0.5kt while sitting at the dock!
> Ron
> Wild Cheri
> C&C 30
> STL
>
>
> --- On *Sun, 5/19/13, sam.c.salter at gmail.com <sam.c.salter at gmail.com>*wrote:
>
>
> From: sam.c.salter at gmail.com <sam.c.salter at gmail.com>
> Subject: Stus-List Theoretical Hull Speed
> To: "CnC" <cnc-list at cnc-list.com>
> Date: Sunday, May 19, 2013, 6:41 PM
>
>
>  My 26 has a theoretical hull speed around 61/4 knots. I've had 7.9 on a
> beam reach once with main and 135% genoa. So your not alone! I guess the
> optimum word is theoretical.
> Sam Salter
> C&C 26 Liquorice
> Ghost Lake Alberta
>
>
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