[Rhodes22-list] Measured Hull Speed

[Michael Meltzer]

it a case where everyone is right here,

watch the 2 terms, HULL speed and engine cursing speed,

hull speed is about 6.25 on a rhodes22.
the engine cursing speed might be less, first off it takes about 6hp to push a rhodes22 at hullspeed, but by lowing the speed a
little (like 5) knots the power req drop to around 3-4 hp. I have the caluatilied number somewhere but need to dig them up.

MJM

----- Original Message ----- 
From: "Steve" <rhodes2282 at yahoo.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Wednesday, July 23, 2003 11:11 AM
Subject: Re: [Rhodes22-list] Measured Hull Speed


> Michael/Roger
> Didn't we calculate hull speed for the R22 at around
> 5.9 kt some time ago.  Who still has that formula?  I
> know that when I out sailing; for me to the my boat
> plaining; I uselly need to hit 6 kt to get a good
> plain going.
> Steve
>
>
> --- Ronald Lipton <lipton at sprynet.com> wrote:
> > Hull speed is not an absolute limit - it is just the
> > point where the power
> > vs speed curve becomes very steep.   To do a proper
> > job one should
> > plot speed vs engine RPMs and see where there is a
> > significant change
> > in the slope (I have neve seen cush a plot myself).
> >
> > Ron
> > ----- Original Message ----- 
> > From: "Christine Allison" <sailnut at asan.com>
> > To: "The Rhodes 22 mail list"
> > <rhodes22-list at rhodes22.org>
> > Sent: Wednesday, July 23, 2003 8:52 AM
> > Subject: Re: [Rhodes22-list] Measured Hull Speed
> >
> >
> > > In my opinion the boats hull speed is about 5.2
> > knots or a little better.
> > I
> > > make it a point to run my GPS to aid in sail trim
> > when the boat is
> > cranking
> > > along.
> > >
> > >  I recognize that the GPS provides speed over the
> > ground however after a
> > lot
> > > of observations and taking the state of the
> > current into consideration I
> > > think a Rhodes would be hard pressed to maintain
> > more then 5.2 knots and
> > in
> > > actuality probably 4.7 to 4.9 knots (sustained)
> > would represent excellent
> > > sailing.
> > >
> > > Richard Smith
> > >
> > > __________________________________________________
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