[Rhodes22-list] Measured Hull Speed

[Roger Pihlaja]

Michael is correct.  Please forgive me, I was careless with my nomenclature.
I meant that 5-1/4 knots is about the most economic motoring speed for
Dynamic Equilibrium.

How do you people plan your trips if you don't know what fuel mileage to
expect?  This is pretty fundamental stuff.

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message -----
From: "Michael Meltzer" <mjm at michaelmeltzer.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Wednesday, July 23, 2003 11:20 AM
Subject: Re: [Rhodes22-list] Measured Hull Speed


> 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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