[MHml] engine power

[Dave Culp]

Which begs a question: Before spending the money on hardware, mightn't
a couple of phone calls, as to Pete Morelli and Malcolm Tenant, be in
order?

Dave

On 2/9/07, David Farmer <lightguyz at hotmail.com> wrote:
> Bill,
>   Don't know if this is of any value to you but, I spent a week aboard Dave
> Crowe's 70' Morelli designed crusing cat Hmu Hmu, and he had retro fitted it
> with twin Honda 150s, mounted under the bridge deck maybe 20' fwd of the
> transoms.  The pods would lower, as well as the outboards themselves,
> allowing good clearance when up, and close enough to the fore and aft center
> to minimize cavitation due to pitching.  This set up powered a much heavier
> boat over 10 knots in moderate chop with ease.  Hope this helps.
>
> Dave
>
>
> >From: "Bill Gibbs" <BillG at GibbsCAM.com>
> >Reply-To: Informed discussion of multihull issues
> ><multihulls at steamradio.com>
> >To: "'Informed discussion of multihull issues'" <multihulls at steamradio.com>
> >Subject: Re: [MHml] engine power
> >Date: Thu, 8 Feb 2007 07:32:50 -0800
> >
> >Discourage?
> >Hardly.  I kind of plucked 20 knots out of the air as an "ideal".  If we
> >only got to 15 we'd be twice as fast, which is not trivial.
> >
> >Of course the design challenges are non-trivial as well, and I do not have
> >one I am ready to spend money on, yet.  But I am learning
> >a lot about powerboat issues.  I'm not so concerned about the power
> >requirements of punching into big seas, as I am about trying to
> >visualize the thrust alignment of a hinged "pusher" as the couple goes over
> >big waves, or how to keep AB's bow loaded "down" into
> >head seas.  Here 6-7 knots is twice our current speed in these conditions.
> >
> >Thanks for all the input and ideas.
> >Now back to the spreadsheets and CAD files.
> >Bill
> >
> >-----Original Message-----
> >From: multihulls-bounces at steamradio.com
> >[mailto:multihulls-bounces at steamradio.com] On Behalf Of Martin Schöön
> >Sent: Thursday, February 08, 2007 4:18 AM
> >To: Informed discussion of multihull issues
> >Subject: Re: [MHml] engine power
> >
> >On 2/7/07, Dave Culp <dave at kiteship.com> wrote:
> > > I suspect a fairly major issue for Bill's application, hard to model,
> > > concerns his need to spend much of his powered voyage punching into head
> > > seas and head winds.
> >...snip...
> >
> >I sort of hope that my number crunching would discourage Bill  by
> >showing how much power he needs to reach 20 knots even on a calm day.
> > >
> >...snip...
> >
> >--
> >Martin Schöön              "Problems worthy of attack
> >                                          prove their worth by hitting
> >back"
> >                                          Piet Hein
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