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Do-all boat?

 
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Robert or Karen Sw

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Since: May 24, 2004
Posts: 67



(Msg. 1) Posted: Sun Jan 01, 2006 8:02 am
Post subject: Do-all boat?
Archived from groups: rec>boats>building (more info?)

Is anyone aware of a boat, or plans for a boat, that would encompass light
weight (<1500lb), trailability, 16 - 22 ft, able to plane at high speed on a
relatively small motor (15-25 mph on 25-50 hp), cabin to accommodate two
people for at least weekends, and still be sailable? I realized it wouldn't
excel at any of these tasks, but I am curious to know if such a do-all boat
exists.

Bob Swarts

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bowgus

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Since: Feb 22, 2005
Posts: 72



(Msg. 2) Posted: Mon Jan 02, 2006 4:46 am
Post subject: Re: Do-all boat? [Login to view extended thread Info.]
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I would think that any small boat capable of planing under sail would
be capable of planing (with dagger board raised) propelled by an
outboard. The trick I would think would be to arrive at the minimum
requirements for the outboard i.e. have the required power and at the
required minimum weight ... not well put, but you know what I mean.

OT: I saw a few years back at a boat show, a self-propelled surf board.
It used a relatively powerful jet propulsion system. A bit bizarre but
one of those turbo engines would likely meet the power/weight
requirement ... not that I would want to be in the boat with one of
them ... noisy or what.

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bowgus

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Since: Feb 22, 2005
Posts: 72



(Msg. 3) Posted: Mon Jan 02, 2006 2:39 pm
Post subject: Re: Do-all boat? [Login to view extended thread Info.]
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In outboard mode, no rudder req'd Smile. As to that jetboat mod, the
engine would be low and inboard ... I myself,as mentioned, could not
tolerate the noise. As to daggerboard, I guess our styles differ ... in
a dingy/on a wind surfer on a broad reach and plane, up comes the
daggerboard ... take care though else yer rockin an rollin Smile And hey,
no boat is an investment Smile
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William R. Watt

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Since: Jun 25, 2003
Posts: 835



(Msg. 4) Posted: Mon Jan 02, 2006 5:05 pm
Post subject: Re: Do-all boat? [Login to view extended thread Info.]
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"Robert or Karen Swarts" (ravensrest@olypen.com) writes:
> Is anyone aware of a boat, or plans for a boat, that would encompass light
> weight (<1500lb), trailability, 16 - 22 ft, able to plane at high speed on a
> relatively small motor (15-25 mph on 25-50 hp), cabin to accommodate two
> people for at least weekends, and still be sailable? I realized it wouldn't
> excel at any of these tasks, but I am curious to know if such a do-all boat
> exists.

It would be an interesting design exercise to find where the two
efficiency curves cross for various displacements. There are enough
formulae in boatbuilding books and free hull design computer programs for
an amateur to try. The www.ncf.ca/~ag384/Solo15.htm design might come
close. It's near the limit of sailing efficiency. There may be a problem
trying to sell a boat build from such a design.
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