Bolger's Diablo and Samuel Clyde

[bluw...@my-deja.com]

I've been browsing through Bolger's "Boats With an Open Mind" and
Payson's "Build the New Instant Boats". Payson's book talks about
building a skiff type of boat called Diablo and Bolger's book describes
a power cruiser called Samuel Clyde, which uses the same type of
multi-chined hull. Can anyone tell me what kind of hull this is? Is it
referred to by any particular name?

I really like the Samuel Clyde. Has anyone built or bought plans for
this boat? How does the construction differ from Diablo? I'm also
curious as to weather the Samuel Clyde has any rocker to the bottom. I
realize this is a planing hull, but isn't any flat bottom boat able to
plane?

Thanks for any info you can offer.

Regards,
Dennis

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[Chris Crandall]

bluw...@my-deja.com wrote:
: a power cruiser called Samuel Clyde, which uses the same type of

: multi-chined hull. Can anyone tell me what kind of hull this is? Is it
: referred to by any particular name?

It's a power v-hull, built with multi-panel stitch-and-glue.

: I'm also

: curious as to weather the Samuel Clyde has any rocker to the bottom. I
: realize this is a planing hull, but isn't any flat bottom boat able to
: plane?

No, not all flat bottoms can plane, at least, not normally. (For example,
my power scow won't plow unless wildly overpowered, and then, dangerously
and uncontrollably.)

The Samuel Clyde has little rocker aft, and a V forward. It's definitely
built as a planing boat.

-Chris Crandall

[bluw...@my-deja.com]

Thanks Chris. Rocker is still somewhat of a mystery to me. I
understand heavy rocker is used to create displacement hulls, decrease
wetted surface, thus lowering the power requirements to cruise at the
hulls designed displacement speed. From my understanding, rocker also
allows increased draft at its lowest point, allowing the boat to handle
beam winds better but results in poorer tracking. Does this sound
correct? I would appreciate anyone who can demystify this for me. :-)
Also, any pointers to books on this subject would be appreciated. I
can't find anything in my ever-growing nautical library specifically on
rocker.

A good example of rocker used in a displacement hull is to compare
Bolger's Retriever against Champlain. Retriever's bottom is dead flat
(I think) and is a planing hull, even if it planes on a box keel, and
requires at least 70 hp to get 20 knots. Champlain has a really heavy
rocker but only requires 9.9 hp to cruise about 7 knots I believe.
Besides that, the hulls are identical and both use the cutwater. I
would think that Champlain doesn't track very well, and must see-saw
like crazy. Any comments on this?

Regards,
Dennis

In article <7pi85b$b27$1...@news.cc.ukans.edu>,

[Peter Vanderwaart]

> I would think that Champlain doesn't track very well, and must see-saw
>like crazy. Any comments on this?
>

Why would you think that? I bet Chamnplain slides along as smooth as can
be.

Peter

[bluw...@my-deja.com]

Hi Peter. My knowledge of boat design is very limited as you can
probably tell by the last post I made in this thread. :-) My suspicion
on Champlain's tracking is not based on any solid nautical theory. The
reason I mentioned possible poor tracking is because of the heavy
rocker, the center portion of the hull has the biggest "bite" of the
water while forward and aft have hardly any draft. It seems like a beam
wind or current would make the boat pivot amidships. That's why I think
that and it's only a suspicion.

Regards,
Dennis

In article <7pv8g2$2ul$1...@autumn.news.rcn.net>,

[Dick Parshall]

bluw...@my-deja.com wrote:
>
> Hi Peter. My knowledge of boat design is very limited as you can
> probably tell by the last post I made in this thread. :-) My suspicion
> on Champlain's tracking is not based on any solid nautical theory. The
> reason I mentioned possible poor tracking is because of the heavy
> rocker, the center portion of the hull has the biggest "bite" of the
> water while forward and aft have hardly any draft. It seems like a beam
> wind or current would make the boat pivot amidships. That's why I think
> that and it's only a suspicion.
>

> In article <7pv8g2$2ul$1...@autumn.news.rcn.net>,
> p.vand...@erols.com (Peter Vanderwaart) wrote:
> > > I would think that Champlain doesn't track very well, and must
> see-saw
> > >like crazy. Any comments on this?
> > >
> > Why would you think that? I bet Chamnplain slides along as smooth as
> can
> > be.

Bolger has modified the plans to include a pair of small "trim tabs" at
the
stern to help it track better, after several were built. The problem
wasn't
a major one, just a minor correction.

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Dick Parshall IT Support, 3M Corp, Austin TX
rvpar...@mmm.com (512)984-3972
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