Re: [bolger] Bolger's writeup about Diablo?

> > Diablo is easily the smoothest riding, fastest,
> > and best turning boat in her class that I've
> > ever encountered.
>
> I'll second the remarks about the diablo. It also
> has tremendous load carrying ability I have seen
> 8 people in one safely. I think this is the most
> versatile boat for a 15 horse engine going.

Hi Mike,

Thanks for this info.

John Welsford agrees with your claim about boats like this being able to plane a lot of weight. He designed a similar bottom with a long narrow planing shoe on Trover:

http://www.duckworksbbs.com/plans/jw/trover/index.htm

It looks like Jim Michalak used a planing shoe on Brucesboat too:

http://www.duckworksbbs.com/plans/jim/brucesboat/index.htm

I like the 'planing shoe' feature, it gives the boat a flat bottom section on which to sit upright when beached. It also tends to keep people in the center of the boat since that's the only flat area to walk on, so I think it's a good safety feature for this reason as well.

Sincerely,
Kenneth Grome
Bagacay Boatworks
www.bagacayboatworks.com

> Here is a computer model study I made of
> Diablo, using the program Freeship.

Thanks Bruce, I appreciate this! I keep thinking I might have the time to learn FreeShip (some day?) but for now I'm very happy to just use it as a 'viewer' program for your .fbm files.

> A couple things I notice... the bottom panel,
> nice and flat, no wonder that boat is reported
> to plane nicely. Indeed the bottom kind of looks
> like a 'shoe'.

John Welsford actually calls this feature a "planing shoe" when he uses one on his Trover design:

> She has a narrow flat bottom panel with a very
> fine entry to reduce wave impact, this planing
> shoe gives her the ability to plane a heavy load
> with a relatively small motor.

Here's the link to JW's Trover for the complete writeup in case you're interested:

http://www.duckworksbbs.com/plans/jw/trover/index.htm

In comparison with Diablo's planing shoe which looks to be absolutely flat, Trover's planing shoe appears to have some rocker in its forward section. I wonder what the advantage / disadvantage may be in using some rocker vs. no rocker here?

> As to the Bolger writeup, I don't recall one. (I only
> remember the Payson writings, pt 1 and pt 2 in two
> 1983 issues of Small Boat Journal, 1983.) Although,
> there just *has* to be a real PCB writeup in an old
> issue of Messing About in Boats, anybody know
> which issue?

I suspect that you're right about a writeup in MAIB or perhaps somewhere else. Hopefully there's a person in this group who will know where it is. With any luck it may already be online ... ?

Sincerely,
Kenneth Grome
Bagacay Boatworks
www.bagacayboatworks.com

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