[bolger] Re: Sea of Peas

Sam,
sorry for this delayed response. I believe you've got it correct, but
I definately recall reading Bolger, somewhere, writing that it was
more important forward than aft. He said the eddies from the chines up
front would cause drag all along the hull. ( The trouble with
understanding this is he also writes that the AS19 bow should be more
pinched in!)

ONLY for flat-bottom sharpies.
--
Craig O'Donnell
Sinepuxent Ancestors & Boats
<http://freepages.genealogy.rootsweb.com/~fassitt/>
The Proa FAQ <http://boat-links.com/proafaq.html>
The Cheap Pages <http://www.friend.ly.net/~dadadata/>
Sailing Canoes, Polytarp Sails, Bamboo, Chinese Junks,
American Proas, the Bolger Boat Honor Roll,
Plywood Boats, Bamboo Rafts, &c.
_________________________________

-- Professor of Boatology -- Junkomologist
-- Macintosh kinda guy
Friend of Wanda the Wonder Cat, 1991-1997.
_________________________________

[Non-text portions of this message have been removed]

> In a displacement hull, does the sea of peas theory dictate that the
>exit of the hull have the same symmetrical bottom & side "rocker,"
>like the entry?

> So far no one has come up, first hand, of any
> record of PCB on this theory.

Well, I don't have a record, but I did see the essay PCB wrote that
referred to the "sea of peas." :-) He showed it to me about a dozen
years ago during a visit and it was his attempt to explain to the
layperson like me how water flowed around a hull. Rather that use the
term water molecules, he encouraged to the reader to think of the water
as a sea of peas. At least, I recall the vegetable of choice was pease
and I think he did use the phrase sea of peas. My reocllection is he
had submitted the work to WoodenBoat, but they decided not to publish
it. Alas, I don't recall all of the details of the essay, but have
always thought PCB's later writing that talked about getting the bottom
rocker to match the curve of the side were in accordance with what I
way in that essay.

I do remember while we were discussing this theory I mentioned that I
had built a Steve Redmond Elver, which as a completely flat bottom both
fore and aft and athwartship. PCB said according his theory that could
produce some while steering, especially while running, whcih indeed the
boat did. (Although to be fair, I may have also eased the peak sprit
too far forward.) I only wish I had had the presence of mind to ask, as
a friend did later when I relayed this conversation, why PCB used a
dead flat bottom on Dovekie, apparently with good success! ;-)

Gary Blankenship
Tallahassee, Florida

> the sea of peas theory

So far no one has come up, first hand, of any
record of PCB on this theory. The closest I
have heard is a 'third hand account' that it was
discussed in some correspondence between
Jim Michalak and Phil Bolger in the 1980's?

I thing one tricky thing about the visualizing
of water flow as a 'sea of peas' is that the flow
of water is much affected by the sea surface
and also the heel of the boat. Both those
things are very dynamic.

The sides of the boats are closer to the
surface and push it around more than the
bottom does. This is described a little
in Bolger's writing of Clam Skiff in BWAOM.

That sounds exactly right. In a displacement hull,
does the sea of peas theory dictate that the exit of
the hull have the same symmetrical bottom & side
"rocker," like the entry?

--- clydewis <clydewis@...> wrote:

> Could we go back to the "sea of peas" for a short
> time. See if I have
> it right. If I cut out the sides of a Brick, and
> laid them down, top
> to top on a sheet of ply, marked the bottom chine
> line and cut the
> bottom panel, made some temporary frames, bent side
> around bottom and
> frames, installed rub rail to hold shape, would I
> have the ideal
> sharpie bottom? I'm thinking of trying this,
> painting gray and calling
> it "briquette" Clyde
>
>
>

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

--- Inbolger@yahoogroups.com, "clydewis" <clydewis@c...> wrote:

> Could we go back to the "sea of peas" for a short time. See if I have
> it right. If I cut out the sides of a Brick, and laid them down, top
> to top on a sheet of ply, marked the bottom chine line and cut the
> bottom panel, made some temporary frames, bent side around bottom and
> frames, installed rub rail to hold shape, would I have the ideal
> sharpie bottom? I'm thinking of trying this, painting gray and calling
> it "briquette" Clyde

Sounds something like my "Das Brikett" (Black Brick-inspired sailing
pram).

Paul

Could we go back to the "sea of peas" for a short time. See if I have
it right. If I cut out the sides of a Brick, and laid them down, top
to top on a sheet of ply, marked the bottom chine line and cut the
bottom panel, made some temporary frames, bent side around bottom and
frames, installed rub rail to hold shape, would I have the ideal
sharpie bottom? I'm thinking of trying this, painting gray and calling
it "briquette" Clyde