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Hi,

I have been wondering about the use of a leeboard on a harryproa. I
know that Rob tried it on one of the small prototypes and had
problems. I was wondering if he (or someone else) could elaborate on
what the issue was, and if they think it was a design/construction
issue, or if there is a fundamental problem with using a leeboard on a
harryproa.

If you will forgive me for belaboring the obvious, the reason I am
considering it is that it seems it would make the rudders much simpler
and more reliable. They could be smaller, and would no longer have to
lift up to provide extra draft. It seems that 2 kickup rudders and a
single asymmetrical lifting (and kickup) leeboard would be simpler and
(possibly) more reliable (although less attractive).

I was just going through David Gerr's "Nature of Boats" and his
description of leeboards seemed to indicate their practicality. I wish
there was a similar book that spent more time with multihulls.

- Gardner
York, PA






Mon Nov 3, 2008 2:23 pm

gardnerpomper
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Message #4595 of 6642 |
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Hi, I have been wondering about the use of a leeboard on a harryproa. I know that Rob tried it on one of the small prototypes and had problems. I was wondering...
gardnerpomper
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Nov 3, 2008
2:24 pm

Hi, I' ve been thinking about using a leeboard on a HP too. We have a lot of boats with leeboards here in the Netherlands, and I have some experience with...
Rudolf vd Brug
rudolfvdbrug
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Nov 3, 2008
9:32 pm

My thought on the rudders was that if they are fairly small, it would be easy enough to have them mounted directly below the beams, near the lee hull, with a...
Gardner Pomper
gardnerpomper
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Nov 3, 2008
10:15 pm

Hello    I am not realy keen on the idea of a leeboard but if I did want one I would think of it more as a supplement to the oversized rudders which might be...
George Kuck
chesapeake410
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Nov 3, 2008
11:21 pm

Well, I plan on having Rob do the design for me too, but one of the things I really like about this forum is how people explore different options. All designs...
Gardner Pomper
gardnerpomper
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Nov 4, 2008
12:14 am

Hello,   Yes, a few other reasons not to use leeboard.  It would get in way when docking or raft up to other boats, the aesthetics and clean lines of boat,...
George Kuck
chesapeake410
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Nov 4, 2008
12:54 am

Gardner, U, the predecessor to the current harry design, had a leeboard and rudders, but Rob has since changed his design. A partial description is here: ...
Mike Crawford
jmichaelcraw...
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Nov 4, 2008
2:10 am

Mike, Thanks for finding those posts. I remember reading them (I believe they were responses to other posts I started <blush> ) but I couldnt find them. At the...
Gardner Pomper
gardnerpomper
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Nov 4, 2008
3:30 pm

G'day, Great threads, guys. Everytime I have something to say, someone beats me to it! Rare Birds rudders are 1.6m/64" deep x 500mm/20" wide. This is 1.8 sq ...
Rob Denney
proaharry
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Nov 5, 2008
12:30 pm

Another rudder question.. do the fore and aft rudders turn together, or in opposite directions? By this I mean, are the rudder blades always parallel to each...
Gardner Pomper
gardnerpomper
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Nov 5, 2008
4:20 pm

Hi, Usually a leeboard is supported by a piece of wood a bit above the waterline to keep it vertical or whatever angle the designer wants it to. Also this...
Rudolf vd Brug
rudolfvdbrug
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Nov 4, 2008
8:21 pm

The rudders on BD can be disconnected. When they are linked together they work in opposite direction, if the front goes left the aft goes right thus the boat...
Rudolf vd Brug
rudolfvdbrug
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Nov 5, 2008
5:48 pm

That is VERY interesting. So, if I understand correctly, the normal operation of the boat is really just one rudder at a time. You don't link them except for...
Gardner Pomper
gardnerpomper
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Nov 5, 2008
6:11 pm

We have the steering lines running through a clutch to be able to use one a leave the other one in fore and aft position. The clutch has a thin line tied to it...
Rudolf vd Brug
rudolfvdbrug
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Nov 5, 2008
6:58 pm

By asymmetric I guess that we could ask about having asymetric hulls not that I'd want to build one, but there wwuld be advantage in leeway resistance. Doug ...
Doug Haines
doha720
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Nov 6, 2008
5:17 am

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