Subject: Re: [harryproa] Leeboards?
From: George Kuck
Date: 11/3/2008, 6:21 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

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 slightly downsized but still capable of working as originally planned.  The leeboard would not be the traditional type but a daggerboard case leeboard. The case would pivot but the daggerboard could be set at whatever depth was needed for the conditions and depth of water, or it may be a short board used to supplement daggerboard rudders when they are set for shallow water.  The leeboard may also give you some redundancy if one rudder should fail, you may be able to continue sailing on one rudder and leeboard.   
 
My main problem with the addition of a leeboard is the added complexity, cost, building time and it is just one more thing to have to deal with when sailing.  If the Harryproa works as Rob designs it why make more work.  One of the main attractions of the Harryproa is the Easy Rig.  Keep it easy and do not make it more complicated even it it may give you a extra 1/10 th knot.
 
When I am ready to build I will just pay Rob for the plans and trust his design.  That's why you pay him, why try to redesign it.  If it does not work then you can blame him but it appears that the Harryproa concept does work.  I expect that the design can be refined over time but I would not make radical changes to it. 
 
Happy sailing,
George Kuck
Chestertown,MD 
 
      

--- On Mon, 11/3/08, Rudolf vd Berg <rpvdb@freeler.nl> wrote:
From: Rudolf vd Berg <rpvdb@freeler.nl>
Subject: Re: [harryproa] Leeboards?
To: harryproa@yahoogroups.com.au
Date: Monday, November 3, 2008, 4:32 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 them.
You would have to use a fore and aft symmetric profile which is not perfect. Also I am not sure how they work at higher speed. 
The attachment to the hull would be right next to the mast where it strong already.
 
My reason for taking leeboards into account was the same as yours: have simpler and less vulnerable rudders.
On BD sailing with both rudders down the front rudder is hanging loose in it's casing.
The aft rudder is highly loaded. So I figured having a leeboard with some length and pull it aft to to balance the boat and steer with a rudder as small as possible.
But where to put those small rudders?
 
Rudolf
 
 
 
 
 
----- Original Message -----
Sent: Monday, November 03, 2008 3:23 PM
Subject: [harryproa] Leeboards?

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 kick up rudders and a
single asymmetrical lifting (and kick up) leeboard would be simpler and
(possibly) more reliable (although less attractive).

I was just going through David Carr'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


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