Leeboards

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• I m building a Mixer and have been wondering about the leeboard attachment on the gunwale. Specifically, is it strong enough? Call me an engineer, but since
Message 1 of 81 , Aug 20, 2002
I'm building a Mixer and have been wondering about the leeboard
attachment on the gunwale. Specifically, is it strong enough? Call
me an engineer, but since the Mixer has no cross-members from gunwale
to gunwale (one thing that makes it attractive, actually), the
twisting force of the leeboard is taken entirely on the starboard
side panel. Is the extra gunwale strong enough? Will it flop about
like a wet noodle? Anyone with experience with this, not limited to
the Mixer?

Thanks.

Jack
• Yes, you are using just the end of the ellipse to shape the leading edge. ________________________________ From: Anders Bjorklund
Message 81 of 81 , Jun 21, 2013
Yes, you are using just the end of the ellipse to shape the leading edge.

________________________________
From: Anders Bjorklund <andersbjorklund5@...>
To: Michalak@yahoogroups.com
Sent: Friday, June 21, 2013 8:08 PM
Subject: Re: [Michalak] Leeboards

I think I got it. Thanks. It looks like the tangent line back to the 20%
chord would meet the ellipse VERY near its forward tip then. Interesting.

Anders

On Fri, Jun 21, 2013 at 2:10 PM, Samantha Roberts <
samanthaeroberts@...> wrote:

> A 30 deg ellipse is a circle viewed at 30 deg from the plane in which it
> lies (if viewed at 90 deg, it appears as a full circle). This makes a 30
> deg ellipse twice as long as it is wide. So if your plate thickness is 1",
> the ellipse you need to draw is 1" long and 1/2" wide (50% of plate
> thickness).
>
> Now draw a smooth curve that lies tangent to the ellipse and reaches full
> thickness at 20% chord. Since John does not specify either this curve or
> the one from 60% chord to the T.E., I assume he means that those shapes are
> not critical. On the general principle of not trying to make water flow
> around sharp corners, I would make those two curves come smoothly into the
> flat section from 20% to 60% chord, but I am not sure how important that
> might be.
>

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