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## Re: [Michalak] Leeboards

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• Make the leading edge a nice 30 deg ellipse about 50% of the plate thickness, bring that to full thickness at about 20% chord Trying to figure out how to go
Message 1 of 81 , Jun 21, 2013
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"Make the leading edge a nice 30 deg ellipse about 50% of the plate
thickness, bring that to full thickness at about 20% chord"

Trying to figure out how to go about that. I get the 20% chord, but not how
to draw a "30 degree ellipse about 50% of plate thickness". Anybody know
offhand? Otherwise, I'll keep Googling ...

Anders

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• 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
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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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