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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