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While the pictures show one side of the fins being sanded, here's what the leading edge would look like. As mentioned before, I don't sand to a knife edge but leave the top a little square for strength.
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Start flattening out the top and bottom surfaces of the fin. You'll be removing the pencil line areas shown in the last blog entry picture.
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There is no way to avoid this and it will make the outside edge a little thinner than the root edge, just like the real HoJo fins.
The pencil tick mark at the left shows where the sanded taper took off the pencil line.
When you sand the lower face flat, the high point line will again follow the pencil line to the outside edge.
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