Thanks for your Help.

>but the cross section shouldn't extend all the way to the tip of the
blade...

You're definitely right, but I made this little study because I had that
silly idea that a blade is nothing else than a dome squizzed in one
direction and elongated in another one, so it went out not so bad and with
very few efforts, and working more on it would mean a lot of work that my
wife is not prepared to support ;-).

Thanks again

Philippe

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