Re: ARC radius airfoils question....long

From: <mkirda_at_sbcglobal.net>
Date: Thu, 31 Oct 2013 16:24:36 -0000

Just uploading a spreadsheet for converting percentage arcs to radius.
I think it was DonS who posted the formula.

Mike

--- In Indoor_Construction_at_yahoogroups.com, <upwind120@...> wrote:
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> An aside...
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> As a sport flier, I've found it easier to draw an arc of the appropriate radius as a reference, and then match it up to a spot on a ship's curve. Then I can use the curve to make the sliced ribs, with the forward end a bit fuller, like on real airplanes (the difference is so small that it's almost invisible). In addition, the curve can be slipped 1/4 inch over to cut the rib bottoms, and I have instant, painless, banana ribs.
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> I just Googled "ship's curves" to see if they still make them. Sho 'nuff! They're still made by Alvin, and are going for less than $18 for a 6-piece set. I'm sure I paid more than that for my set 50 years ago. They may be all NOS's now.
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> a.
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> ---In indoor_construction_at_yahoogroups.com, <upwind120@> wrote:
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> All the plans I've seen call for a specific radius, not thickness. With a given chord, the longer the radius, the flatter the airfoil. I never knew why they all use a plain arc rather than a more normal airfoil-like curve.
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> I don't know about you, Ren, but links with Reynolds Numbers in them make my eyes glaze over, after a short period of reduction of self-esteem. But we both know that Gabby understands all that stuff and will use it to become a real killer.
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> Art.
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> ---In indoor_construction_at_yahoogroups.com, <mkirda@> wrote:
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> Am trying to imagine how that conversation would go with the wife...
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> --- In Indoor_Construction_at_yahoogroups.com mailto:Indoor_Construction_at_yahoogroups.com, <ykleetx@> wrote:
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> > The Otto Hints contest is in the Salt Mine just before the WC. It is open to all.
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> > > I think I would try the same if I had the chance to fly in that kind of high ceiling site.
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> > > Regards.
> > > Mike Kirda
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Received on Thu Oct 31 2013 - 09:24:38 CET