RE: ARC radius airfoils question....long

From: <upwind120_at_gmail.com>
Date: 31 Oct 2013 07:30:02 -0700

An aside...
 

 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.
 

 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.
 

 a.
 

---In indoor_construction_at_yahoogroups.com, <upwind120_at_...> wrote:

 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.
 

 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.
 

 Art.
 

 

 

 

 

---In indoor_construction_at_yahoogroups.com, <mkirda@...> wrote:

 Am trying to imagine how that conversation would go with the wife...
 
 
 --- In Indoor_Construction_at_yahoogroups.com mailto:Indoor_Construction_at_yahoogroups.com, <ykleetx@...> wrote:
>
> 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
>
 

 
Received on Thu Oct 31 2013 - 07:30:02 CET