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Effective Planform Wing Shapes

Old 02-22-2008, 02:17 AM
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fr4nk1yn
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Default Effective Planform Wing Shapes

I'm thinking of another design. Sleek, slim and fast.

I've read quite a bit about full sized planes and wing shapes.
But the question is which, if any, wing shape is most effective at our scale?
By that I mean stability, handling, lack of tip stalling.

Since the photos aren't going full size I'll link:
http://www.centennialofflight.gov/es...lane/TH2G5.htm
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Old 02-22-2008, 02:59 AM
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Originally Posted by fr4nk1yn View Post
I'm thinking of another design. Sleek, slim and fast.

I've read quite a bit about full sized planes and wing shapes.
But the question is which, if any, wing shape is most effective at our scale?
By that I mean stability, handling, lack of tip stalling.

Since the photos aren't going full size I'll link:
http://www.centennialofflight.gov/es...lane/TH2G5.htm

First we need to learn low-Reynolds number airfoil design with specific airfoil application.

Be back in 6 months.

Frank
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Old 02-22-2008, 03:19 AM
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How hard could that be? \=
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Old 02-22-2008, 03:51 AM
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Here are a few things to chew on:

http://francisbarnhart.com/projects/mav/MAV_Report.pdf

http://books.nap.edu/openbook.php?re...d=9878&page=39

http://www.elektrofluidsysteme.de/ne...004-final3.pdf

http://www-scf.usc.edu/~tchklovs/Proposal.htm

Frank
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Old 02-22-2008, 02:54 PM
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Originally Posted by fr4nk1yn View Post
I'm thinking of another design. Sleek, slim and fast.

I've read quite a bit about full sized planes and wing shapes.
But the question is which, if any, wing shape is most effective at our scale?
By that I mean stability, handling, lack of tip stalling.

Since the photos aren't going full size I'll link:
http://www.centennialofflight.gov/es...lane/TH2G5.htm

Each one of those wing planforms will have a benefit for some purpose.

How fast is fast?

Are you making a flying wing or delta or a full fuselage plane?

For a plane with a fuselage.
If you're under two hundred miles per hour the standard tapered wing will probably be your best bet as a compromise between stability and speed.

If your not trying to break records then the constant wing will work and be easier to build.
I make my planes mostly built up from balsa, the constant chord is easier for me.

If you build from foam then a tapered wing is no more work. if you're using a hotwire.

The airfoil chosen will have a lot to do with speed or stall characteristics.

Some airfoils will play off their lift slowly and will refuse to drop a wing.
Others will stall sharply followed by the wing drop we all love.

If you look at piston powered general aviation planes, most high performance use the tapered wing.
It also cost more to produce.
If you look at full sized trainer types, you'll see a lot of constant chord wings.
They are cheaper to produce.

If you're looking to build a delta or flying wing, talk to Chellie.

Hope this helped.

Paul
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Old 02-23-2008, 12:26 AM
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This is going to be a fuselage and wing.
I'm thinking elliptical. The Mig-3 I was looking at got me thinking.
Imagine a Spitfire, or Mig-3, without the canopy. Just a sleek fuselage wing and tail.

The delta is good for full size high speed planes but is it REALLY good for our scale and speed compared to a constant chord wing of the same area?

I guess the question is whether there will be any advantage, or disadvantage to an elliptical wing at our size.
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Old 02-28-2008, 05:25 AM
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The book "Mach 1 and Beyond" has a good section on "Development of lift by a wing" that goes into planform shape and their characteristics.

Since high tapered wings tip stall dangerously, like my Mugi did, I'll assume that planform shapes ARE important at our size.

Google Books is our friend (:
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