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Old Nov 02, 2004, 12:11 PM
Upstream Racing
Montreal, Canada
Joined Oct 2004
12 Posts
Wing surface area to weight ratio?

Hey folks, is there a wing surface area to weight ratio to go by for a novice scratch builder?

Thanks -Mannes
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Old Nov 02, 2004, 01:02 PM
Registered User
Central California
Joined Aug 2003
1,137 Posts
It's called "wing loading" and is expressed in pounds (or ounces) per square inch of wing area.
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Old Nov 02, 2004, 01:41 PM
Upstream Racing
Montreal, Canada
Joined Oct 2004
12 Posts
Great!!

-thanks Ledbetter... now to the calculator
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Old Nov 02, 2004, 07:52 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Well, for a sailplane, try to get under 10oz/sq'. HL gliders are often in the 4oz/sq' range, but electric powered sailplanes do well to get under 10..
..a
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Old Nov 03, 2004, 01:42 AM
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Fredrik W's Avatar
Stockholm, Sweden
Joined Jul 2002
1,249 Posts
If you see a kit from european manufacturers you will most likely see the wingloading expressed in g/dm2 (grams per square decimeter), to transform g/dm2 => oz/sq.ft, just multiply g/dm2 with 3,04.


// Fredrik Wergeland
Sweden
www.flyingmodels.org
The Great Electric Motor Test
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Old Nov 06, 2004, 03:28 AM
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Peytr's Avatar
The Netherlands
Joined Sep 2004
282 Posts
Hi Fredrik,

I think you made a mistake. It's g/dm2 / 3.04 > Oz/sq.ft. Correct me if I'm wrong .

My scratch built E soarer is in the range of 22g/dm2 (7.2 Oz/sq.ft) and is all composite. By using Lipo's it will be lowered to 19g/dm2 (6.25 oz/sq.ft). These numbers are a kind of ambitious but possible. Work with a weight budget for the whole frame and all separate parts. With the weight budget at one end of the workbench and a precision scales on the other you can get down to 6 oz/sq.ft if you reject enough heavy stuff .
Select wood, select your RC gear, select covering. For short: Select everything on it's weight and do a balancing act before fitting the battery etc. You'll save ballasting weight this way as well.
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Old Nov 06, 2004, 01:59 PM
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Fredrik W's Avatar
Stockholm, Sweden
Joined Jul 2002
1,249 Posts
I stand corrected! Thanks.


// Fredrik Wergeland
Sweden
www.flyingmodels.org
The Great Electric Motor Test
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