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Old Feb 25, 2013, 05:50 PM
person
derp express's Avatar
Joined Dec 2012
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Mean aerodynamic chord for complex wing shapes

Gents,

I'm trying to figure out the MAC for a wing that's comprised of a straight section in the middle with two swept sections on either side. It's constant chord, so relatively simple. I'm just wondering if there's a way I can take the dimensions of the different wing sections (which are known) and compute the location of the MAC to determine where to put the CG?


Regards,

-DE
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Old Feb 25, 2013, 07:40 PM
Registered User
Joined Oct 2004
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You can simply do a weighted average of the MAC for each single panel
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Old Feb 25, 2013, 09:10 PM
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Malaysia, Selangor, Kajang
Joined Jun 2009
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Why don't you use the multi-panel CG calculator:

http://wingcgcalc.bruder.com.br

It's called a flying wing calculator but all it does is find the MAC and draw the CG based on the % you enter. So it's really a generic CG calculator.

Once you've generated your configuration you can ask it to generate a link to your configuration that you can post elsewhere. Here's an example of a wing with straight center section and swept tips:

http://j.mp/ZwoJuf
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Old Feb 25, 2013, 09:40 PM
Red Merle ALES
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United States, Mt, Helena
Joined Apr 2002
5,793 Posts
If you have a spreadsheet program Sailplane Calc may be of interest to you. It will do what you ask for a four panel wing. There is also an article I wrote which explains its use.

Go to the Articles/Files page at www.TailwindGliders.com

Curtis
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Old Feb 25, 2013, 09:56 PM
agnotology
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Joined Jan 2007
3,678 Posts
Or you can use Dan's nice CG calculator spreadsheet that can do up to 9 panels on each wing half, and do a good analysis of the tail and fuse contributions as well:

www.rcgroups.com/forums/showthread.php?t=1106300

Kevin
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Old Feb 26, 2013, 12:57 AM
person
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Joined Dec 2012
160 Posts
Sweet, thanks guys!
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