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


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?


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Old Feb 25, 2013, 07:40 PM
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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
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Why don't you use the multi-panel CG calculator:

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:
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Old Feb 25, 2013, 09:40 PM
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Joined Apr 2002
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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

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Old Feb 25, 2013, 09:56 PM
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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:

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Old Feb 26, 2013, 12:57 AM
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Sweet, thanks guys!
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Old Jan 25, 2015, 03:18 PM
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Joined Dec 2012
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MAC form planform


Here is the software that compute the position and length of the mean aerodynamic chord form a b&w picture of the planform of the wing (or airplane).
This is helpful in case of complex shape like elliptic wings.
You will find the executable, a short guide and some sample planforms.

Please, tell me your feeling about this software.

Best regards

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