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CoG?

Old 05-12-2019, 11:04 PM
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trying2fly
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Default CoG?

When using a "wing CoG calculator...where on the wing do you measure the "chord"? thanx!
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Old 05-13-2019, 01:23 AM
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Jools
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The GofG position must be calculated from the wing AREA. E.g. 28% of the AREA should be AHEAD of the CofG point, and 72% of the area should be BEHIND the CofG. I'll use 28% as a very realistic example).
For a simple wing planform like a simple taper:
Measure the halfway point of one wing (span-wise). Make a line from LE to TE parallel with the wing root at that point.
On this line measure 28% back from the leading edge. Mark this point.
Make a line from this point to the wing root at right angles to this line and the wing root.
Balance the aircraft on this point. That will be 28% of the Mean Chord.
Swept wings and more complex wing planforms will need a different method.
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Old 05-13-2019, 01:45 AM
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trying2fly
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Originally Posted by Jools View Post
The GofG position must be calculated from the wing AREA. E.g. 28% of the AREA should be AHEAD of the CofG point, and 72% of the area should be BEHIND the CofG. I'll use 28% as a very realistic example).
For a simple wing planform like a simple taper:
Measure the halfway point of one wing (span-wise). Make a line from LE to TE parallel with the wing root at that point.
On this line measure 28% back from the leading edge. Mark this point.
Make a line from this point to the wing root at right angles to this line and the wing root.
Balance the aircraft on this point. That will be 28% of the Mean Chord.
Swept wings and more complex wing planforms will need a different method.
Thank you so very much!!!!!!!!!!!!!!!!!!
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Old 05-13-2019, 07:45 AM
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Wildflyer
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The chord of a wing is simply the total leading edge to trailing edge distance measured parallel to the centerline of the fuselage.
Measured at the center of wing gives you the root chord, measure at tip gives you the tip chord.

Then you can make a search for a good CG calculator.
Here is just 1 --- https://www.google.com/url?sa=t&rct=...cgFKeO6bDV52VK
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Old 05-13-2019, 02:47 PM
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trying2fly
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thanx a lot...that was what I was after!!!!
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Old 05-13-2019, 02:58 PM
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solentlife
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Just to add a bit (not necessary for a flying wing) ... but for later reference ...

Root Chord is the Leading Edge to Trailing edge measurement of a wing in cruise mode without flaps / slats extended ... and measure where wing joins the fuselage minus any extensions for jet intakes etc.

Just commenting ...
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