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Old Jan 21, 2013, 09:24 AM
Chuchuf is offline
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How to find where COG needs to be


I have a Gulfstream G650 that was built by someone else that I need to determine the CG on.
Being that it is an airliner shape and you guys are scratch building these, I thought I would check here first.
Did a quick search and didn't see anything, so sorry if this has already been discussed.
I have some ideas but just want to confirm.

Thanks in advance for any help or pointers.

Terry
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Old Jan 21, 2013, 10:00 AM
demondriver is offline
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Quote:
Originally Posted by Chuchuf View Post
I have a Gulfstream G650 that was built by someone else that I need to determine the CG on.
Being that it is an airliner shape and you guys are scratch building these, I thought I would check here first.
Did a quick search and didn't see anything, so sorry if this has already been discussed.
I have some ideas but just want to confirm.

Thanks in advance for any help or pointers.

Terry

Hi Terry there's always these online CG calculators!

http://www.grc.nasa.gov/WWW/k-12/airplane/cg.html

http://www.nasascale.org/howtos/cg-calculator.htm

Just be sure to enter the most reliable numbers you can or the CG equation will be wrong.
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Old Jan 21, 2013, 12:07 PM
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Thanks Demon. That's what I was thinking of using.
Are you generally starting with 20-25%?

Thanks,

Terry
Old Jan 21, 2013, 12:29 PM
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Quote:
Originally Posted by Chuchuf View Post
Thanks Demon. That's what I was thinking of using.
Are you generally starting with 20-25%?

Thanks,

Terry
Yes 20-25% is fine, But that's on a "Non-swept" wing aircraft . . . . . .things change when there is significant wing sweep.
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Old Jan 21, 2013, 12:47 PM
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Ah but of course. This being a Gulfstream G650 it was a swept wing.
What are the calcs and general rules in that case??

Terry
Old Jan 21, 2013, 11:40 PM
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Terry upon studying the Gulstream's wing I would say that This should be your CG "strike-Zone" for this aircraft.
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