SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Jan 21, 2013, 08:24 AM
Registered User
Joined Aug 2009
1,317 Posts
Discussion
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
Chuchuf is offline Find More Posts by Chuchuf
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 21, 2013, 09:00 AM
Up-Out-&-Gone
demondriver's Avatar
Charelston SC U.S.A.
Joined Mar 2007
15,827 Posts
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.
demondriver is offline Find More Posts by demondriver
RCG Plus Member
Old Jan 21, 2013, 11:07 AM
Registered User
Joined Aug 2009
1,317 Posts
Thanks Demon. That's what I was thinking of using.
Are you generally starting with 20-25%?

Thanks,

Terry
Chuchuf is offline Find More Posts by Chuchuf
Reply With Quote
Old Jan 21, 2013, 11:29 AM
Up-Out-&-Gone
demondriver's Avatar
Charelston SC U.S.A.
Joined Mar 2007
15,827 Posts
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.
demondriver is offline Find More Posts by demondriver
RCG Plus Member
Old Jan 21, 2013, 11:47 AM
Registered User
Joined Aug 2009
1,317 Posts
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
Chuchuf is offline Find More Posts by Chuchuf
Reply With Quote
Old Jan 21, 2013, 10:40 PM
Up-Out-&-Gone
demondriver's Avatar
Charelston SC U.S.A.
Joined Mar 2007
15,827 Posts
Terry upon studying the Gulstream's wing I would say that This should be your CG "strike-Zone" for this aircraft.
demondriver is offline Find More Posts by demondriver
RCG Plus Member
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Where to find larger tail blade ... Spirittoo Coaxial Helicopters 6 Jan 20, 2013 06:06 PM
Discussion Where to find scale prop for my 60 Corsair? shamrock1990 Fuel Plane Talk 6 Jan 17, 2013 07:27 AM
Discussion Sbach 342 3D - Finding COG with different batteries? Rattler888 Micro Ready-to-Fly 13 Jan 09, 2013 09:53 AM
Help! How much does the feathering shaft need to be bent to necessitate replacement? B450guy Electric Heli Talk 5 Jan 05, 2013 10:25 AM