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How do I work out the CG and Cost Index? (Read 16666 times)

Junior87 New Member Offline Posts: 4 Joined: Nov 19^th, 2009	How do I work out the CG and Cost Index? Dec 22^nd, 2009 at 4:46pm	Print Post
	Hello everyone, Merry Christmas and Happy New Year. Is anyone able to help me work out what figures I need to put into the fields CG and in the field of Cost Index. Thanks


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aceridgey Full Member Offline Posts: 194 Location: Leeds, United Kingdom Joined: May 23^rd, 2009 Gender:	Re: How do I work out the CG and Cost Index? Reply #1 - Dec 22^nd, 2009 at 7:49pm	Print Post
	hi mate, I cant tell you about the CG trim However, Cost index is basically a link to fuel consumtion, the higher the value, the faster the aircraft climbs, and cruises [ unless you over wright them in the FMC] A benchmark is around 100-200 i would say, British airways and alot of airlines are down really low atm, becuase of fuel prices!! BA Use 0 as a cost index for there east bound atlantic flights HOpe this helps Alex


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taech Full Member Offline Posts: 22 Location: Auckland, NZ Joined: Dec 5^th, 2009	Re: How do I work out the CG and Cost Index? Reply #2 - Dec 23^rd, 2009 at 3:54am	Print Post
	Hi Try this link for the CG http://www.captainsim.org/yabb2/YaBB.pl?num=1220997876

	767-300&&http://www.captainsim.com/user/dl/b767/b767fcaptain.jpg&&757-200&&http://www.captainsim.com/user/dl/c131/c131_captain.gif
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Junior87 New Member Offline Posts: 4 Joined: Nov 19^th, 2009	Re: How do I work out the CG and Cost Index? Reply #3 - Dec 23^rd, 2009 at 9:18am	Print Post
	Thanks very much for your help


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phoenix Full Member Offline 757 enthusiast Posts: 74 Location: Moscow, UUEE Joined: Nov 22^nd, 2005 Gender:	Re: How do I work out the CG and Cost Index? Reply #4 - Aug 8^th, 2010 at 12:11pm	Print Post
	This calculation of CG is not applicable for 767! The value 13, for example may cause 0.5 for trim setting, it's incorrect denotation for take-off. Therefore it another variant should, but I'm myself looking for it.

	Best regards, Stanislav&&http://www.avsim.su/&&&&;
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phoenix Full Member Offline 757 enthusiast Posts: 74 Location: Moscow, UUEE Joined: Nov 22^nd, 2005 Gender:	Re: How do I work out the CG and Cost Index? Reply #5 - Aug 10^th, 2010 at 7:09am	Print Post
	Anyone for CG calculation?

	Best regards, Stanislav&&http://www.avsim.su/&&&&;
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mbucholski Full Member Offline Posts: 142 Location: Kolobrzeg, Poland Joined: Feb 20^th, 2010 Gender:	Re: How do I work out the CG and Cost Index? Reply #6 - Aug 10^th, 2010 at 9:02am	Print Post
	Just use 37-39% and it should be fine.


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Tim Capps Senior Member Offline Defense Lawyer & US Navy JAG (ret), Writer Posts: 1070 Location: Southern Illinois Joined: May 21^st, 2009	Re: How do I work out the CG and Cost Index? Reply #7 - Aug 10^th, 2010 at 11:48am	Print Post
	Or 22-24

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DAL191 Senior Member Offline Posts: 388 Location: Tampa FL USA Joined: Nov 26^th, 2009 Gender:	Re: How do I work out the CG and Cost Index? Reply #8 - Aug 11^th, 2010 at 5:00am	Print Post
	I use the default value in the FMC. I think its 25% for the 767 and 27% for the 757. That seems to work fine. Michael Cubine

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phoenix Full Member Offline 757 enthusiast Posts: 74 Location: Moscow, UUEE Joined: Nov 22^nd, 2005 Gender:	Re: How do I work out the CG and Cost Index? Reply #9 - Aug 12^th, 2010 at 6:29pm	Print Post
	But these values can be changed manually, correct? So, there is some formula to calculate it should be, and because this value can be changed it should be depend of something. That's �what I need to understand and find this formula for correct calculations. Dear CS staff, could you please advice and explain somethig for this case? You wrote in manual about this feature, for what it needed, but how to do it - there is nothing. Please clarify asap. (Part V of Flight Manual, p.47, ent. 8 for CRZ CG, p.49 ent. 5 for TO CG)

	Best regards, Stanislav&&http://www.avsim.su/&&&&;
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mbucholski Full Member Offline Posts: 142 Location: Kolobrzeg, Poland Joined: Feb 20^th, 2010 Gender:	Re: How do I work out the CG and Cost Index? Reply #10 - Aug 13^th, 2010 at 9:32am	Print Post
	I used 25 for T/O CG on my last flight and it gave a ridiculous (in my belief) trim of 4 and something. The acft basically took off itself after Vr. I really don't think the 767 needs ANU settings close to a MD-11 (and I like to rotate when I want to, not when the acft does...).


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0Artur0 Full Member Offline Posts: 11 Location: Slovenia Joined: Aug 20^th, 2009	Re: How do I work out the CG and Cost Index? Reply #11 - Nov 24^th, 2010 at 12:23pm	Print Post
	phoenix wrote on Aug 12^th, 2010 at 6:29pm: Dear CS staff, could you please advice and explain somethig for this case? You wrote in manual about this feature, for what it needed, but how to do it - there is nothing. Please clarify asap. I guess silence answers your question.

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