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767 Captain (FSX) >> 767 Captain (FSX) >> How do I work out the CG and Cost Index? https://www.captainsim.org/forum/csf.pl?num=1261500407 Message started by Junior87 on Dec 22^nd, 2009 at 4:46pm

Title: How do I work out the CG and Cost Index?
Post by Junior87 on Dec 22^nd, 2009 at 4:46pm

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

Title: Re: How do I work out the CG and Cost Index?
Post by aceridgey on Dec 22^nd, 2009 at 7:49pm

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

Title: Re: How do I work out the CG and Cost Index?
Post by taech on Dec 23^rd, 2009 at 3:54am

Hi
Try this link for the CG
http://www.captainsim.org/yabb2/YaBB.pl?num=1220997876

Title: Re: How do I work out the CG and Cost Index?
Post by Junior87 on Dec 23^rd, 2009 at 9:18am

Thanks very much for your help

Title: Re: How do I work out the CG and Cost Index?
Post by phoenix on Aug 8^th, 2010 at 12:11pm

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.

Title: Re: How do I work out the CG and Cost Index?
Post by phoenix on Aug 10^th, 2010 at 7:09am

Anyone for CG calculation? ::)

Title: Re: How do I work out the CG and Cost Index?
Post by mbucholski on Aug 10^th, 2010 at 9:02am

Just use 37-39% and it should be fine.

Title: Re: How do I work out the CG and Cost Index?
Post by Tim Capps on Aug 10^th, 2010 at 11:48am

Or 22-24 :-)

Title: Re: How do I work out the CG and Cost Index?
Post by DAL 191 on Aug 11^th, 2010 at 5:00am

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

Title: Re: How do I work out the CG and Cost Index?
Post by phoenix on Aug 12^th, 2010 at 6:29pm

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)

Title: Re: How do I work out the CG and Cost Index?
Post by mbucholski on Aug 13^th, 2010 at 9:32am

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...).

Title: Re: How do I work out the CG and Cost Index?
Post by 0Artur0 on Nov 24^th, 2010 at 12:23pm

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.