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767 Captain II (P3D4) >> 767 Captain II - General >> Cost index calculation https://www.captainsim.org/forum/csf.pl?num=1598229895 Message started by Alex T on Aug 24^th, 2020 at 12:44am

Title: Cost index calculation
Post by Alex T on Aug 24^th, 2020 at 12:44am

Surely something is wrong here. At my company we use a CI of 15 on the 757/767 if we're on-time, 350 if late. I was using 15 and my ECON speed seemed just too high. The OFP predicted one of .787 and the plane was giving me .80

To test I entered a bunch of cost indexes to see if it'd react realistically, it did not. When I entered a lower cost index of 0, it gave me a higher cruise speed! :o then it wouldn't even give a higher speed until I threw in 5000.

Also, not sure why with the CI of 0 the ECON speed changes from MACH to IAS?!

And why is the ACT ECON CRZ turning into ACT LIM SPD CRZ with any higher cost index than 35?

I understand what the maximum entries for the 767 cost index, but the results are different than what they were before the last few hotfixes.

https://imgur.com/uID9DPp
https://imgur.com/lHsXYLo
https://imgur.com/IrZKTN6

Title: Re: Cost index calculation
Post by Angel of Attack on Sep 2^nd, 2020 at 5:10am

Just for information, CI vs speed (and weight, alt, etc...) chart is in "FMC Supplementray Performace Data for the Model (767 etc..)" doc. which is NOT in a standard flight manual, FCOM and FPPM only provide data for .80 and LCR.
I see some other add-ons specify list they have "full CI system simulated"

Title: Re: Cost index calculation
Post by Alex T on Sep 2^nd, 2020 at 8:53pm

Angel of Attack wrote on Sep 2^nd, 2020 at 5:10am:

So nowhere to get this data? I swear it wasn't an issue before. I just tested again (v1.0) and the climb speed looked normal 0.784, and cruise was still 0.80 :(

Title: Re: Cost index calculation
Post by Angel of Attack on Sep 25^th, 2020 at 6:49am

Well, I have noticed the same on 757, CLB and DES speed are following CI change, but CRZ is LOCK to .800, that's odd, doesn't seems they lack data, but rather a bug prevent the CRZ mode to work proprelly

Title: Re: Cost index calculation
Post by Alex T on Oct 6^th, 2020 at 9:18pm

CS, any word on this? Again, I'm having a CI of 70, then putting in 15 and the plane is accelerating?!

2020-10-6_17-15-12-9.jpg ( 894 KB | 117 Downloads )

Title: Re: Cost index calculation
Post by Alex T on Jan 26^th, 2021 at 4:13pm

So no answer from the devs? Not even a "well look into it"? Or the usual answers? It's been a quiet few months here. :-? :(

Title: Re: Cost index calculation
Post by Captain Sim on Jan 26^th, 2021 at 6:55pm

We'll check that and a few other things on the Base Pack by the -300F Expansion release.