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Daniel choen

Cost index

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Hey,i am finally can can enjoy the ngx 737, with the new sp1, now i have question about the cost index because i think that what causing my problem.when i am doing a flight and filing the perf page after i fill the index the max cruise altitude is 157, i am filing the cost index with 100, the zfw i am just clicking on the 3L twice and it fills it automatic, so what am i doing wrong how can i make the max altitude be higher? thanks in advance,Daniel(:


Daniel choen

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my flight plane is not always the same(: but i always do shorts flight as i am using vatsim( i need to be next to the computer all the time) so i filled it with 100 as i said earlier, thanks(:


Daniel choen

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I found that using too high of a cost index will have you fly too fast. I use 25 usualy and 30 when in a hurrytongue.pngI guess you could use 100 if there is no wind and you are not afraid of overspeeding the AC. RW ops usualy use around the same as I do.Just my 2 cents


Chris Verner

 

Home cockpit builder ...well trying anyway

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I use 28. I fly NGX in airBaltic livery and I think this is the index they use for their Classics.


Dmitrij Nazarenko

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SWA uses 20 for their cost index. But I've see as low as 8 and up to 74 for different aircraft.


Bryan Bernatek

Commercial Instrument Single Engine and Multi-Engine

CFI ASEL

 

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hey thanks, does it really metter how much index i take? to the altitude?
It does matter for the whole of your flight. CI of 100 is way to much./ Leffe

Leif A Mikkelsen

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If those short hops are too short it may limit your cruise altitude. Try setting up a longer flight with the same payload/fuel to see if it goes up.


Kenneth Weir

My Saitek yoke mod

 

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A CI of 100 is too much for the 737. I use CI 25. GOL Airlines uses 27. I think that even though the CI seems to be low, It doesn't make much difference in speed. It will only vary between M0.78 and .79, .80 perhaps. For flights the 737 usually does, a M0.02 difference in speed doens't make much difference in EET, if at all. The fuel spent when using a high CI doesn't compensates for the 5 minutes, if that much, that you'll gain. And a high CI will give you a heck of a headache on descent, because you'll be going down like a rock. CI 27 will give you a good descent speed, of 267 KIAS.


Matheus Mafra

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If you use a cost index of 100 and then try to descend with VNAV your going to be doing a 330 knot descent. Good luck slowing down! cool.png Example, a cost index of 36 would give you a 280 knot descent which is more reasonable.


Paul Deemer

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I do appreciate that it can be pretty intensive reading, but it's detail like this that makes the study of the manuals SO important and enlightening.I would have to agree that using anything over 80 is waaaaay excessive, and causes many issues, especially on descent.I've settled on 22 and 33


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I started a flight from Wichita, KS to Dallas Love recently and set the cost index at 30. Weather was 25C. Gear up flaps up and autothrottles set at climb power and the 600 would only climb maybe 500 ft/minute at 180 kts. A clean bird at climb power should be going through 10K climbing at 3,000+. Whats the problem?


Happy landings,

 

Mike Eppright (KICT) :Big Grin:

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