B738 climb fuel burn
Hi folks, wonder if somebody can help me with some Boeing 737 performance calculations.
I need for a research project to show the total fuel use, broken down by segment of flight (take-off, climb, descent, landing) of a typical modern airliner. It doesn't matter very much what airliner, so long as it's something reasonably modern. However I've obtained a B738 performance manual - a type a few people here are familiar with I hope. So I can see 25 lb/min taxi fuel use, 225 lb/hr APU use on the ground. That's easy. I can see tables for take-off fuel as a function of brake release weight, airfield pressure altitude and end speed at 1500ft. All good there. Loads of diagrams for fuel mileage in cruise as a function of speed, weight and altitude. That's straightforward too. I can see data tables for approach idle fuel flow in lb/hr as a function of altitude and ISA deviation. Fine, presumably I just take data at the altitudes it's descending through and do a crude numerical integration. However, I am completely defeated by fuel burn in the climb. I just can't seem to find the data / method in there for calculating fuel burn from end of the take-off segment at 1500ft, to start of the cruise segment at FL-whatever. The data must be buried in here somewhere, but I just can't find my way through the method. Can anybody give me some advice on how to do these calcs? (And incidentally, if anybody can point me at equivalent data I can access for any other modernish airliner, I should be in your debt for that as well). G |
Here's a free 737-300 FPPM.
https://pdfcoffee.com/qdownload/flig...-pdf-free.html Enroute Climb data is shown on pages 3.2.2 to 3.2.6 Enroute Climb The Enroute Climb charts are based on 280/.74 climb speed. Local ATC may require that 250 KIAS not be exceeded below 10000 ft. See Flight Planning Allowances in Chapter 2 for additional fuel burn when this restriction is imposed. Page 2.1.1 Climb Trip Fuel and Time charts are based on 280/.74 climb speed. Local ATC may require that 250 KIAS not be exceeded below 10000 ft. Approximately 45 kg of additional fuel is burned when this restriction is imposed. |
Many thanks eckhard, that has some really useful performance charts in it and might just do the job.
G |
And it did, with a bit of extrapolation. Thanks again.
G |
Airbus FCOM PER-CLB
Climb tables are established at MAX CLIMB THRUST with air conditioning in normal mode and anti-ice OFF. The climb speed profile is : ‐ 250 kt from 1 500 ft up to FL 100 ‐ acceleration from 250 kt to 300 kt ‐ climb at 300 kt then M .78 up to selected altitude. All charts are established with a center of gravity corresponding to 33 %. |
https://cimg7.ibsrv.net/gimg/pprune....98d1e7cb4d.png
PM for detail, more where this came from. You need older editions as the fresh one have the section removed. |
This one has good educative potential, albeit limited to 500 NM. Note MLW = 66.000.
https://cimg1.ibsrv.net/gimg/pprune....8d26a818b5.png |
You’re welcome! Glad to help. Sorry that it wasn’t a -800 manual. Maybe the -800 data is presented in a different way?
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