AA 737-800
Topic Author
Posts: 176
Joined: Wed May 19, 1999 6:26 am

Idle Fuel Burn Rates

Wed Mar 22, 2006 12:55 pm

Does anyone know the approximate fuel burn rate at idle and at cruise for any common civil jet engines? Anything like RB211, CF6, CFM56, GE90, etc. would be greatly appriated. If no one knows, does anyone know who I might e-mail at the engine manufacturers for these facts? Thanks for all your help.
Civil engineering isn't about making things perfect...just better.
 
Doktor
Posts: 29
Joined: Tue Mar 21, 2006 10:50 pm

RE: Idle Fuel Burn Rates

Thu Mar 23, 2006 2:36 am

Hi! I found something of 2.650-3.000 l/h for the CFM56 in cruise. But normally the rate is given in specific-fuel-consumption, which is calculated with kg/h/kN and data refers to TO --> max thrust (CFM56: 37,5kg/h/kN at 104.5kN). Due to the fact that the thrust depends on so many atmospheric conditions, your question is not that easy to answer...

Dok
 
UAL Bagsmasher
Posts: 1839
Joined: Wed Sep 08, 1999 12:52 pm

RE: Idle Fuel Burn Rates

Fri Mar 24, 2006 6:29 am

The GE CF34-3B1 used on the CRJ-200 burns around 400lb/hr/engine at idle.
 
CYEGsTANKERS
Posts: 234
Joined: Fri Oct 15, 2004 8:01 am

RE: Idle Fuel Burn Rates

Sat Mar 25, 2006 11:27 am

Quoting UAL Bagsmasher (Reply 2):
The GE CF34-3B1 used on the CRJ-200 burns around 400lb/hr/engine at idle.

The GE CF-34-8C1 on the CRJ-700, is that a close amount compared to the 200 for burning idle fuel?

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CCA
Posts: 769
Joined: Wed Oct 02, 2002 7:29 pm

RE: Idle Fuel Burn Rates

Sat Mar 25, 2006 12:06 pm

CF6-50 depending on aircraft weight 3,000-3,500 Kg/hr in the cruise, an RB211-524D4 is about 250kg/hr less. Just estimates off the top of my head will have to get back to you for idle.
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UAL Bagsmasher
Posts: 1839
Joined: Wed Sep 08, 1999 12:52 pm

RE: Idle Fuel Burn Rates

Sun Mar 26, 2006 8:14 am

cYEGsTankers, I am not familiar with the -8C1's, as my airline only flies the CRJ-200's. Sorry!
 
rsbj
Posts: 105
Joined: Sun Jan 29, 2006 4:49 am

RE: Idle Fuel Burn Rates

Sun Mar 26, 2006 3:48 pm

All CFM56's burns 650-700 lb/hr/engine at sea level with bleeds open.
I fly really fast and take a lot of chances.
 
Doktor
Posts: 29
Joined: Tue Mar 21, 2006 10:50 pm

RE: Idle Fuel Burn Rates

Tue Mar 28, 2006 6:34 pm

Found some more, these dates are stated as averages for the aircraft:

Concorde 4x RR/Snecma Olympus 593 (170kN): 25.629l/h
747-400 4x (different engines): 12.500l/h
767-300 2x (different engines): 5.800l/h
757-200 2x (different engines): 4.000l/h
737-400 2x CFM56-3C1: 2.850l/h
A340-300 4x CFM56-5C2: 8.300l/h
A310-300 2x GE CF6-80C2A2: 5.250l/h
A320-200 2x CFM56-5A1: 2.900l/h

I wouldn't trust these dates that much though...
 
schooner
Posts: 138
Joined: Wed Oct 31, 2001 10:29 pm

RE: Idle Fuel Burn Rates

Fri Mar 31, 2006 2:27 am

RB-211 between approx 1.5 - 2.2 tonnes/hour depending on aircraft weight, cruise speed etc.

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phollingsworth
Posts: 635
Joined: Sat Mar 06, 2004 6:05 am

RE: Idle Fuel Burn Rates

Fri Mar 31, 2006 5:44 am

A GE90-92B with a DACII combustor burns 0.302 kg/s of fuel. It produces 0.37g of unburned hydrocarbons, 12.35 g of CO, and 5.92 g of NOx per kg of fuel burned at certification idle (7% of TO thrust). These are the certification numbers and an actual engine will probably do worse. The same engine burns 3.515 kg/s of fuel and produces 0.04 g HC, 0.15 g CO, and 55.9 g NOx per kg of fuel at the takeoff thrust of 426.72 kN.

This data is all available in the ICAO emissions databank:
http://www.caa.co.uk/default.aspx?categoryid=702&pagetype=90
 
flyboy80
Posts: 1812
Joined: Fri Jul 13, 2001 8:10 am

RE: Idle Fuel Burn Rates

Sat Apr 01, 2006 1:46 am

how much does a gal of jet fuel weigh? Is 8lbs used to formulate weight and balance?
 
doug_or
Posts: 3118
Joined: Sat Mar 18, 2000 9:55 am

RE: Idle Fuel Burn Rates

Sat Apr 01, 2006 1:53 am

6.7 lbs/gallon

FWWIW PW120A burns 260 @ normal idle and around 160 when feathered.
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