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| Fuel Consumption http://jkpeterson.net/forum/viewtopic.php?f=6&t=1926 |
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| Author: | Ali [ Mon Sep 14, 2009 18:58 pm ] |
| Post subject: | Fuel Consumption |
hey i need to use this information for fighters anthology: Mirage 5 SNECMA Atar Engine: # Specific fuel consumption: * 103 kg/(kN·h) or (1.01 lb/(lbf·h)) military power * 207 kg/(kN·h) or (2.03 lb/(lbf·h)) with afterburner what will this be in terms of lbs/s ?? thanks |
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| Author: | KAPTOR [ Thu Sep 17, 2009 14:22 pm ] |
| Post subject: | Re: Fuel Consumption |
Multiply your lbf.h x thrust divide by 60 x number of engines. |
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| Author: | Ali [ Thu Sep 17, 2009 21:16 pm ] |
| Post subject: | Re: Fuel Consumption |
KAPTOR wrote: Multiply your lbf.h x thrust divide by 60 x number of engines. thanks for the reply kap but im still lost a bit. so if im to calculate fuel consumption in lb/s at full thrust: now 2.03 x 13,240 x 1 hour = 26877.2 lb of fuel needed to provide 13k of thrust in 1 hour??? meaning 447lb of fuel / second ???? O.o is this correct? |
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| Author: | Zephyr [ Thu Sep 17, 2009 21:54 pm ] |
| Post subject: | Re: Fuel Consumption |
Divide by 3600 rather than 60. So this engine works out to 7.466 lbs burned per second at afterburner. Assuming this "Mirage aircraft" has 9,000 lbs of fuel, it can run maximum afterburner for 20 minutes before emptying a full fuel tank. Sounds reasonable? |
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| Author: | Ali [ Thu Sep 17, 2009 22:39 pm ] |
| Post subject: | Re: Fuel Consumption |
oh ya i just got that. thanks zephyr. and i dont think its reasonable lol. GE J79 11,905(lbf) x 0.85 lb/(h·lbf) / 3600 = 2.81 lb/s of fuel 17,835 lbf x 1.965 lb/(h.bf) / 3600 = 9.73 GE F110 17,155 (lbf) x 0.73 lb/(h·lbf) / 3600 = 3.47 28,000 (lbf) x 2.06 lb/(h.lbf) /3600 = 16.02 RD-33 11,230 lbf x 0.77 lb/(h.lbf) / 3600 = 2.40 18,285 lbf x 2.05 lb/(h.lbf) / 3600 = 10.41 SNECMA Atar 9,440 lbf x 1.01 lb/(h.lbf) / 3600 = 2.64 13,240 lbf x 2.03 lb/(h.lbf) /3600 = 7.46 GE J85 used F-5E 5000 x 2.13 / 3600 = 2.95 lb /s clearly the Atar engine for the Mirage 5 is the worst in terms of efficieny and power. but then again they are very light aircraft, still doesnt explain the inefficiency in the engines. The GE F110 seems very very efficient on dry thrust. but it has the disadvantage of size. The GE j85 for the f-5 seems pretty decent. |
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| Author: | CAG Hotshot [ Fri Sep 18, 2009 15:18 pm ] |
| Post subject: | Re: Fuel Consumption |
Ali wrote: oh ya i just got that. thanks zephyr. and i dont think its reasonable lol. ... You forgot to factor in drag, which overcoming consumes a large portion of the fuel at burner... |
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| Author: | KAPTOR [ Sat Sep 19, 2009 03:41 am ] |
| Post subject: | Re: Fuel Consumption |
CAG Hotshot wrote: Ali wrote: oh ya i just got that. thanks zephyr. and i dont think its reasonable lol. ... You forgot to factor in drag, which overcoming consumes a large portion of the fuel at burner... Drag has nothing to do with fuel burn rate, only the performance you get out of it. The ATAR is a very old engine more comparable to the J79 than the other engines listed. Just generally speaking, the larger the engine, the more efficient it is. |
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| Author: | CAG Hotshot [ Sun Sep 20, 2009 01:03 am ] |
| Post subject: | Re: Fuel Consumption |
KAPTOR wrote: CAG Hotshot wrote: Ali wrote: oh ya i just got that. thanks zephyr. and i dont think its reasonable lol. ... You forgot to factor in drag, which overcoming consumes a large portion of the fuel at burner... Drag has nothing to do with fuel burn rate, only the performance you get out of it. The ATAR is a very old engine more comparable to the J79 than the other engines listed. Just generally speaking, the larger the engine, the more efficient it is. I wasnt responding to the fuel rates, which is why I deleted them from the quote. I was responding to his not thinking the performance of the mirage aircraft was reasonable, which it isnt, until one factors in its drag... |
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| Author: | usnraptor [ Thu Nov 28, 2013 10:58 am ] |
| Post subject: | Re: Fuel Consumption |
Here is a website that list jet engines with their thrust values and specific fuel consumption. [url]http://www.jet-engine.net/miltfspec.html[/url] (I know this is an old thread, but is a recent project for me.) Speaking of list, does anyone have a list for man-hours maintenance for aircraft? |
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| Author: | Kai [ Fri Dec 06, 2013 17:54 pm ] |
| Post subject: | Re: Fuel Consumption |
Thanks for posting that raptor. I'm working on a lib and was looking for accurate engine outputs. (especially for the F-14A vs. the F-14B and D) |
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