What engine has the higest bypass ratio?

[Justforkix]

What engine has the highest bypass ratio?

Well?

[gas path]

GE90 at 8.4:1

[Lost_luggage34]

Thought it was the later versions of the RB211 i.e. as fitted to the 744 ?

[gas path]

Nah!! RB211-524h is 4.3:1

[Lost_luggage34]

Blimey - interesting stuff. Thanks gas path.

[twistedenginestarter]

GE90-90B 9.0:1
Trent 500 7.6:1

[Zeke]

GEN ELEC-GE 90-85B (e.g. B777) by pass ratio 8.4
P & W--PW4084 (e.g. B777) by pass ratio 6.41
CFMI-CFM 56-5C2 (e.g. A340) by pass ratio 6.4
CFMI-CFM 56-5A1 (e.g. A320) by pass ratio 6
P & W--PW2037 (e.g. 757-200) by pass ratio 6
RR-TRENT-890 (e.g. B777) by pass ratio 5.74
ALLIEDSIG--ALF502R-5 (e.g. BA146-100) by pass ratio 5.7
ALLIEDSIG--LF507 (e.g. BA146-300) by pass ratio 5.6
ZMKB --D-18T (e.g. AN-124) by pass ratio 5.6
GEN ELEC-CF6-80C2-B2 (e.g. B767-200ER) by pass ratio 5.31
GEN ELEC-CF6-80E1A2 (e.g. A330) by pass ratio 5.3
GEN ELEC-CF6-80C2-B1F (e.g. B 747-400) by pass ratio 5.15
P & W--PW4168 (e.g. A330) by pass ratio 5.1
GEN ELEC-CF6-80C2-A5 (e.g. A300-600R) by pass ratio 5.05
ZMKB--D-436T1 (e.g. Tu-334-1) by pass ratio 4.95
RR-TRENT-772 (e.g. A330) by pass ratio 4.89
P & W--PW4056 (e.g. B767-300) by pass ratio 4.85
CFMI-CFM 56-3C1 (e.g. B737-400) by pass ratio 4.8
IAE--V2525-D5 (e.g. MD-90-10) by pass ratio 4.8
BMW:RR--15-55 (e.g. ) by pass ratio 4.7
JASC AVIA--PS-90A (e.g. IL-96-300) by pass ratio 4.6
RR-RB-211--524H (e.g. B747-400) by pass ratio 4.3
RR-RB-211--535E4/E4-B (e.g. B757-200) by pass ratio 4.3
BMW:RR-BR 7-17807 (e.g. Gulfstream V) by pass ratio 4
WILL: ROLLS--FJ44 (e.g. CitationJet) by pass ratio 3.28
RR-TAY-651 (e.g. some re-engined 727s) by pass ratio 3.07
RR-TAY-620 (e.g. Fokker 100) by pass ratio 3.04
JASC AVIA--D-30KU II (e.g. Tu-154M) by pass ratio 2.42
P & W--JT8D-219 (e.g. MD-80) by pass ratio 1.72
RR-RB 183-555-15P (e.g. F28 Mk4000) by pass ratio 0.71
RR-SPEY- 511-8 (e.g. Gulfst. II) by pass ratio 0.64
RR-CONWAY-301 (e.g. Super VC10) by pass ratio 0.42

[gas path]

Well to just about complete the worlds engine fleet of bypass ratios...........we have.....
P & W jt9d-3a and -7 at 5.0:1
GE CF6-50 at 4.2:1
RR RB211-22b at 5.0:1
RR RB211-524c2 at 5.0:1
RR RB211-524d4 at 4.311:1 (a bit less than it's sisters due to a bigger diameter L.P turbine).

[SRR99]

GE 36 - 30ish:1 reputedly

OK, so it was never produced commercially.

[lomapaseo]

>RR RB211-524d4 at 4.311:1 (a bit less than it's sisters due to a bigger diameter L.P turbine).<

OK, you got me here



Why does a bigger dia L.P turbine lower the by-pass ratio?

I can understand the need for a bigger dia LP turbine to support a bigger by-pass ratio (need more horsepower and torque to drive a bigger fan) and I can understand a bigger core with the same size fan lowering the bypass ratio.

Please explain what's really going on with the comment above

[gas path]

You've got it in your last statement, the larger diameter of the lp turbine on the d4 reduced the (effective) area of the cold stream duct.
Thats as I remember it anyway. I do remember it being a bit of squeeze to get in the duct compared to the 22b and 524b.
Anyway, whatever, still a damn fine engine!
Come to think of it I used to have the exact reason for the difference written in my old notes. One of those totally useless bits of info that one collects However having stored them for years as loft insulation they got binned in a big clearout.
Maybe I could have sold'em

[Justforkix]

Well, GE90 has the following answers:

gas path: GE90 at 8.4:1
twistedenginestarter: GE90-90B 9.0:1
Zeke: GE 90-85B (e.g. B777) by pass ratio 8.4
Which one is it?

Which of the three biggest engines, GE90, PW4000 and RR800 has the lowest fuel comsumption and how much do they weigh?

What commercial airplane engine has the higest thrust?

edited for spelling errors, some probably still there :o

[Zeke]

Justforkix,

The GE-90 lives in a number of variants, gas path and myself were more than likely taking about the same variant the GE90-85B.

The GE-90 variants, the split between operators and the number of aircraft is

GE90-85B
BRITISH AIRWAYS 15
CHINA SOUTHERN AIRLINES 4

GE90-90B
AEROFLOT 2
BRITISH AIRWAYS 9
LAUDA AIR 3
SAUDI ARABIAN AIRLINES 23
VARIG BRASIL 2

GE90-92B
AIR FRANCE 11
CHINA SOUTHERN AIRLINES 5
CONTINENTAL AIRLINES 18
KUWAIT AIRWAYS 2
MID EAST JET 1

GE90-94B
AIR FRANCE 14
ALITALIA 5
JAPAN AIRLINES 3
SAUDI OGER 1

GE90-115B
JAPAN AIRLINES 2



Below is a list of engines sorted with greatest thrust down, with engine mass and SFC in cruise.

Z



RR-TRENT-892 Thrust=91300 lb Mass=13133 lb Cruise SFC 0.557 (lb/hr/lb)
GEN ELEC-GE 90-85B Thrust=90000 lb Mass=16644 lb Cruise SFC 0.545 (lb/hr/lb)
P & W--PW4084 Thrust=84000 lb Mass=13700 lb Cruise SFC (lb/hr/lb)
RR-TRENT-772 Thrust=71100 lb Mass=10550 lb Cruise SFC 0.565 (lb/hr/lb)
P & W--PW4168 Thrust=68000 lb Mass=14350 lb Cruise SFC (lb/hr/lb)
GEN ELEC-CF6-80E1A2 Thrust=67500 lb Mass=10726 lb Cruise SFC 0.562 (lb/hr/lb)
GEN ELEC-CF6-80C2-A5 Thrust=61300 lb Mass=9135 lb Cruise SFC 0.578 (lb/hr/lb)
RR-RB-211--524H Thrust=60600 lb Mass=9670 lb Cruise SFC 0.57 (lb/hr/lb)
GEN ELEC-CF6-80A2 Thrust=60000 lb Mass=8496 lb Cruise SFC 0.623 (lb/hr/lb)
GEN ELEC-CF6-80C2-B1F Thrust=58000 lb Mass=9499 lb Cruise SFC 0.564 (lb/hr/lb)
P & W--PW4056 Thrust=56750 lb Mass=9400 lb Cruise SFC (lb/hr/lb)
GEN ELEC-CF6-80C2-B2 Thrust=52500 lb Mass=9399 lb Cruise SFC 0.576 (lb/hr/lb)
P & W--PW4052 Thrust=52200 lb Mass=9400 lb Cruise SFC (lb/hr/lb)
P & W--PW4152 Thrust=52000 lb Mass=9400 lb Cruise SFC (lb/hr/lb)
ZMKB --D-18T Thrust=51660 lb Mass=9039 lb Cruise SFC 0.57 (lb/hr/lb)
RR-RB-211--535E4/E4-B Thrust=43100 lb Mass=7264 lb Cruise SFC 0.598 (lb/hr/lb)
P & W--PW2037 Thrust=38250 lb Mass=7160 lb Cruise SFC 0.582 (lb/hr/lb)
JASC AVIA--PS-90A Thrust=35275 lb Mass=6503 lb Cruise SFC 0.595 (lb/hr/lb)
IAE-V2533-A5 Thrust=33000 lb Mass=5230 lb Cruise SFC 0.574 (lb/hr/lb)
CFMI-CFM 56-5C2 Thrust=31200 lb Mass=5700 lb Cruise SFC 0.545 (lb/hr/lb)
IAE-V2500-A1 Thrust=25000 lb Mass=5210 lb Cruise SFC 0.581 (lb/hr/lb)
IAE-V2525-D5 Thrust=25000 lb Mass=5252 lb Cruise SFC 0.574 (lb/hr/lb)
CFMI-CFM 56-5A1 Thrust=25000 lb Mass=4860 lb Cruise SFC 0.596 (lb/hr/lb)
JASC AVIA--D-30KU II Thrust=23850 lb Mass=5110 lb Cruise SFC 0.7 (lb/hr/lb)
CFMI-CFM 56-3C1 Thrust=23500 lb Mass=4301 lb Cruise SFC 0.667 (lb/hr/lb)
IAE-V2522-A5 Thrust=22000 lb Mass=5252 lb Cruise SFC 0.574 (lb/hr/lb)
P & W--JT8D-219 Thrust=21700 lb Mass=4515 lb Cruise SFC 0.737 (lb/hr/lb)
CFMI-CFM 56-7B20 Thrust=20600 lb Mass=5234 lb Cruise SFC (lb/hr/lb)
BMW:RR--BB715-55 Thrust=19883 lb Mass=4545 lb Cruise SFC 0.62 (lb/hr/lb)
ZMKB--D-436T1 Thrust=16865 lb Mass=3197 lb Cruise SFC 0.61 (lb/hr/lb)
RR-TAY-651 Thrust=15400 lb Mass=3380 lb Cruise SFC 0.69 (lb/hr/lb)
BMW:RR--BR710 Thrust=14845 lb Mass=3520 lb Cruise SFC 0.64 (lb/hr/lb)
RR-TAY-611 Thrust=13850 lb Mass=2951 lb Cruise SFC 0.69 (lb/hr/lb)
RR-SPEY- 511-8 Thrust=11400 lb Mass=2483 lb Cruise SFC 0.8 (lb/hr/lb)
RR-RB 183-555-15P Thrust=9900 lb Mass=2287 lb Cruise SFC 0.8 (lb/hr/lb)
GEN ELEC-CF34-3A,3B Thrust=9220 lb Mass=1670 lb Cruise SFC (lb/hr/lb)
ALLISON--AE3007 Thrust=7150 lb Mass=1581 lb Cruise SFC (lb/hr/lb)
ALLIEDSIG--LF507 Thrust=7000 lb Mass=1385 lb Cruise SFC 0.414 (lb/hr/lb)
ALLIEDSIG--ALF502R-5 Thrust=6970 lb Mass=1336 lb Cruise SFC 0.72 (lb/hr/lb)
CFE--CFE738 Thrust=5918 lb Mass=1325 lb Cruise SFC 0.645 (lb/hr/lb)
P&W Canada--PW305B Thrust=5266 lb Mass=993 lb Cruise SFC 0.675 (lb/hr/lb)
P&W Canada--JT15D Thrust=3045 lb Mass=632 lb Cruise SFC 0.541 (lb/hr/lb)
WILL: RR--FJ44 Thrust=1900 lb Mass=445 lb Cruise SFC 0.75 (lb/hr/lb)

[Justforkix]

Zeke, I guess that is just of the top of your mind? Or do you have a large database?