JAM747
Topic Author
Posts: 524
Joined: Thu Feb 03, 2005 12:17 am

737NG With 757 Engines And Wing?

Sat Aug 05, 2006 11:02 pm

Is it feasible or possible for a version of the 737 to have the 757 wings and/or engines so it can perform roles which the 737-900ER and A 321 cannnot? If I am not mistaken the 757, and 737 both share a similar fuselage derived from the 707. How different are the wings of the 757 from a 737NG ER? I know the 757 used RR or Pratt engines which might not currently be used on the 737. Since the 757 production was closed because of little or no orders maybe it might be more feasible to have this this hypothetical 737/757 hybrid on the same 737 line for a carrier who might need such a capability till Y1 comes out. The TU 214 is available with RR engines like the 757 now so maybe a version of the 737 could also which could be more marketable than the Tu 214. I am not sure if this has been discussed before. If Boeing was to do this might as well throw in the double wheel boggies.  Smile
 
A342
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RE: 737NG With 757 Engines And Wing?

Sat Aug 05, 2006 11:21 pm

It would essentially be the same aircraft as before, maybe with a shorter fuselage. Makes no sense.
Exceptions confirm the rule.
 
ksupilot
Posts: 635
Joined: Wed Jul 26, 2006 9:27 am

RE: 737NG With 757 Engines And Wing?

Sat Aug 05, 2006 11:39 pm

And what about ground clearance? The reason why the 737 has smaller engines is because they are the only thing that fit under the wing. The 757 sits higher off the ground than the 737...that is the main difference between the two.
 
acidradio
Crew
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RE: 737NG With 757 Engines And Wing?

Sat Aug 05, 2006 11:40 pm

When the 757 was first designed, Boeing tried to shop around a "757-100", which would fit that bill. But, nobody took to it as the economics were not quite up to par. The -200 and -300 though, well, those have done alright.
Ich haben zwei Platzspielen und ein Microphone
 
Glareskin
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RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 12:09 am

Isn't a 757 just a 737 fuselage with higher landing gear because of the bigger engines?
There's still a long way to go before all the alliances deserve a star...
 
AC320tech
Posts: 193
Joined: Mon Jul 31, 2006 6:32 am

RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 12:16 am

Quoting Glareskin (Reply 4):
Isn't a 757 just a 737 fuselage with higher landing gear because of the bigger engines?

No, Its basically like (to an extent) the 737, 707, and 727. But its a totally different aircraft.
 
flydreamliner
Posts: 1928
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RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 12:21 am

Quoting Glareskin (Reply 4):
Isn't a 757 just a 737 fuselage with higher landing gear because of the bigger engines?

The two share the same fuselage cross section (like say, A300 and A330). The nose, tail, wing boxes, verticle and horizontal stabilizers, and airfoils, as well as landing gear, share nothing in common between the two.

The 757 wing is a 15 year older design, and while it has fantastic lifting abilities (like the 276,000 lbs of 753), my suspicions are that the 73G wing may be slightly more efficient. Moreover, raked wingtip extensions, like those on 764 and 772LR/773ER over the 73G wing could provide the additional lift needed with negligible drag penalty. If they really wanted, they could sling the slightly less efficient, but more powerful CFM56-5C (you know it from the A342 and A343) which has demonstrated up to 36,000lbs of thrust, and is rated to a static 34,000lbs. That and raked wingtip extension, and you could pull a heavier plane, with more fuel, into the air leaving the 757, and it's late 70s/early 80s technology aside, and probably get better economics (given the 739's better structural efficiency vs 752).
"Let the world change you, and you can change the world"
 
warreng24
Posts: 573
Joined: Fri Nov 18, 2005 9:38 am

RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 12:26 am

You will need a new landing gear assembly.

The RB211 and PW2000 engines are larger in diameter than the CFM56's.

One of the major issues with the 737 is how low it sits to the ground. The ground height is EXCELLENT in terms of maintenance and loading. The 737 was designed for the low-bypass turbofan engines, such as the JT8D.

When the 737-300 was developed, Boeing couldn't raise the aircraft much, so they had to ask CFM to design the engine to fit. You'll notice that the engine nacelle on the CFM56 on the 737 is flat on the bottom. This prevents the engine from being to low to the ground.

So, if you'd like to get 757 engines on a 737, you'll need a new landing gear to raise the aircraft up so the RB211 and PW2000 engines don't scrape on the ground.  Smile
 
N231YE
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RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 1:08 am

Quoting AC320tech (Reply 5):
No, Its basically like (to an extent) the 737, 707, and 727. But its a totally different aircraft.

Believe it or not, the 757 is supposed to be a "modernized 727," though I agree there is very little commonality between the two, other than the 3x3 seating.
 
DfwRevolution
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RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 1:26 am

Quoting FlyDreamliner (Reply 6):
The two share the same fuselage cross section (like say, A300 and A330).

They share the same upper fuselage diameter, but the lower fuselage is slightly wider and comes closer to a circular pattern.

Quoting N231YE (Reply 8):
Believe it or not, the 757 is supposed to be a "modernized 727,"

That's the role Boeing intended when they launched the aircraft, but it quickly grew into something far larger and heavier than the 727.

Once commonality with the 727 was no longer necessary, the program went into parallel with the 767 project.
 
dutchjet
Posts: 7714
Joined: Sat Oct 14, 2000 6:13 am

RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 3:19 am

Its funny........so many think that if the 757 was back in production, or if a successor was developed (such as a hybrid suggested by this post) that the airlines would be rushing to order the type. The fact is that Boeing did everything it could to sell additional 757s and there was simply no interest from the airlines. US carriers are now using their existing 757 fleets differently...such as on tran-atlantic journeys, but they are simply redelopying assets. Many US domestic routes that were once flown by the 757 are now handled by 738s and A320s, freeing the 757s up for the transatlantic flights...being that some of the US legacy carriers have decided that international is more interesting than domestic flying, the 752s are ending up on the transatlantic services.....but its very unlikely that the airlines would be ordering additional 757s at this point in time if the type were still available.

The 757 is one of my favorites.....its a great and hugely versatile airplane, but it is time to move along.

Most expect that the largest and most powerful variants of the 737NG successor and A32X successor will match or exceed the capbilities of the 752....and will be much more effecient and offer low per seat operating costs. Until those airplanes are offered, the 739ER and the A321-200 will can cover most, if not all, missions flown by the 757.
 
Glareskin
Posts: 1004
Joined: Fri Jun 03, 2005 9:35 pm

RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 4:35 pm

Quoting Dutchjet (Reply 10):
757 are now handled by 738s and A320s

And don't forget the A321 comes close.

Quoting Dutchjet (Reply 10):
The 757 is one of my favorites

Mine as well. Sooo powerful!
There's still a long way to go before all the alliances deserve a star...
 
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HAWK21M
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RE: 737NG With 757 Engines And Wing?

Sun Aug 06, 2006 5:27 pm

Wouldn't that be a Smaller B737-900ER.  Smile
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MEL
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