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Quad-Engine Configuration  
User currently offlineBoston92 From United States of America, joined Aug 2006, 3390 posts, RR: 7
Posted (8 years 1 week 1 day 19 hours ago) and read 1972 times:

Is there an a/c out there that has four engines; 2 rear and 2 under-wing. So kind of like a MD80 with two additional engines under the wing. With this configuration, you could have a large wide-body and have a more distributed weight than with a 747.

How long until an a/c manufacturer make an a/c with this configuration?

Any comments are welcome.


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3 replies: All unread, jump to last
 
User currently offlineEBJ1248650 From United States of America, joined Jun 2005, 1932 posts, RR: 1
Reply 1, posted (8 years 1 week 1 day 19 hours ago) and read 1949 times:

Quoting Boston92 (Thread starter):
Is there an a/c out there that has four engines; 2 rear and 2 under-wing. So kind of like a MD80 with two additional engines under the wing. With this configuration, you could have a large wide-body and have a more distributed weight than with a 747.

How long until an a/c manufacturer make an a/c with this configuration?

Any comments are welcome.

There's nothing out there ... yet ... like you described. The VC-10 and Super VC-10 have four engines in the rear, as does the IL-62. The L1011, DC-10, and MD-11 have one engine in the rear and one engine under each wing. I don't really think you're going to see an airliner designed with the configuration you're talking about. As large as engines are getting, it's likely all four engine layouts will mount 2 engines under each wing.



Dare to dream; dream big!
User currently onlineOldAeroGuy From United States of America, joined Dec 2004, 3596 posts, RR: 66
Reply 2, posted (8 years 1 week 1 day 17 hours ago) and read 1855 times:

Quoting Boston92 (Thread starter):
With this configuration, you could have a large wide-body and have a more distributed weight than with a 747.

But you don't want to distribute the weight in this manner.

Keeping the all the engines on the wings will:

Make it easier to balance the airplane by keeping the zero fuel weight CG near the wing Aerodynamic Center (AC).

Provide bending moment relief for the wing, resulting in a lighter wing structure.

You do need to carefully design the outboard engine nacelle/strut and outboard wing to avoid excessive cruise drag though.



Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
User currently offlineChrisi1024 From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 1 week 1 day 16 hours ago) and read 1792 times:

Not a civil (or even a production) aircraft, but the Junkers Ju 287 had two forward-mounted engines on the fuselage and one under each forward-swept wing. It was a funny looking thing.

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