747400sp
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Joined: Sat Aug 09, 2003 7:27 pm

PW 4000 On The T-7s?

Mon Mar 15, 2010 2:19 am

Seeing how powerful the PW 4080, PW 4084,PW 4090 and PW 4098 are, it make me think. How simular or the PW 4000s on Boeing 777s, are to the ones on 744s, MD11s, A330s and 767s?
 
jayeshrulz
Posts: 349
Joined: Sun Apr 29, 2007 7:36 pm

RE: PW 4000 On The T-7s?

Mon Mar 15, 2010 6:00 am

http://en.wikipedia.org/wiki/Boeing_777#Specifications

This will answer your question.

PW has the least thrust(that does not mean it is not powerful) in 772ER. in 77A, all have the same thrust.
Only for 773, PW offers 98000 x2 (WOW).
Keep flying, because the sky is no limit!
 
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Starlionblue
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RE: PW 4000 On The T-7s?

Mon Mar 15, 2010 10:17 am

Here's another relevant page http://en.wikipedia.org/wiki/Pratt_&_Whitney_PW4000. Note how the three versions have very different fan diameters. The page doesn't say if the cores are more or less identical.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
MarkC
Posts: 238
Joined: Tue Apr 25, 2006 8:10 am

RE: PW 4000 On The T-7s?

Mon Mar 15, 2010 10:56 am

OK, I have worked on more than my share of these things.

The 747 / MD11 / A300 / A310 / 767 PW4000's are the 94" fan version. The 777 is the 112" version.

There are three versions of the 112. The first is the original 74 / 77k thrust version. The second is the 90k version, which is similar, but slightly different. This is sometimes derated by operators to become an 84k, or even 77k version. These are then labeled 4084D and 4077D. The 98k version was much different from the others, but there were only 9 engines sold to 1 operator (Korean), and these were all taken back.

The core is remarkably roughly the same size in all fan diameter 4000 versions, with the same number of stages in both HPC (11) and HPT (2). It would fit into the same clearance envelope. The LPT in the 112 is 7 stages (huge) vs 4 in the 94's. LPC is 7 stages in the 112, and 5 in the 94's, although the 98k version had 8 stages. Suffice it to say the 98k's had an unbelievable airfoil count.

Gearbox is the same size, and is more based on the airframe manufacturer than the engine. (eg. MD11 has an extra pump).

This is some general background. Any specific questions?

Mark

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