aircanada014
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If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 4:38 am

Hello all


I don't think this post ever been discussed. If Boeing decides to do the 787-10 would that mean Boeing will have to ask GE to make a new powerful engine of greater than 75000lb thrust? We all know Airbus wants to make a new A370 and needs a powerful engine than the one GEnx is offering from 55,000lbs to 75,000lbs of thrust. Airbus wants at least 95,000lb thrust from GE so customers have two choices of engine makers. GE doesn't want to make new powerful engine for A370 because of Boeing 777-200ER and 777-300 being the sole supplier of GE.
 
DAYflyer
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 4:44 am

The 787-10 may require slightly more thrust, but not a new engine entirely. If they take the size any bigger than that currently speculated, they may be forced to look at another larger GENx engine.

I have always wondered if it were possible to de-rate the GE-90 to the thrust class needed for a bigger -10 without a huge fuel or efficiency penalty.

[Edited 2006-07-12 21:47:51]
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1337Delta764
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 4:45 am

Boeing and GE have lately had a close relationship, and IMO GE is more likely to make an engine for the 787-10 than the A370.
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NYC777
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 4:49 am

I don't think it would make sense to put a de-rated GE90 on the 787-10 mainly beccause the 787 is designed to be bleedless and the GE90 a bleeded engine. They would have to substantially rework the design.

It would make more sense to go with a larger GENX (do to the 787 what the GE90-115 did for the 777LR).
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trex8
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 10:29 am

at this time Boeing are saying the 787-10 will not have a higher TO weight than a -9 so whatever works for the -9 will be fine, which will likely be something in the thrust size of whatever the "original" A350-9 needs.
 
sunrisevalley
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 11:20 am

Widebodyphotog in his table http://theaviationspecialist.com/787_family.gif
shows a Trent 1075-77 with a thrust of 75300lb. He shows a GEnX-75B1 on the 787-9 at about the same thrust.
 
PolymerPlane
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Thu Jul 13, 2006 12:50 pm

I would think that boeing would wait a liitle bit until the GEnX and trent 1000 are mature enough, and both or one of the companies is willing to develop a more efficient more powerful engine, and launch 787-10ER.

I think both GE and RR will be very cautious to launch too many variants at one time, before actually recouping the development costs.

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Geo772
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Fri Jul 14, 2006 1:30 am

There is no way that the GE90 would ever be used for the 787. Firstly it is just too big and heavy to make any sense. Incidentally it is already available at a 75,000lb thrust rating on the A market 772. However it is not until you get over 100,000lb that it starts to become a great engine.

The GEnx is likely to have a lot of GE90 derived technology within it, but in a package better suited to the 787.
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DAYflyer
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Fri Jul 14, 2006 2:12 am

Quoting NYC777 (Reply 3):
I don't think it would make sense to put a de-rated GE90 on the 787-10 mainly beccause the 787 is designed to be bleedless and the GE90 a bleeded engine. They would have to substantially rework the design.

Good point...forgot about the bleedless issue, just thinking about the thrust.

Quoting Geo772 (Reply 7):
Firstly it is just too big and heavy to make any sense. Incidentally it is already available at a 75,000lb thrust rating on the A market 772

Thanls to you both for these concise answers. I appreciate it very much.
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pavlin
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RE: If Boeing Decide To Do 787-10 Does That Mean?

Fri Jul 14, 2006 2:25 am

Quoting NYC777 (Reply 3):
It would make more sense to go with a larger GENX

Isn't the GENX designed to be even more powerful in the future