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T-O Performance On 777-200ER GE90-95 Vs PW4090  
User currently offlineWidebodyphotog From United States of America, joined Jun 1999, 917 posts, RR: 67
Posted (14 years 1 month 3 weeks 5 days 14 hours ago) and read 4453 times:

I would like to know if some of you knowledgeble folks out there could give me some answers to a few questions I've got.

I would like to know the take-off performance differences between two versions of 777-200ER at MTOW for a 5950nm mission. (Basically the runway requirements) The comparison is between a GE90 Powered 777-200ER at 656,000lb TOW vs PW4090 Powered 777-200ER at 632,500lb TOW. The assumptions are that both are carrying a full pax load of 234 persons and cargo is at maximum limited by fuel required for the mission. Also assuming same wind conditions for both aircraft.

Another question I would like to pose is does Boeing offer PW powered 777-200ER at 656,000lb MTOW, and if they do what is the engine thrust for that version. The information I have received says that 656,000lb MTOW is offered for R-R and GE powered 772ER but not PW.

If there is any other important parameter I left out of my inquiry I am sure someone will fill me in and I will rectify it if I can.


If you know what's really going on then you'll know what to do
11 replies: All unread, jump to last
 
User currently offlineAFa340-300E From France, joined May 1999, 2084 posts, RR: 26
Reply 1, posted (14 years 1 month 3 weeks 5 days 9 hours ago) and read 4291 times:

Hello,

Could you please precise what type of GE90?

Regards,
Alain


User currently offlineWidebodyphotog From United States of America, joined Jun 1999, 917 posts, RR: 67
Reply 2, posted (14 years 1 month 3 weeks 5 days 8 hours ago) and read 4279 times:

GE90-92B...


If you know what's really going on then you'll know what to do
User currently offlineTwa747100 From United States of America, joined May 1999, 600 posts, RR: 0
Reply 3, posted (14 years 1 month 3 weeks 23 hours ago) and read 4247 times:

Now that is what i call a question

User currently offlineYaki1 From , joined Dec 1969, posts, RR:
Reply 4, posted (14 years 1 month 3 weeks 22 hours ago) and read 4229 times:

The highest MTOW for a 777-200 IGW with Pratts I've seen is 640,000 using PW4090-3

User currently offlineYaki1 From , joined Dec 1969, posts, RR:
Reply 5, posted (14 years 1 month 3 weeks 7 hours ago) and read 4208 times:

Disregard my post above - its 650,000 Max Taxi weight, 648,000 Max Takeoff, with PW4090B. The detail spec. only states more than 90,000 lbs.

User currently offlineWidebodyphotog From United States of America, joined Jun 1999, 917 posts, RR: 67
Reply 6, posted (14 years 1 month 2 weeks 6 days 2 hours ago) and read 4191 times:

Thanks for that bit of information! The PW4090B only makes 90,000lbt? And the MTOW allowed with that thrust setting is 648,000lb? Those numbers would make the field length significantly longer than GE90-92/3/5 with 93,000lbt and 656,000lbs I would think, especially considering the GE90's greater propulsive efficiency. I have been able to obtatain a weight and balance and fuel plan simulation for a GE powered 772ER going from CDG to SIN and back but I can't find any such info for a PW powered version. Does anyone operate the PW 772ER on a route of similar length? (ie 6,800sm by the great circle distance)

Tks

widebodyphotog



If you know what's really going on then you'll know what to do
User currently offlineConcordeBoy From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 1 month 2 weeks 6 days 7 hours ago) and read 4103 times:

Quoting Widebodyphotog (Thread starter):
Another question I would like to pose is does Boeing offer PW powered 777-200ER at 656,000lb MTOW,

Nope, limit is 648K.lb

PW operators didn't seem to mind, because of Pratt's gold-n'-glory promises of the PW4098's future performance. Once that engine not-so-surprisingly turned out to be a complete and utter flop, GE/RR pulled significantly ahead on the higher MTOW 777 sales.

Quoting Widebodyphotog (Reply 6):
The PW4090B only makes 90,000lbt?

Oddly enough, yes. It's certified for 91,790K.lb but no operator ops it over 90K

I recently posted a similar thread to this before reading this one:
http://www.airliners.net/discussions...eneral_aviation/read.main/2130260/


User currently offlineKALB From United States of America, joined Mar 2000, 573 posts, RR: 0
Reply 8, posted (9 years 1 month 2 weeks 5 days 12 hours ago) and read 3988 times:

Most of the time the maximum performance differences between the various engines available to power the 777, probably does not matter. I imagine most operators probably use FMC generated reduced power settings for takeoffs.

User currently offlineWidebodyphotog From United States of America, joined Jun 1999, 917 posts, RR: 67
Reply 9, posted (9 years 1 month 2 weeks 5 days 3 hours ago) and read 3931 times:

Good God!

I started this thread five years ago and since then I've been privleged enough to get to a position where I can work out the answers to questions like these and apply those answers to real situations on a daily basis.

Thanks all for the responses

-widebodyphotog



If you know what's really going on then you'll know what to do
User currently offlineGigneil From United States of America, joined Nov 2002, 16347 posts, RR: 85
Reply 10, posted (9 years 1 month 2 weeks 5 days 2 hours ago) and read 3921 times:

How the hell did this happen, exactly?

N


User currently offlineConcordeBoy From , joined Dec 1969, posts, RR:
Reply 11, posted (9 years 1 month 2 weeks 5 days ago) and read 3944 times:

Holy crap!

...I never once noticed the date.  shock  Just did a typical search in the tech forum trying to answer my PW4090 question and this came up.


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