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User avatar
seabosdca
Posts: 6397
Joined: Sat Sep 01, 2007 8:33 am

Re: Boeing 777X Production Thread 2018

Tue Dec 18, 2018 6:22 pm

WIederling wrote:
GE9X is running in idle ( cue the unchanging whirligig pattern on the test specimen.)
while the original engines spool up.


That's not what GE says, and they're right: look more carefully at the fan blades of the GE9X. You can see them speeding up through the strobe effect caused by the camera's frame rate.

From GE's caption to that picture: "This is the #GE9X going to takeoff power on the run pad last week in preparation for its second flight test campaign."

That is also certainly not what three CF6s sound like.
 
a7ala
Posts: 274
Joined: Sun Jan 04, 2015 10:27 pm

Re: Boeing 777X Production Thread 2018

Wed Dec 19, 2018 1:28 am

Does anyone have an idea as to what the take-off/landing performance will be like relative to the 200LR or 300ER for the 777-8/9? Im guessing we wont see anything from Boeing until the first aircraft is delivered.
 
WIederling
Posts: 8357
Joined: Sun Sep 13, 2015 2:15 pm

Re: Boeing 777X Production Thread 2018

Wed Dec 19, 2018 9:09 am

a7ala wrote:
Does anyone have an idea as to what the take-off/landing performance will be like relative to the 200LR or 300ER for the 777-8/9? Im guessing we wont see anything from Boeing until the first aircraft is delivered.

Same MTOW much more wing.
Take off and landing speeds should be lower.
Even with 10% less thrust runway use should be lower.
Less issues with performance limiting tire speed.
( 77W does profit a lot less ( or not at all ) from longer runways
that allows the Airbus type range to do the Albatross Airlines thing.)
Murphy is an optimist
 
a7ala
Posts: 274
Joined: Sun Jan 04, 2015 10:27 pm

Re: Boeing 777X Production Thread 2018

Wed Dec 19, 2018 9:07 pm

WIederling wrote:
a7ala wrote:
Does anyone have an idea as to what the take-off/landing performance will be like relative to the 200LR or 300ER for the 777-8/9? Im guessing we wont see anything from Boeing until the first aircraft is delivered.

Same MTOW much more wing.
Take off and landing speeds should be lower.
Even with 10% less thrust runway use should be lower.
Less issues with performance limiting tire speed.
( 77W does profit a lot less ( or not at all ) from longer runways
that allows the Airbus type range to do the Albatross Airlines thing.)


Looking at the 200LR from the boeing charts std day, sea level MCTOW takeoff is around 10,100 feet for the 110B1L engine and around 9,200 feet for the 115B1L.
And for 300ER its also around 10,000 feet. Would you hazard a guess as to where the B777-8/9 would end up for MCTOW takeoff?
 
WIederling
Posts: 8357
Joined: Sun Sep 13, 2015 2:15 pm

Re: Boeing 777X Production Thread 2018

Wed Dec 19, 2018 9:34 pm

a7ala wrote:
... And for 300ER its also around 10,000 feet.
Would you hazard a guess as to where the B777-8/9 would end up for MCTOW takeoff?


nearer the A359 (2600m) than the 77W ( 3050m) would be my unworthy guess.
( will the trailing edge have a thrust gate as on the original 777?
see: https://aviation.stackexchange.com/ques ... ps-compare
Murphy is an optimist
 
OldAeroGuy
Posts: 3836
Joined: Sun Dec 05, 2004 6:50 am

Re: Boeing 777X Production Thread 2018

Wed Dec 19, 2018 10:43 pm

WIederling wrote:
a7ala wrote:
... And for 300ER its also around 10,000 feet.
Would you hazard a guess as to where the B777-8/9 would end up for MCTOW takeoff?


nearer the A359 (2600m) than the 77W ( 3050m) would be my unworthy guess.
( will the trailing edge have a thrust gate as on the original 777?
see: https://aviation.stackexchange.com/ques ... ps-compare


The 777X will have an inboard all-speed flaperon similar to the 777 Classic, 777NG, and 787.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
a7ala
Posts: 274
Joined: Sun Jan 04, 2015 10:27 pm

Re: Boeing 777X Production Thread 2018

Thu Dec 20, 2018 12:51 am

WIederling wrote:
a7ala wrote:
... And for 300ER its also around 10,000 feet.
Would you hazard a guess as to where the B777-8/9 would end up for MCTOW takeoff?


nearer the A359 (2600m) than the 77W ( 3050m) would be my unworthy guess.
( will the trailing edge have a thrust gate as on the original 777?
see: https://aviation.stackexchange.com/ques ... ps-compare


That will be impressive given the 352T MCTOW of the B777-8/9 vs the A359 at 280T.
 
WIederling
Posts: 8357
Joined: Sun Sep 13, 2015 2:15 pm

Re: Boeing 777X Production Thread 2018

Thu Dec 20, 2018 7:33 am

a7ala wrote:
That will be impressive given the 352T MCTOW of the B777-8/9 vs the A359 at 280T.

Not really. both have very similar Thrust to Weight ratios.
But due to the 777X not getting an uninterrupted flap line my guess goes up slightly towards the 77W.
Murphy is an optimist
 
OldAeroGuy
Posts: 3836
Joined: Sun Dec 05, 2004 6:50 am

Re: Boeing 777X Production Thread 2018

Thu Dec 20, 2018 5:47 pm

WIederling wrote:
a7ala wrote:
That will be impressive given the 352T MCTOW of the B777-8/9 vs the A359 at 280T.

Not really. both have very similar Thrust to Weight ratios.
But due to the 777X not getting an uninterrupted flap line my guess goes up slightly towards the 77W.


A well designed flaperon doesn't create a significant flap span discontinuity, particularly at takeoff positions..

https://imgproc.airliners.net/photos/ai ... .jpg?v=v40

The 777X flap system will be similar to the 787.

https://www.ainonline.com/sites/default ... 1498027459

A350 picture included for comparison purposes.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
User avatar
atcsundevil
Moderator
Posts: 3443
Joined: Sat Mar 20, 2010 12:22 pm

Re: Boeing 777X Production Thread 2018

Tue Jan 01, 2019 1:12 am

Please continue in next year's thread.

viewtopic.php?f=3&t=1411905
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