Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

777W ride in turbulence

Tech Log The very best in practical technical discussion on the web

777W ride in turbulence

Old 7th Oct 2016, 16:04
  #1 (permalink)  
Thread Starter
 
Join Date: Mar 2003
Location: Here
Posts: 946
777W ride in turbulence

Hi folks, just recently paxed (in the aft) of various 777W flights with different carriers/aircraft ages, and surprised how you seem to feel every single bump, no matter how light or moderate, the whole thing just jolts. I read about the turbulence suppression system, but it doesn't seem to be doing that good of a job. The A320 family that I fly also can feel harsh but it seems to do a better job in comparison....

Any 777 drivers have any idea whats going on??
BAe 146-100 is online now  
Old 7th Oct 2016, 16:33
  #2 (permalink)  
 
Join Date: Jan 2008
Location: Reading, UK
Posts: 12,316
Don't mean to state the obvious, but the back end of a 777 is farther from the CofG than the back end of an A320.
DaveReidUK is online now  
Old 7th Oct 2016, 16:52
  #3 (permalink)  
Thread Starter
 
Join Date: Mar 2003
Location: Here
Posts: 946
True, but doesn't explain why the thing just unquestionably rocks from side to side at the slightest bump compared with other (Airbus + Boeing) long haul aircraft of the same size.
BAe 146-100 is online now  
Old 7th Oct 2016, 17:13
  #4 (permalink)  
 
Join Date: Dec 2014
Location: The wrong timezone
Posts: 227
I always thought it was a bit poor in turbulence too - not enough speed stability.
anson harris is offline  
Old 7th Oct 2016, 22:37
  #5 (permalink)  
 
Join Date: Jun 2013
Location: Róisín Dubh
Posts: 1,227
Well it's moving a hell of a lot faster than the A320 for one thing....
Una Due Tfc is offline  
Old 7th Oct 2016, 22:53
  #6 (permalink)  
 
Join Date: Jan 2008
Location: Reading, UK
Posts: 12,316
Originally Posted by Una Due Tfc View Post
Well it's moving a hell of a lot faster than the A320 for one thing....
About 8% faster in cruise, in fact.
DaveReidUK is online now  
Old 7th Oct 2016, 22:56
  #7 (permalink)  
 
Join Date: Jun 2013
Location: Róisín Dubh
Posts: 1,227
M085 vs M078 makes a big difference in turbulence....at least I assume it does with all the whining you hear coming off the NAT
Una Due Tfc is offline  
Old 7th Oct 2016, 23:29
  #8 (permalink)  
 
Join Date: Aug 2013
Location: PA
Age: 55
Posts: 34
the lateral oscillation due to the gust suppression system has been talked about quite a bit.
underfire is offline  
Old 8th Oct 2016, 08:27
  #9 (permalink)  
 
Join Date: Sep 2005
Location: home @ 103E
Age: 56
Posts: 78
I sit at the pointy end, flying both the 63m & 73m long variants. I tend to spill more coffee on the longer ones. 😯
perantau is offline  
Old 8th Oct 2016, 08:38
  #10 (permalink)  
 
Join Date: Dec 2003
Location: Tring, UK
Posts: 1,501
Easy. Pay a bit more and travel nearer the middle.

I have noticed on the -300 that quite low amplitude lateral disturbances, nowhere near worth putting the seatbelt signs on for, are just the right frequency to “pump” oscillations in cups and glasses to the point that the liquid makes a determined bid for freedom. Quite annoying in the middle of the night when you’re not aware of it building up until you get drenched with cold tea...
FullWings is offline  
Old 8th Oct 2016, 09:16
  #11 (permalink)  
 
Join Date: Jun 2011
Location: france
Posts: 759
resonance

Good example of resonance in cups and glasses with the plane oscillation (Where is smiley "wet by cold tea"?)
roulishollandais is offline  
Old 8th Oct 2016, 15:00
  #12 (permalink)  
 
Join Date: Apr 2006
Location: Krug departure, Merlot transition
Posts: 563
All I know is a few years after getting on the 747 I suddenly realised I never seemed to hit any turbulence any more...
main_dog is online now  
Old 9th Oct 2016, 07:08
  #13 (permalink)  
 
Join Date: Aug 2009
Location: Seat 0A
Posts: 518
It's true, the modal gust suppression leaves something to be desired in the -300 combined with what I guess is a slightly too large vertical stabiliser for the fuselage length, all turbulence seems to be translated into tail waggle
STBYRUD is offline  
Old 9th Oct 2016, 08:23
  #14 (permalink)  
 
Join Date: Apr 2004
Location: Planet Earth
Posts: 1,905
Too large ?


It always looked way too small to me, that's the problem.
stilton is offline  
Old 9th Oct 2016, 18:59
  #15 (permalink)  
 
Join Date: Jan 2006
Location: US
Posts: 2,205
777 has a much better wing in turbulence than the 320.
misd-agin is offline  
Old 10th Oct 2016, 06:57
  #16 (permalink)  
 
Join Date: Feb 2014
Location: Australia
Posts: 23
Sat in the rear a couple times across the Pacific in the 777. Seems to be a nice, rubber like bouncing motion in turbulence. Found it relaxing and put me to sleep. Personally they should 'make it bounce' like that when it's smooth.


More concerned with flying so long over water with 'only' 2 engines. Bring back the 747 I say. Who cares if it costs a little more to fill up at the service station?
Jonno_aus is offline  
Old 10th Oct 2016, 08:31
  #17 (permalink)  
 
Join Date: Jan 2008
Location: Reading, UK
Posts: 12,316
Originally Posted by Jonno_aus View Post
Who cares if it costs a little more to fill up at the service station?
You mean, apart from the manufacturers, airlines and 99% of fare-paying passengers?
DaveReidUK is online now  
Old 10th Oct 2016, 15:49
  #18 (permalink)  
 
Join Date: Feb 2014
Location: Australia
Posts: 23
99% of passengers care if it costs a little more to run? Ok.
Jonno_aus is offline  
Old 10th Oct 2016, 17:03
  #19 (permalink)  
 
Join Date: Jul 2013
Location: Everett, WA
Age: 65
Posts: 2,994
Originally Posted by Jonno_aus View Post
99% of passengers care if it costs a little more to run? Ok.
They care when it gets reflected in the cost of their ticket
tdracer is offline  
Old 10th Oct 2016, 17:39
  #20 (permalink)  
 
Join Date: Feb 2014
Location: Australia
Posts: 23
Cut back the airline's CEOs and other managers salary and bonus? Easy!
Jonno_aus is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.