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777X set for January 23rd first flight

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777X set for January 23rd first flight

Old 26th Jan 2020, 20:38
  #81 (permalink)  
 
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Originally Posted by Auxtank View Post
With the gear down - it would be...
Under 270 KIAS actually...(and probably well under that..)
Thanks, I know that limit is for gear extension but was curious as to what the max operating speed would be with the gear staying down. Mind you flight tracker is not always completely accurate. Thanks
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Old 26th Jan 2020, 20:44
  #82 (permalink)  
 
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I wondered how much they increase Vr for safety? It's noticeable that the front wheel of the MLG rises prior to rotation (I imagine for two reasons - The wing was ready and also the semi levered landing gear is ready to give it a shove off the ground) it just left me wondering what the margin is?
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Old 26th Jan 2020, 22:05
  #83 (permalink)  
 
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Originally Posted by Longtimer View Post
Thanks, I know that limit is for gear extension but was curious as to what the max operating speed would be with the gear staying down. Mind you flight tracker is not always completely accurate.
Even if it's accurate, it won't give you KIAS or KTAS, only groundspeed.
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Old 26th Jan 2020, 23:26
  #84 (permalink)  
 
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Originally Posted by Cough View Post
I wondered how much they increase Vr for safety? It's noticeable that the front wheel of the MLG rises prior to rotation (I imagine for two reasons - The wing was ready and also the semi levered landing gear is ready to give it a shove off the ground) it just left me wondering what the margin is?
I had read somewhere that there concerns with the added length causing tail strikes and then in another article is was pointed out that the new wing had better lift so perhaps that is why the main gear lifted first.
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Old 27th Jan 2020, 17:22
  #85 (permalink)  
 
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"You can bet if an engine failure occurred on takeoff they would have raised the gear."

In military test pilot schools, it is taught that you keep the gear down while going through all the other tests that must be done on first flights. As for what to do if you lose an engine on a first flight, they were probably pretty light so they might not pull it up even then. Just my thinking. In any case gear movement is a massive thing. The KISS principle applies. Keep It Simple, Stupid.
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Old 28th Jan 2020, 06:27
  #86 (permalink)  
 
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Boeing sees the new 777X as a ray of hope, but it emerged from the same culture of cutting corners and coverups that gave us the MAX crisis.
https://www.ccn.com/i-would-never-fly-boeings-new-777x/
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Old 28th Jan 2020, 08:35
  #87 (permalink)  
 
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Originally Posted by Longtimer View Post
Thanks, I know that limit is for gear extension but was curious as to what the max operating speed would be with the gear staying down. Mind you flight tracker is not always completely accurate. Thanks

Boeing no longer has separate limiting speeds for gear retraction/ extension/ extended as they did in the past


They have standardized on 270/.82 for all three

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Old 28th Jan 2020, 08:59
  #88 (permalink)  
 
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Originally Posted by stilton View Post
Boeing no longer has separate limiting speeds for gear retraction/ extension/ extended as they did in the past


They have standardized on 270/.82 for all three
Have they announced what speed this beauty is going to cruise at yet?
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Old 30th Jan 2020, 21:49
  #89 (permalink)  
 
Join Date: May 1999
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Originally Posted by RexBanner View Post
Have they announced what speed this beauty is going to cruise at yet?
they won’t know for sure until the flight testing programme is complete.
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Old 30th Jan 2020, 23:39
  #90 (permalink)  
 
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Originally Posted by RexBanner View Post
Have they announced what speed this beauty is going to cruise at yet?
Pretty sure the target is Mach 0.84 - 0.85, but as 3Greens notes, the flight test results will be the final determination.
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