787-9 Cruising Speed

Hey IFC, what is the cruising speed of the 787-9? I need to know the mach and IAS.
Thanks!

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Mach 0.85

If you get your speed to 320kts prior to passing FL280 you will be at M0.84 after you pass FL280

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I normally cruise between Mach 0.84 and 0.85. For Mach 0.84, I set my IAS to 317, and then climb past 28,000 for the switch to Mach. Then, I switch to Mach 0.85 as needed.

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Did someone mention “crushing”? 😜look at the title

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IAS and Mach are completely different things. IAS measures airspeed while Mach is groundspeed. The IAS for Mach 0.84 changes based on the winds.

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On that note I am not sure what the crushing speed of the 787-9 is…

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Oops. Did I accidentally say "crusher"😆

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For me it is Mach 0.86. I feel that that is pretty safe.

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The Boeing 787 and 747 cruise at M0.85 (320kts IAS). The A350 cruises at M0.86 and the A330ceo cruises at M0.84 (ish).

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The A350 normally cruises at Mach 0.85 and the A330ceo at Mach 0.82

The 747-400 at 0.85 and 747-8 at 0.855 (0.86). Lastly the 787, which cruises at 0.85 but the economical cruising speed is 0.87, meaning at this speed, you may reach your destination slightly faster and save a little more fuel in the long run.

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I believe according to boeing.com the crushing speed of the 787 is about 140kts on short final with an A380 on taking off immediately ahead of you and a 747-8 coming in right behind you. The crushing speed at cruise is roughly 42069kts at Flight Level: Space. I could be wrong though, I’m not the one who designed the plane.

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The most optimum speed is Mach 0.84 to 0.85. At FL280, this can be intercepted from 316 IAS to 320 IAS. You’ll be impressed on how efficient the 787 is at these speeds.

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DeerCrusher Meme
@DeerCrusher

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