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Commercial Low Supersonic (Non-SST)

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  • BHXUK1
    replied
    thanks for that

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  • TUNISAIR745
    replied
    Originally posted by Gabriel View Post
    Now, giving a groundsped in Mach is as ridiculous and meaningless as it gets.
    Exactly, it's the first time i hear about a ground speed in mach!!
    Can someone explain to me how this can be possible??

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  • Gabriel
    replied
    Now, giving a groundsped in Mach is as ridiculous and meaningless as it gets.

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  • AJ
    replied
    I've been Mach 0.91 in a 747-400 (Mmo 0.92) which was awfully loud. The 767 has an Mmo or 0.86.

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  • aaronacw
    replied
    Yes, its probably accurate as it is measuring the groundspeed of the aircraft, not the airspeed, and the jetstreams and gusts at altitude can mean the airspeed varies up to 150 or so km/h(afaik from watching the flight info program on too many flights.

    And yes, high subsonic speeds are possible on subsonic aircraft, with business jets being the most common aircraft in this speed range. An example is the Cessna Citation X, with a cruise speed of Mach 0.92. Im not 100% sure what the VNE for heavies is, but I think it would be above Mach 0.9. Dont quote me on any of this though, but im not a expert on this, so if I am wrong please correct me.

    Hope this helps
    Aaron

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  • thxcollins
    replied
    You're seeing groundspeed on Flightaware. Like pilotgolfer mentioned, with a tailwind it's possible to see even 1200kt speeds at times.

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  • pilotgolfer
    replied
    It's quite possibly because of the jet stream giving them an extra boost of speed in flight. That's what my guess would be.

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  • BHXUK1
    started a topic Commercial Low Supersonic (Non-SST)

    Commercial Low Supersonic (Non-SST)

    When on flight tracking sites, in particular flightaware, sometimes it will display a flight flying between mach .90-1

    1) Is this accurate?
    2) Are high subsonic (.90Mach) or supersonic speeds capable on subsonic aircraft, especially heavies?
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