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Overspeed

  • 24-03-2011 08:09PM
    #1
    CaptainSkidmark
    Registered Users, Registered Users 2 Posts: 1,240 ✭✭✭


    How come on FS x when you reach 340 kts the overspeed buzzer comes on on a a320/330/737 etc when the cruising speed of a a320 anyway is 444 kts?

    Is there a way it can be changed?


Comments

  • #2
    Captain Chaos
    Registered Users, Registered Users 2 Posts: 11,178 ✭✭✭✭Captain Chaos


    340kts IAS or CAS and at what altitude. Cruise speed should be in Mach beside it. M0.84 or whatever.


  • #3
    Firekitten
    Registered Users, Registered Users 2 Posts: 4,205 ✭✭✭Firekitten


    The aircraft have operating speeds for certain altitudes... Overspeed, 'resistance' remains constant. The higher you are, the less resistance, thus, you can go faster. This is why the wee metal birdies fly at fl350, not 2000ft for airliners... You get where you're going quicker in lower resistance.
    Essentially, the overspeed warning is a warning of stress to the airframe created by air resistance. Too much, those wing things you love so much gain an unhealthy desire to rip themselves from the bit you're sat in.


  • #4
    loldog
    Registered Users, Registered Users 2 Posts: 634 ✭✭✭loldog


    CaptainSkidmark wrote: »
    How come on FS x when you reach 340 kts the overspeed buzzer comes on on a a320/330/737 etc when the cruising speed of a a320 anyway is 444 kts?

    At higher altitudes, the air is much thinner. So the air going in to the pitot tubes exerts less pressure, meaning that your IAS will be much lower than it would be if you were 3,000 feet. So while you may see an indicated airspeed of 265 knots at 35,000 feet, you may actually be travelling across the ground (groundspeed) at 540 knots. But at those speeds it best to use the Mach numbering, 0.84 Mach or so is a typical maximum cruise speed.

    .


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