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during take off

  • 31-07-2015 8:20pm
    #1
    Registered Users, Registered Users 2 Posts: 313 ✭✭


    Newbie question ..Wats that feeling 15-20 sec into take over when you feel likea Aeroplane is going backwards or dropping a little... I don't think it's turbulence more like thrust been lowered??

    You guys are the experts thought I'd ask


Comments

  • Registered Users, Registered Users 2 Posts: 18,367 ✭✭✭✭JCX BXC


    My last takeoff was a reduction in engine power, a sharp turn and turbulence, so I'm not really sure what I was feeling :)


  • Registered Users, Registered Users 2 Posts: 313 ✭✭jackstaff


    Ye no that feeling off dropping were you clinch your butt only last couple seconds


  • Registered Users, Registered Users 2 Posts: 18,367 ✭✭✭✭JCX BXC


    jackstaff wrote: »
    Ye no that feeling off dropping were you clinch your butt only last couple seconds

    No..........


  • Registered Users, Registered Users 2 Posts: 6,562 ✭✭✭kub


    Great question OP, I always thought it was a change in the original climb rate of the plane, as in since it lifted off the runway.


  • Registered Users, Registered Users 2 Posts: 313 ✭✭jackstaff


    Ah come on dont leave me hanging here...

    I'll wait for an expert pilot


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  • Registered Users, Registered Users 2 Posts: 60 ✭✭CúilChip


    It is the flaps being raised. Flaps are extended to give more lift during take off. but are then raised as they also cause drag during flight.


  • Registered Users, Registered Users 2 Posts: 313 ✭✭jackstaff


    CúilChip wrote: »
    It is the flaps being raised. Flaps are extended to give more lift during take off. but are then raised as they also cause drag during flight.

    See that now !! Simple answer that makes it all more understandable thus less scary !!
    When I'm taking off in September with Ryanair il stand up and say chill everybody it's just the flaps ...


  • Registered Users, Registered Users 2 Posts: 114 ✭✭Alpha Romeo


    It's the engines being reduced to climb thrust


  • Registered Users, Registered Users 2 Posts: 1,363 ✭✭✭Negative_G


    CúilChip wrote: »
    It is the flaps being raised. Flaps are extended to give more lift during take off. but are then raised as they also cause drag during flight.

    Likely. Coupled with the retraction of the gear which causes massive parasite drag.

    Generally the gear is raised once a positive rate of climb is confirmed by either the rad alt or altimeter or combination of both.

    Once the gear is raised with the doors closed the second segment begins which sees the flaps retracted once a speed and altitude has been reached which can vary between operators.


  • Registered Users, Registered Users 2 Posts: 313 ✭✭jackstaff


    The flaps been brought back seems most logical to me some great explanations guys


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  • Registered Users, Registered Users 2 Posts: 3,520 ✭✭✭VG31


    Am I correct in saying that the aircraft isn't actually dropping but has just slowed down so it feels like the aircraft is dropping?


  • Closed Accounts Posts: 4,029 ✭✭✭shedweller


    OP did you mean when the plane is still on the runway but just about to lift off?
    If i'm down the back i notice a large drop as the plane rotates. Then the huge lifting sensation.
    The dropping sensation is because the back half of the plane pivots down as the pilot raises the nose.


  • Posts: 0 [Deleted User]


    jackstaff wrote: »
    Newbie question ..Wats that feeling 15-20 sec into take over when you feel likea Aeroplane is going backwards or dropping a little... I don't think it's turbulence more like thrust been lowered??

    You guys are the experts thought I'd ask

    http://www.amateurphotographer.co.uk/forums/showthread.php?111927-Long-Exposures

    OP 2nd image down on that page shows you a night time takeoff, after takeoff the nose pitch is reduced to help the aircraft accelerate, as it accelerates the pilots retract the flaps on the wings that help increase lift at slower speeds, as these flaps retract back into the wings, this cause a reduction in the rate of climb that lasts for a couple of seconds and makes you feel like you are falling slightly.

    The long exposure picture shows clearly the "steps" in the climb out when each stage of flap retraction happens.

    Hope this helps.


  • Registered Users, Registered Users 2 Posts: 313 ✭✭jackstaff


    http://www.amateurphotographer.co.uk/forums/showthread.php?111927-Long-Exposures

    OP 2nd image down on that page shows you a night time takeoff, after takeoff the nose pitch is reduced to help the aircraft accelerate, as it accelerates the pilots retract the flaps on the wings that help increase lift at slower speeds, as these flaps retract back into the wings, this cause a reduction in the rate of climb that lasts for a couple of seconds and makes you feel like you are falling slightly.

    The long exposure picture shows clearly the "steps" in the climb out when each stage of flap retraction happens.

    Hope this helps.

    Couldn't have been answered more clearly.. thanks a lot I understand now

    Ps them long exposure shots are class


  • Registered Users, Registered Users 2 Posts: 78,574 ✭✭✭✭Victor


    In the moment that the aircraft is changing from a steep climb to a less-steep climb, your vertical speed is slightly higher than the aircraft's vertical speed


  • Moderators, Motoring & Transport Moderators Posts: 10,005 Mod ✭✭✭✭Tenger


    .....

    OP 2nd image down on that page shows you a night time takeoff,.......

    The long exposure picture shows clearly the "steps" in the climb out when each stage of flap retraction happens. ...

    Thats an amazing image.



    I think the OP is referring to the engines thrust being scaled back after rotation. After the push into your seat the reduction in G force would seem to be stopping.


    You can sometimes get a similar sensation when you climb in the cruise. The aircraft goes nose up and you feel a slight 'stop'


  • Posts: 0 [Deleted User]


    Yeah could be Tenger.

    I've seen a few long exposures so knew there was some online that would ale it easier to understand my explanation.

    Easy enough to shoot, done a few long exposures in NYC, as long as you can get rid of ambient light sources so it doesn't over expose your **** it's child's play.


  • Closed Accounts Posts: 821 ✭✭✭eatmyshorts


    ... so it doesn't over expose your **** it's child's play.

    I hate over exposing my **** too! :)


  • Posts: 0 [Deleted User]


    I hate over exposing my **** too! :)

    LMAO having the I beside the O was never thought about when QWERTY was dreamt up, especially when trying to spell shot ;-)


  • Registered Users, Registered Users 2 Posts: 8,641 ✭✭✭cml387


    In the olden days with earbuggeringly noisy engines there was a thing called noise abatement procedures, which involved a steep turning climb with the engines throttled back as much as you dared.


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  • Moderators, Motoring & Transport Moderators Posts: 10,005 Mod ✭✭✭✭Tenger


    I do miss those days a little.... I remember being behind Concrode at LHR and the skipper having to make a "dont be worried when our aircraft shakes, it's just Concorde"


  • Registered Users, Registered Users 2 Posts: 313 ✭✭jackstaff


    Tenger wrote: »
    I do miss those days a little.... I remember being behind Concrode at LHR and the skipper having to make a "dont be worried when our aircraft shakes, it's just Concorde"[/QUOTE

    Would u b a pilot tenger ?


  • Banned (with Prison Access) Posts: 1,385 ✭✭✭Preset No.3


    jackstaff wrote: »
    Tenger wrote: »
    I do miss those days a little.... I remember being behind Concrode at LHR and the skipper having to make a "dont be worried when our aircraft shakes, it's just Concorde"[/QUOTE

    Would u b a pilot tenger ?


    How dare you!!!!!!! Tenger would be a common pilot!!!! He's far more important than that!!!! 😝😝😝


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