Aircraft carriers - ramps - makes less than zero sense to me

Discussion in 'Physics & Math' started by Jonathan Ainsley Bain, Apr 11, 2022.

  1. phyti Registered Senior Member


    In the video I watched a pickup pull a portable 'runway' in the -x direction while a pilot flew his small 'cub' class plane off the 'runway' in the +x direction. Takeoff speed would have been approx. 50 mph. It is a real world demonstration that it can be done, and without any sophisticated high tech preparation.

    Whatever the source of the mental block, lack of in depth analysis, fixation on one factor over all others, etc., seeing is believing.
    It isn't necessary to remove friction, and it's needed if the pilot wants to apply brakes.

    My error is to visualize the typical conveyor operation of moving material, which is held in place by friction. If a small cylinder is placed on a sheet of paper, and the paper is slowly pulled in the -x direction, the cylinder, having near zero contact with the paper, will acquire a small torque around its center, causing it to roll in the +direction, contrary to typical conveyor operation. The wheel is the cylinder in the airplane case and it is rotating in the +x direction. The motion of a conveyor belt can only increase its rotation rate via friction. Yes these factors were mentioned, but understanding comes when you can explain it to yourself.
    billvon likes this.
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  3. exchemist Valued Senior Member

    Ahhh. The ghost of Motor Daddy is laid to rest.................

    Please Register or Log in to view the hidden image!

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  5. Neddy Bate Valued Senior Member

    Motor Daddy took his super-human knowledge of physics with him, wherever he went. We shall never know his secret. I still have faith that phyti will continue to do physics like MD in the future.
    Last edited: Apr 25, 2022
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  7. Motor Daddy Valued Senior Member

    I hear he's been hanging out here:

    Come join me...I mean him... LOL

    Hi Neddy!!!

    The sides are 1.77...units, which is close enough! Done deal! A thing of real beauty!
    Last edited by a moderator: Apr 25, 2022
  8. Doc Collins Registered Member

    No horizontal velocity is created, in fact, velocity increase rate, if not actual is decreased as soon as the aircraft encounters the ramp. All that is "created" is altitude with provides distance from the sea allowing a bit more time for acceleration to flying speed. Given the effects of temperature, barometric pressure, weather, weight, etc. on lift thus required flying speed, the ramp concept limits operational capability. The catapult can be adjusted to overcome all variables to achieve the required speed under any conditions and reasonable loads.
    That's why America used catapults. Ramps are cheaper in construction and require little maintenance. That's why the others use them.
  9. Beaconator Valued Senior Member

    Turbos dont exactly have gears
  10. Beaconator Valued Senior Member

    that’s like a car hitting the red line

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