Ron T brought this picture to my attention….. any ideas?



    1. No such thing as centrifugal force, a common misconception. There is only centripetal force. There is also normal force. A cup or bucket would be providing the normal force. Just imagine the cup suddenly disappeared mid up swing, the water would fly out at an upward trajectory. At the top of the swing, it has only velocity perpendicular to the arc which means no vertical component of velocity.

  1. The guy in the back? He’s playing his air guitar. The guitar solo from ‘Bohemian Rhapsody’, I think. Nothing else needs explaining.

  2. Small slide window in canopy suggests this is a glider (so no high speed barrel rolls) Ground “above” canopy is just a reflection so he is just flying straight and level and enjoying a Gin and tonic – as you do !

    1. The ground “above” is not a reflection. We can see the actual reflections. Are you suggesting the cockpit renders two superimposed reflexions ?

  3. it is an areoplane. heavier than airflight has been possible for humans for almost now 100 years. many books explain the concept.

  4. the aerobatic maneuver is a loop.
    Cetripetal force is actualy towards the center of a circle.
    The airplane is flying to the water faster than the water is falling to the earth.

  5. Bob Hoover was a great aerobatic pilot. During World War II when the P 51 was being shot full of holes he would go to the front And get in the most shot up airplanes and do aerobatics to demonstrate the strength of the airplane built by North American. This is not him. But if an aileron roll is correctly done, the G loading will keep a constant 1G and you can be inverted and pour liquid from a glass to glass or bottle to glass

  6. Some of these comments seem rather confused. It’s just a roll while maintaining constant 1g.

    Here’s what the whole manoeuvre looks like:

    Impressive, but very basic physics.

  7. I believe that even in a coordinated roll the slip string (yaw string) on the canopy would be deflected, therefore my guess is loop vs roll.
    Neverless, to mention g’s is misleading. The liquid in the air is acted upon by one force only…that of gravity. The maneuver of the aircraft relative to the naturally falling water creates an appeance of a stonger opposite force.

    1. To the reverse water flow theorists I say look closely at the water bottle. It is filled with water lying flatly in the bottle on the side closest to the bottom of the airplane. Therfore held in place, opposite the earth side of the bottle by g forces produced by the component vector forces created by the acrobatic manuever.
      If the airplane were flying in level inverted flight the water would pour towards the canopy.
      Notice also the water flow at the bottle opening is small and lamineer, at the cup the water is wide and burbleling indicating the bottle as the source of flow and cup the destination of the flow.

      Quite elementary!

  8. They must be flying faster than the speed of water. Or, it’s so full of iron that he tapes a magnet to the bottom of the cup he’s pouring it into, so the magnet has enough force and friction to hold the water and iron together.

  9. Gliders can do aerobatics of course, including loops, rolls, flick rolls, barrel rolls (There is probably not a single aircraft in the world that couldn’t do one of these – it’s 1g all the way round!). It is likely a homage to the Bob Hoover video posted above, with the iced tea.

    The glider pilot in me though is now trying to work out the answer to a different question… What type of glider is this? I doubt anyone else would be interested in answering that though…

  10. 6) Use grey duct tape or mastic to seal duct at the supply air and bypass damper joints to prevent air leakage. It helps to thin the nasal secretions and makes suctioning your baby’s nose a lot more effective and quicker.

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