# Can anyone explain this?

53

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

## 53 comments on “Can anyone explain this?”

1. Roland says:

Looping

2. Anonymous says:

Same as spinning a bucket of water. Centripetal force makes the water flow in the direction of the force.

• Geodetective says:

<- this…

G-force in case of looping is upward, and overrules gravity.

• Anonymous says:

Centripetal force is opposite….centrifugal foerce keeps the flow

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.

What is there to explain?

4. Barrel Roll!

5. andyb says:

It’s not water but plastic?

6. arjay says:

It’s Ice, man.

• Cymon says:

I wish I could thumbs up this reply.

7. Fotoflex says:

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

• Skyfire says:

Looks more like Dr. Evil in an early stage to me…

8. Tony Bellini says:

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 !

• sirkitkat says:

So you suggest a glider can’t perform a looping?

• Yat says:

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

• Tony Bellini says:

Didn’t say loop, said high speed barrel roll – BIG difference.

• Turd says:

Tony Bellini almost full retard

9. gilles says:

A reflection on the top of the plexiglas of the plane

10. joeyhun says:

radial forced pilot personality (a flight psychologist @codexmonk!-)

11. Dharmaruci says:

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

• Anonymous says:

Nice!

12. ctj says:

it’s called the “hang loose” sign. you extend your thumb and pinky. it comes from hawaii.

13. Steve Jones says:

If that needs explanation, then something has gone wrong with the education system…

• Dave says:

Yet you still fail to explain it.

14. jerry says:

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.

15. There is a “bottle” in the cup and he has just managed to match up pouring from the cup into the visible bottle

16. Anonymous says:

The Principle of Equivalence

17. Mason says:

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

18. Rhett Allain says:

Why doesn’t the water fall (accelerate) down? It does. It’s just that the plane is accelerating down with a greater magnitude so that it “catches up” to the falling water. From the reference frame of the plane, this makes it look like the water is pour up.

I looked at a very similar situation a few years ago – http://www.wired.com/wiredscience/2010/08/pouring-tea-in-a-plane-upside-down/

19. carlosnz says:

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.

• Eddie says:

What are the basic equations that govern the manoeuvre?

• joeyhun says:

It’s impressive. Minor difference is that it is a roll and the original one is a loop. Never mind, G force is G force anyway…

20. Zev Eisenberg says:

Hollow earth. Ground above, sky below. And those guys are probably lizard men.

21. issahamati says:

nice one

22. jerry says:

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.

23. Zoe Butler says:

Quite simple. General relativity.

24. John says:

I think the earth is reflecting off of the glass and that they are sitting up straight.

• Turd says:

another almost retard

25. Skatz says:

The guy’s obviously thirsty.
…or are you talking about the pouring thing and why the earth seems to be curving the wrong way?

26. Stevenz says:

Mason above is right. But who’s flying the plane? The character in the back obviously isn’t.

27. Just Mike says:

You all got it wrong. It’s obvious he’s pouring the water into the bottle from the cup!

• jerry says:

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!

28. just says:

they are Tunisian beacause the brand of the water and they are pouring it from a cup

29. Obviously they’re Australian.

30. Robotskdk says:

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.

31. Rich says:

Centripetal force. The shot is taken during a loop or similar manoeuvre.

32. Nitwits

33. Peter Leeson says:

It’s a photograph.

34. ford brett says:

The question is: “Can anyone explain this?
The answer to the question is: “Yes”

• Turd says:

finally someone got the answer right

35. Chris Emerson says:

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…

36. Anonymous says:

Pouring water into the bottle

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