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How or is it Why planes fly?

 Here is a spoon

 

 

 

Here is the same spoon the other way up …if you conceal the handle,

the back of the spoon is not very different from the shape of a wing.

Here’s the fun bit…..allow the back of the spoon into the jet of water from your cold tap while holding the handle very gently and see what the spoon does.

 

Tips

  1. Hold the spoon vertically!
  2. Hold the spoon gently!
  3. Allow the back of the spoon to just touch the water!

 

Allow physics to do the rest.

Be the first to explain…..

 

 

COMMENTS

5 Comments to "How or is it Why planes fly?" add comment
admin September 8, 2012 at 8:00 am

come on it’s simple…..

admin September 8, 2012 at 8:00 am

look up Bernoulli’s theory

admin September 8, 2012 at 8:02 am

Bernouilli’s principle also tells us why windows tend to explode, rather than implode in hurricanes: the very high speed of the air just outside the window causes the pressure just outside to be much less than the pressure inside, where the air is still. The difference in force pushes the windows outward, and hence explode. If you know that a hurricane is coming it is therefore better to open as many windows as possible, to equalize the pressure inside and out.

Another example of Bernoulli’s principle at work is in the lift of aircraft wings and the motion of “curve balls” in baseball. In both cases the design is such as to create a speed differential of the flowing air past the object on the top and the bottom – for aircraft wings this comes from the movement of air over the top and under surface of the wing thge speed differential leads to a pressure difference between the top and bottom of the object, resulting in a net force being exerted, either upwards or downwards.

Sarah September 15, 2012 at 1:07 am

Just read up on this. It’s so fascinating! I’ve actually been shaping bits of aluminium foil and blowing them along my kitchen counter to see if I could replicate some of the stuff I read about.
Also it answered a long-standing question I’ve had.
Thanks :)
(Also, I feel like a nerd again (I used to be a chemist.))

PYR October 3, 2012 at 6:43 pm

Bernoulli does not explain everything unfortunately, it is a bit more complex but still understandable with Newton.

For a NON Bernoulli explanation of lift you can also look at a 10 min video on you tube at:

how do planes fly – a non Bernoulli explanation

http://www.youtube.com/watch?v=iM_8jcGp56A

It explains how lift is due to the wing moving air downwards (action) and lift is the reaction of air on the wing (3rd law of Newton).

I would say the explanation is given by the Coanda effect, see example of the glass of water underneath the stream of water in the video.
Thanks
PYR

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