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Old 07-22-2008, 01:05 AM
  #135  
victorzamora
 
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Default RE: Bernoulli vs Newton

ORIGINAL: Tim Green

I think the great thing about this experiment, is that it allows us to draw conclusions, without calculus. Thus logic is sufficient in this case, to prove that it's the air's momentum that provides the lift.
HOW?? The chopper is trying to lift itself PLUS a plate that weighs as much as the total energy of the air it's deflecting! I'm using "weight" not as in Kg, but as in Newtons....the way "weight" really is, not mass.


BMatthews: It's all good, I'm just glad I was able to FINALLY express that point well.
Tall Paul: a 747's wingspan is ~225ft....so at about 250ft AGL, the plane is essentially one wingspan above the ground. I'm NOT saying that it stops at 1 wingspan, I'm just saying at around one wingspan. As BMatthews said, at 2 or 3 you cease to feel the wind. I know from personal experience.