Does Betz Law Apply to Helicopters?

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Does Betz law apply to helicopters? I.e will maximum 59% of power supplied by an helicopter actually provide lift?
 
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Betz law applies to turbines that extract energy from a moving gas or fluid, it doesn't apply to propellers or rotors that add energy to a gas or fluid.
 
Thread 'Question about pressure of a liquid'

Thread 'Question about pressure of a liquid'

I am looking at pressure in liquids and I am testing my idea. The vertical tube is 100m, the contraption is filled with water. The vertical tube is very thin(maybe 1mm^2 cross section). The area of the base is ~100m^2. Will he top half be launched in the air if suddenly it cracked?- assuming its light enough. I want to test my idea that if I had a thin long ruber tube that I lifted up, then the pressure at "red lines" will be high and that the $force = pressure * area$ would be massive...
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