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Action and Planck's constant

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Action has the dimensions of energy times time. We can construct an energy from d, m, and t as follows. First we construct a velocity:

v = d/t

Then we can write down a quantity E with the dimensions of energy:

E = m v^2 = m d^2/t^2

Finally, we can construct a quantity S with the dimensions of an action:

S = E t = m d^2/t

Jet engine: The turbine blade have a mass of, say, 50 kg or so (I'm guessing they are a few meters long, a few centimeters in thickness and perhaps ten ...

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