Jet Steam Stream Hitting Curved Vane

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“If a jet with the velocity V strikes the bucket at an angle a, its velocity A B could be resolved into two components —one C B at right angles to the shaft, and one C A parallel to the shaft. The one at right angles to the shaft, commonly known as the velocity of whirl, would produce a rotative impulse equal to Vcosa, and V1, the velocity of the vane necessary for maximum efficiency.” —Derr, 1911

Source

Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)

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