The relative peripheral velocity of blades in two adjacent rows, with respect to each other, is high.
2.
B . G . Lamme described in 1912 a homopolar machine rated 2, 000 kW, 260 V, 7, 700 A and 1, 200 rpm with 16 slip rings operating at a peripheral velocity of 67 m / s.
3.
Note that while the angular velocity is, ideally, constant, the peripheral velocity of the moving groove against the stylus is not, varying for instance from approximately 50 cm / s down to 15 cm / s from start to finish of a 33 rpm, 12 " ( 30.48cm ) record.
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