rpm

It sounds more extreme than it is—“forced exercise” is simply tandem riding in which patients are required to pedal 80-90 RPM.

Later tests would put the rim through check-out tests to as high as 1.59 gee, but "normal" operation had been fixed at two RPM.

The out-of-balance fan, turning at close to 35,000 rpm, flew to pieces and the air cushion vanished.

Meanwhile, they kept up a jabber that sounded like a 33-1/3 rpm record being played 78 rpm.

Portions of the turbine also volitized; idling at eight thousand RPM, it became unstable.