I turned it for one full revolution of the chain, so I guess it's not a bent piston / rod etc.. (mechanics.stackexchange.com)
RPM (Revolutions per minute) is a unit of measurement of how many full revolutions (360 degrees) an object makes over time. (mechanics.stackexchange.com)
Until now, Blue Origin's rockets had been designed to go into suborbital space, which entails flying more than 62 miles above the earth's surface, but not high enough to make a full revolution. (inc.com)