Fair enough TU.144, thanks for the type specific info. I confess I am surprised at the 220 RPM though. On our turboprop, feathering the prop with the engine running gave a lazy "hardly turning at all" effect, especially in level cruise, where the propeller really would stop - presumably because the airflow over the blades completely overcame the residual torque on the power turbine. If you slowed down, the prop would start slowly turning again. At the other extreme (stationary on the ground with the propeller feathered) it would go around at a fair clip - but even then I'm not sure it was 220 rpm.