Originally Posted by
JammedStab
I'm not sure spinning the prop on a free turbine engine will do anything for you as the power section is not turning. . .
Yes, an important point on any free-turbine engine (PT6A, PW100 series, CT7/T700, T58 etc.) Turning the output shaft via the prop has no measurable effect of airflow through the core, because there's no mechanical connection. If the aircraft is parked into the wind, that's a little help, but the starter is the only thing that can make a real difference.