Dreamland
Try doing it on a twin and see where the voltage ends up especially on cold mornings. One of these days you'll have to explain to your pax that you can't go because you have drained the battery unnecessarily cranking over a PT6 after shutdown. Just park the aircraft into wind for shutdown/startup and if you really want to you can motor the engine an extra 5sec after max motoring speed before you introduce fuel. Try it and let me what the difference is in starting ITT/EGT.
I never flew Garretts but an engineer told me the reason for spinning the engine after shut down was to stop the main shaft from flexing once it had cooled down. I'd be happy for some experienced chap/chapette to confirm or deny this.
Last edited by flyhardmo; 22nd Sep 2014 at 05:43.
Reason: Added rant once sober