Originally Posted by
BarracudaHockey
interesting. I always found the shaft on heli engines too short to get everything you need on there to mount a prop as they are made for screwing on a fan and prop bolt.
I remember for the ASP .36HR it was totally no problem: Propdriver fitted without issues and the threaded part of the shaft was long enough. Not overly long (I probably would not want to fit a spinner) but other than that zero problems. Not the nut hanging on on only a few turns or anything, easily full engagement.
Never tried the OS 37 though.