Just got an email from Espritmodel.com for their $$$$ Kontronik motors. This one has only an 8 mm shaft for a 10KW motor. The motor only has 14 poles. Just can't visualize a 28 inch diameter prop on that size shaft.
Am I correct in assuming these motors are designated for helicopter use?
Yes, that's a heli specific motor. The shaft is long because it's designed to be supported at the end by a bearing that is mounted in the frame of the heli, so it doesn't have to put up with the bending moments that you get with a prop. I have a similar spec motor in my 700 size heli.
Heli motors are also higher Kv than similar power fixed wing motors. The one you linked is for 12-14s and has 480Kv, so up to around 25,000RPM... far too high for a direct drive prop that's big enough to take that sort of power.
You could use such a motor in fixed wing with a reduction gearbox.
To be honest Denny, I had already reported that post before asking you about it here. Within 10minutes it was moved to the RCG bitbucket.
It's not the first first post, copy/paste message I reported. Annoying.