Lift fan mounted with shaft key and axial bolt

After all my trouble with the collet slipping I have upgraded the fan mounting technique.

I ordered some shaft keys since both the shaft and collet are keyed. And I also ordered some 3/8-24 bolts to thread into the end of the engine shaft. And I modified the outside mounting plate with a center hole to allow it to bolt to the end of the engine shaft.

The blot ane key fit checking

The key fit in nicely. Though surprisingly the woodruff key I ordered was the wrong size. I didn't expect that it and the may key would be different width. The main keyway was 3/16" but the woodruff key slots on the back were clearly 1/8". But the collet was also 3/16" so that works better.

The 1-1/4" was the right length to fit in.

Key fit check

The face plate modified with a center hole for the shaft end blot.

Fully Assembled hub, with the new plate visible between the hub and the propeller assemble. 

An external view of the assembly

I identified that the grill housing is going to be vibrating against the engine mount, but listening to the running sounds I think it's a minimal amount of the noise of the system. 

And finally the moment we've been waiting for. The test!!

It worked quite well. I hovered much higher than I can really remember except for a brief moment in one of the recent tests as I got the hub super tight. Which suggests to me that it was never really not slipping previously.

This is great! I'm looking forward to more tests soon!