Prop adapter for 29mm outrunner

I snapped the shaft off my engine on a bad landing, so rather than toss the motor, I made a shroud-like prop adapter to go around the engine, and with the addition of a six mm bolt and some handy 4mm nuts and bolts, hey presto, prop adapter.
V2 My engine was getting to hot so I added a turbine colling system to the shrouded part, but not sure if this helped, because my engine still got too hot and melted off.
( I was running an emax with waaay too much prop )