Neat job Kim! One thing that has always puzzled me about motors with fans up front is how they get cooled. Is it that the air is sucked in through the rear and blown out through the centrifugal fan up front?

Keith R

Kim: why not just make a thin "washer" to present a hard surface for the motor to mate to, then bolt through that to the firewall?  That way the epoxy is only providing a "bed" to interface between metal and wood, and doesn't have to supply the strength to actually hold the motor in.

Hi again Lauri,
So we find a happy accident.
The tapered collet prop drive washer is a well used design, but a number of flyers have had problems with them in electric Stunt and R/C.
The biggest reason is that the shafts on electric motors tend have smaller diameters than glow engines.
Also, some flyers did not appreciate:
1) the need for extreme cleanliness on the mating face of the shaft and collet, and
2) the need to compensate for loosening as the propeller hub crushes.
Together we have possibly solved #2. A spanner wrench to hold the spinner backplate would allow very secure tightening of the nut behind the prop.

I trust these pieces will, one day, be available for sale?

Dean