RE: Terry - "Improved" propeller gap design

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>

 >>Seriously, I had come up with a design improvement similar to your
 >>suggestion of using a split shaft-collar to secure the tungsten rod.
 >>Instead of using a shaft collar captured in a slot in the hub, why not
 >>just make the hub itself have the split-collar clamp built in?

 >I like the idea of silver soldering a collar on the rod.  Now you've got a
 >physical bump or lip to rest against a retention device that's loaded in
 >shear(safety wire, set screw, whathaveyou) rather than relying on friction.

Trouble is, the motor hub is typically made of a plastic that would melt as 
such a collar is soldered.  As Terry originally suggested, if it turns out 
that imbalances do tend to pull the rod through the hub (which has NOT yet 
been demonstrated), why not just apply a small blob of epoxy to the rod to 
constrain it on each side of the hub?  The temperature of the rod is not 
elevated at that point, and if you were really concerned about the epoxy 
slipping, you could file a small notch in the rod where the epoxy was 
applied.  Remember, the whole point of this design is to K.I.S.S.

Regards, Gary Lau
MA, USA