Jester,

I dont actually make anything "blunt". When the GRP comes out of the die, there is a burr (similar to when you cut a metal sheet). I just remove that. So that if you run your finger lightly over the trailing edge, you dont come back with a cut. It is still very sharp. I get lines on my left palm from the prop (even old used ones) when I try to install or remove them. If you press hard on the prop, you will still end up with a mark. I am sure that the burr doesnt add to aerodynamics of the prop, more likely it adds drag through the production of turbulent vortices at the trailing edge.

Anyway, I am opening an new can of works: which prop balancer is the better- fingertip type or some other?

Ameyam