Paul,

 

I found a picture of your plane and prop on www.Frappr.com/lancair.  That is a bit different than most props, fixed or not.  It looks like you have done a few other things, too.

 

I can see where the prop flat plate drag, stopped or rotating, would be less outside the frontal cowl area than other, more historically shaped props.   How do those thin blades produce enough thrust?