Posted for Kevin Kossi <kevin@airforcemechanical.com>:

 I toiled over the same decision and heard: The MT propeller is not  nearly
efficient as the Hartzell on the Legacy.  If you want to see  some real data,
look at the Reno Air Races.  Dave Morss has an MT  propeller.  He used his
propeller except for the last race, and put a  Hartzell on his plane.  The
difference is staggering!!
 
 Apperently the Hartzel for the Legacy was specifically desighned for  the
Legacy.
 
 I also looked at the Aero Composites Prop and found it's construction
 amazing.
 
 It's a hard decision, as there does not seam to be any hard  engineering data
to compare side by side.
 
 
 Kevin Kossi
 NYC
 Legacy 50%