Almost as troublesome as the choice of "Paper or Plastic", is the choice of a prop.  For my ES-P I have chosen the 400 hp TSIO550 by Performance Engines.  The prop is another issue. Many, perhaps most, of the TSIO500's flying are swinging a Hartzell of some vintage.  Their 3-blade scimitar is a good match but a few builders, and Performance Engines, are really enthusiastic about the offerings from MT.  Recently MT developed their 4-bladed scimitar and it seems to work well on large engined certificated and experimental aircraft.  Could anyone on the LML compare and contrast these two offerings? Robert M. Simon,  ES-P N301ES