ORIGINAL: desertpig
The best props to use on this engine are a Menz or Bolly Wood 22x8, Mejzlik CF 23x8 or NX Wood 23x8 Don't use a 22x10 - too much prop.
If you don't believe me on the RPM or the props.. call DA.. that's right from the horse's (er, Brian and Dave's) mouth...
DP
FWIW, my DA50 on stock muffler turns a Mejzlik 22x10 at 7200. IMO that's not too much of a load..........