From the little bit I've gathered so far it seems the DF .45's seem to get along with square to a bit oversquare props around 7.5" diameter. Is that QM prop territory or thereabouts? Steve was certainly on the ball when I spoke to him about .25 DF engine prop choices, and he has a whack of choices for .40's of all breeds. Elsewhere ILJ mentioned running 6.5x10's on DF .45's on F3S type stuff, but man you better have almost negative frontal area for that kind of prop.. [:-]

MJD