ORIGINAL: RC_Fanatic
Well, I finally got through to Fred at APC. Not the chattiest guy. Pattern and sport props are now the same. The pattern ones used to be heavier to cope with the impact loads from engines running too lean. The pylon props have a heavier hub, presumably to cope with the higher power from these engines, and the higher rpm's.
As for balancing, he mentioned drilling holes in the hub and adding lead weights (!) Another option was to put lead in the recess in the hub. Seems odd to me! Other options are to sand the front of the heavier blade, or add some CA to the lighter blade. (I use clear nail polish. It seems to stand up pretty well.)
Guess I'll order a selection of props and see what works best.
Hey thanks for asking about the balancing. I generally opt for sanding but wondered if that method was recomended or discouraged by APC, however not enough to make a call.