I tried a couple of different props on the little .30 just now.
Fuel===WildCat 10% full synthetic 18% lube.
Plug===Fox Miracle
Prop===Taipan 9x6 rpm==picture #1
Prop===MA 3 blade 8x6 rpm==picture #2
I don't think I'd fly either of those props. I guess the 10 or 10.5" Bolly's and or Graupner's are best.
Dan, I believe your the only person on planet Earth who stumbled onto a good setting for those poor excuse' for pumps. Not trying to be a bad guy.