John I flew my shrike 10 las weekend and have the same engine on mine - I was flying a 7x5 MAS on it because it was about all I had in the right range. I was running 20% fuel on a cool day.
Wasn't able to tach it, but it seemed a little under propped, I'm planning on experimenting with a APC 7x5 , 7x6, and 7x7 see what pulls it around the best.
