I tested the 18x10 today to see what kind of rpms it would pull and was surprised to see I could only get about 6240 rpms with it. I will say it ran much better though becuase I was able to tune it better,but I still wouldnt have expected that much difference. I'm going to definetly have to get an 18x8. That should put me right about were I want to be. I think some of the big difference was caused by going from the 18x6w APC to the 18x10 WOOD prop. I think the apc's swing higher rpms then wood to begin with. I do like woods on gassers.