Yep. Torgue was my only answer. It is just hard for me to believe that torque differences between a 24x8 and 24x10 change the plane's flight characteristics so much. I could accept it easier if it was a drastic change in prop size.

I run a 22x8 on my Evolution 45GX. A 22x8 would be way too small for the 58. Most people are running 24x10 or larger on these engines .. even up to 26x10. The 24x8 is borderline on being too small. I have been thinking about trying a 25x8 .... but haven't yet because TBM doesn't have any in stock. I haven't tached it in quite some time ... but I think I was getting around 67-6800 with the 24x8 and 64-6500 with the 24x10.

I have not owned any gas engines except the Evolutions (a 58 and two 45s) so I cannot compare them to anything else ... except by people I fly with having DAs, Brisons and 3Ws. To me, the Evolution is a great engine. Easy to start, easy to tune, dependable, and LOTS of power. The 45s are a bit on the weak side as far as design strength is concerned. I am yet to see one hit the ground that the cylinder wasn't broken where the muffler mounts ... and the X bar mount bent or broken. The 58 on the other hand seems to be VERY durable. I blew a base gasket on the 58 after about 5 gallons and Horizon replaced it. I think for the price (same as DA50), the 58 is a great engine. However, the 45 costs the same as the 58 ... so that is a bit expensive .. although it has the same power as other manufacturer's 50-52cc engines.