I'm flying a 11x6 on a baffle-less .46ax in my Mustang. 13K and change static, ready for flight (500 off peak) unloads to over 17K in the air! 60 flights or so so far, most WOT from start to finish (she's a "speed plane").

The .46 is no wimp, and is very capable of high speed operation, something the larger AX series is less well suited to, including the 55. These 55 and larger AX engines are tuned for big prop torque, but the 46 (and hopefully the new 36 (i think it's a 36...)) are revvers!

J