I suspect a lot of the comments concerning running a 9 x 6 APC prop is in reference to using in 424 class Q-500 racing.
For that class of racing the props limited to on that prop due to rules. For the most part the rule is fair and the airplanes are all equal with that standard.
For me the standard TT bearings work fine until the engine goes through a crash. After the crash the bearings have gone out on 2 of my engines. [
] The bearings don't seem to go out before then.
