The only size I've run is a 14X6 on an OS 95AX in an AeroWorks Extra 260. That same plane has had an APC, XOAR, MA Classic, MA Wood Scimitar, and the EVO. The only ones that are close on that plane are the APC and XOAR. The XOAR is slightly better at pullout from hover and the APC is about the same as the EVO in most respects. On another plane with the OS 95AX, a Goldberg Tiger 2, the MA Classic pulls much harder from a dead stop and is slightly faster in level flight when clocked by radar. That's one I didn't see coming. I figure the increased pull down low and slow is the flex causing a lower pitch. I have NO explanation for the increased speed in the air other than somehow it just works better with the engine/airframe combination. Go figure, just when I think I have something figured out. LOL