Actually a 10x6 and an 11x5 are exactly the same performance wise. I have a book just for props and the performance numbers for a 10x6 and 11x5 are the same. My Nexstar which has an OS 46 came with a 11x5. After a few bounced landings it took a couple nicks out of the end of the prop. I now use an APC 10x6 which has the same performance just a little more ground clearance while im still working on greesing those landings.