RE: K&B Sportster Club
I had acquired some of those 11x10 and 11x11 props a while back on clearance sale at one of our local hobby shops.
The size was popular on the old Drone .29 engines way back when. The engines didn't rev up high, so you needed a higher pitch prop, if you needed the speed.
I used some years ago on a plane that didn't have the ground clearance. It worked OK, but the landings were faster as the higher pitch prop doesn't help the plane to slow down though. It was on a pattern plane design anyway, so the landings being faster wasn't a problem. But it could be for some planes though.