I've broke my DA50's in on Mejzlik 22 x 10 @7200 rpm or so...........Bolly wood 22 x 10 @ 6600 rpm, and I tried a Bolly wood 23 x 8, but only got 6300 which was a bit too much of a load and I didn't like the way the plane (WH Edge) performed. I nipped 1/2" off each end of the 23 x8 and made a 22 x 8 out of it. RPM's came up to 6900 or so and much better performace.....