Just got this notification from Rotax this morning. Rotax recommends minimum 5200 RPM on WOT climbout. Less RPM is said to overload the engine and possibly induce pre-ignition/detonation, particularly at higher OAT's. So....... I was wondering what all the other RV-12 flyers were seeing for RPM on cimbout. My propeller is set to 71.4 degrees using the Van's pitch setting procedure. This setting yields a static RPM of 4850 and 5000-5100 WOT @75 knots( this was 2 days ago with OAT 60 F). Field elev is 1280 MSL and density alt was 1100, gross weight 1170# initial climb rate was 1000 FPM. Summertime numbers are similar but slightly lower with DA around 3000-3500. I understand this topic has been discussed before, but not in the context of a factory recommendation. Just to let you know, I have 25 years experience building, dynoing, racing and maintaining roundtrack racing engines from GSXR 1100 Suzuki's to Daytona 500( unrestricted and restricted). Not bragging , just want you to know I thoroughly understand many aspects of high performance internal combustion engine operation. I might have to do a plug check soon just to see if my engine shows signs of detonation. Anyway, I'd love to hear from other RV-12 guys about this.