APC12.25x3.75
90 degrees F
10%
12,300 rpm peak
12,000 rpm flying
Had the same verticle as the 11.5x4 with less speed.
This same prop and engine would pull my lighter 4* up forever. This plane weighs in at ~ 5.75lb. I think it will pull better when it starts to cool down. We had the hottest July on record this rear with May and June way above normal also.