it's been a while since i tached it, i don't remember the numbers but i do remember that it was right at the max rpm for the motor, per the manuel. i been using it on a modeltech magic formula 3d which weighs about 6 to 6.5 lbs and it pulls it will ease. i do have other props like 13x6 but i thought the low pitch would really do well on this plane!!

mike