My 9.6v battery finally finished charging. I got between 15,500 and 16,000 with the APC 5.7x3 prop. The little markings on my Ace Tachmaster are in 500 rpm increments and the needle sat right between those two readings. So I'm going to say it turns the APC at a steady 15,750. That's not too bad for a $9.29 motor. I am confident that it will fly my Randolph Bee-Tween very well.

http://www2.towerhobbies.com/cgi-bin...?&I=LXHHN1&P=0

I just wanted to add that the APC 5.7x3 that I used is a GLOW prop, not an electric one. I'm trying to remember what people were getting with the AP Wasp .061 throttled engine. I seem to remember it being around 16,000. The ESC provides very smooth reliable throttling of this little GWS motor. The drawback, of course, is that performance starts to drop as soon as you start draining current from a battery.