These motors rock, 65mm props on 1s 600mah Tattu pack they R making more thrust then the 10500KV Racerstar 8520's for the price they rock!
Amp Draw is manageable on 55 or 65mm props.. on my Race rigs i fly Micro Motor Warehouse Dark Edition 8520s and VooDoo quads 8520s.. the VooDoo motors are the fastest 8520s money can buy and they cost, 34-36 dollar per set +3.00 shipping. They give about 1.5 hours of life at peak power and will start to fall off after 1.5 hours and your total life out the motor is about 3 hours if you give them time to cool between flights...
Now on to these motors, at 1/3rd the cost per set these on 65mm props give about 75-80% the power of the VooDoo motors and MMW Darks.. they also pull only about 2/3rds the peak amp draw of the VooDoo motors or the MMW Darks, that's a HUGE deal as you can use the same battery will come close to making up the power difference... I can tell you that on a 51 gram build these motors are fast on 65mm props.. they are a heck of a deal for 8520s... USAQ has brought us a well priced 8520 that flies well, makes pretty good power, easy on batteries and only cost 13 dollars a set!
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