that is the question i have been asking i cant find any info on the eagle 50 motor. if the last number is kv/rpm on the rk-370sd-4045 then if you go here http://www.readyheli.com/Online_Head...ator_s/81.html and figure it. the motor should work with the right pinion. i would really like to see someone give us info about the motors. i mean im with you i burnt up 2 motors , i havent crashed it just the motor quits working and with the motor being 11.70 plus almost 10 bucks for shipping. and i have to wait a week to get them. and i just want to go to the lhs and buy a motor.