http://www.hobbyhot.com/AEO-Model-1550KV-Contra-rotating-Brushless-Motor.html

What its mean ?

Are you trading this motor ??

These are also available on HK, what is purpose of these motors ? in what application we can use them and necessary to use them ?

Many Thanks in Advance 

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16617


http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6565


http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10591


http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=17164


http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16618

these motors are mainly used in multi rotors applications.. these types are good when used with a balancer electronic measures, to avoid any counter torque.. very best for to make hover craft also.. as lift fans.. and not a wonder as we can configure two identical motors any type for this purpose in easy way.. and a gyro holds the unwanted, unbalanced rotations..