As I've said before in this post about NTM motors, I use them in a few of my mid-size drones. I think that in the 400mm to 500mm range, these motors perform well enough to fly recreationally and as long as you stay out of dust and land with the right side up, they won’t disappoint.
Turnigy produces a line of motors called “NTM”. Those are low cost brushless motors that are suitable for medium sized multicopters. At the time of this writing, these motors sell for around $15 each on HobbyKing. Since I’ve seen quite contradictory comments at various fora, I’ve decided to add this post to the confusion.
The Turnigy Multistar 4822 690Kv is part of a line of pancake motors designed to drive large propellers at slower speed. This is precisely what you need when building mid to large size quadcopters such as my 650mm quad.