Some questions you might have, since I hate leaving people dangling with a cool picture:
What controller do I use with such a thing?
Typically you'd use a >100A R/C aircraft type ESC, but because the motor is really capable of drawing several hundred amps, those without current limiting or torque control capability (basically all of them) are risky to use. The Castle Creations HV160 is a good example of one which can handle both the current and has protection.
Alternatively, if you pursue a sensored controller, the Kelly KBS
http://kellycontroller.com/kbs48121l...er-p-1172.html is about the smallest you can use. They have current control, but just rather low current, so you wouldn't be using the motor to full potential. Their KBL series (bigger) in 200 or 400A config is better suited.
How do I couple it to a load?
In its intended use, you bolt a prop spinner to the rotating can of the motor directly. This motor has a mounting face (stationary) and tailshaft which is useful for mounting sprockets/belt pulleys, etc. It's 12mm and smooth, so optimally you'd bore out your pulley/sprocket and fasten via pin or large-set-screw-with-flat.
How would I mount Hall sensors onto it if I wanted to use sensored commutation?
The motor does not come with sensors or encoders, etc. since it's designed to be used essentially as a synchronous AC motor in an aircraft application. You will need to strategically place 3 Hall Effect digital latch sensors to use it with a sensored controller. One good place to look and ask is the Endless Sphere forums (
http://endless-sphere.com/forums/) , where many people chop R/C model parts into ground applications
Alternatively, we also made (3d printed) a sensor PCB mount for this motor, and also had several Hall sensor carrier boards made. There are a few of these boards left too and the mount can be 3DP'd on demand. Here's a picture:
If you get a motor I'll print off a sensor ring and pitch in a pre-assembled Hall board (add your own 5 pin cable though) for $20. These get sandwiched between the motor's conical face and its mounting plate and is adjustable 120 electrical degrees to let you find your motor's best timing.