Mistr-MADness

You could probably sell it for $20/$25 on EBay, more if it's a Transformers Barricade.

I do not know about the rest of this, but:

 

MTB Rhinos spin at 36,000 RPM. Glass ceiling is considered ~23,000 RPM, and you need the headspace for loaded speed vs. the no-load the motors are rated at.

Whoops! Meant to say those spin a tad slow.

I really wouldn't use those. Look pretty cheap, guessing they're seriously lacking in torque. 27,000/30,000 RPM is too fast for a flywheel motor anyway.

The Nerf Wiki says it retailed for $25 - http://nerf.wikia.com/wiki/Crossbow

1. I don't know much about brushless motors, but they are infinitely more complex and require ecs and other fancy electronics to work. They are also a different shape and lots more torque so cages are custom made for them.

You can run brushless motors in normal SSS cages. Torukmakto's T17 uses two brushless motors in an AR cage: http://torukmakto4.b...-continued.html.

2. Flywheels don't matter as much as the cage, motors and battery. Holligan wheels, worker plastic, and artifact plastic work best.

Your flywheels matter a way more than the cage you use. Two balanced flywheels are the key to improving vibration and precision in your build.