This D2822/17 Brushless Outrunner is what we use in all Battle Robot Kits that have a weapon. Its size and power make it ideal for antweight robot weapons.

Specifications:
KV: 1100 rpm/V
Max Voltage: 7.2V-11.1V  (2S-3S)
Max Watts: 102W
Max Current: 9.9A
Max Resistance: 0.192Ω

Weight: 41g (1.44oz)
Motor Diameter: 28mm (1.10in)
Motor Length: 21.35mm (0.84in).  25.66mm (1.01in) to end of hub extension.
Wire Length: 56mm (2.2in)
Plug Type: 3mm female bullet connectors
Shaft Diameter: 3.175mm or 4mm
Shaft Length: 10mm (0.39in)

Mounting Holes: Two M3.0 spaced 16mm (0.63in), two M3.0 spaced 19mm (0.75in), 90degrees offset. Four M3.0 x 12mm Phillips screws included to mount to motor.
 
Note: If you get the 4mm shaft motor and want to mount it to our carbon fiber motor mount you will need to drill out the 8mm hole so the snap ring on the motor doesn't rub.