OMR-4043-165

This can rotate 22-inch sized propeller which you cannot use with the former model OMR-4043-172ll 
by changing the gear ratio from 6.73: 1 to 7.03: 1. 
Also, this has achieved more stable and constant speed of flight.
You can use 21-inch-sized propeller as well.
Like the former model, the first belt is 9mm and the second belt is 11 mm. 
The structure of anti-vibration rubber remains the same and it makes the sound mild.

Specifications
Outer diameter: W60xH90mm
Length (Main body only): 137mm
Number of poles:4 poles
Shaft length:45mm
Weight: 632g
Applicable battery: 10 cell lipo battery
Applicable ESC: O.S. (OCA-1100HV)

Including a reduction unit and a motor.

You can also purchase them separately