01 // Gear Ratio
Lower Ratios Increase Speed
A 13:1 gearset generally cycles faster than an 18:1 or 32:1 gearset, but it can place greater demand on the motor and electrical system.
CQC Technical Systems
Gear Ratio & ROF Calculator
Estimate your AEG rate of fire using motor speed, battery voltage, gear ratio and drivetrain efficiency.
Build Configuration
RPM
Use the motor manufacturer’s approximate unloaded RPM rating.
V
:1
Teeth
Lower values can represent short-stroked sector gears.
Teeth
Accounts for spring load, friction, motor slowdown, wiring, battery sag and gearbox resistance.
Estimated Performance
Estimated Rate of Fire
22.5
rounds per second
Rounds Per Minute
1,350
RPM
Loaded Motor Speed
21,600
RPM
Sector Gear Speed
1,350
RPM
Cycle Time
44.4
ms
Effective Gear Ratio
16.00
:1
Shots Per Second
22.5
RPS
02 // Motor Load
Rated RPM Is Not Loaded RPM
Motor RPM ratings are usually measured with little or no load. Spring strength, shimming, friction and battery sag reduce actual speed.
03 // Build Safety
High ROF Requires Supporting Parts
High-speed builds may require proper angle of engagement, stronger piston components, active braking, short stroking and professional tuning.
This calculator provides a theoretical estimate only. Actual rate of fire depends on battery condition, motor characteristics, spring load, air-seal resistance, gear quality, shimming, lubrication, wiring, MOSFET settings, piston weight and other mechanical factors.
Found your target ROF? Plan the parts to match.
Browse AEG gears, motors and MOSFETs for your next build. Need help checking compatibility? Send us your rifle model, current setup, target rate of fire and budget before ordering.
Calculator results are estimates, not a compatibility guarantee. Gmail may require sign-in. You can also email Sales@cqcairsoft.com.