Look closer. It says 16 [POINT] 32, not 16 [COLON] 32.
So 16.32 motor revolutions per sector revolution. The per gear ratio would be different.
From the AirsoftMechanics article I linked:
"Bevel to Motor Pinion Ratio: 30:10 = 3:1
Spur to Bevel Ratio: 39:10 = 3.9:1
Sector to Spur Ratio: = 32:20 = 1.6:1
Final Ratio = 3 x 3.9 x 1.6 = 18.72"
All that to say, 16.32 motor revolutions per completed firing cycle. Now this seems very predictable and straightforward, but in real life it gets messy. See, most motors don't have good information out there as to their unladen RPMs, let alone graphing of their RPMs at different loads. So even were I to know for a fact that my G&P M160 is rated at--I'm using made up numbers, I can't actually find RPM data on the M160s--25,000 RPMs and my gearset is a 18:1 ratio, that doesn't mean I'm going to get 23 RPS. See, the production motor I'm holding in my hands probably isn't spinning at exactly the rated 25,000 RPMs, and I can't know how big the discrepancy is. My wiring/trigger/battery combo may have too little amperage and voltage and too much resistance to give full power to the motor. And even were those not true, the more load the system has--both from the spring, the weight of the piston assembly, and even the friction in the gearbox including the rails and the bushings/bearings--the slower it goes. So I can't know exactly what my ROF will be.
However, I can do something useful. Assuming my gun isn't overstressed (for instance, with a G&P M160 or a Systema Magnum or another high torque/high speed motor I don't have to worry about a M110 or M120 spring being too stiff for a HS gearset), I can use the ratios to compare how much of a gain or loss I'll get by changing gearsets. If I'm getting 21 RPS in an 18.72:1 ratio Systema genuine gearset....
(21*60) = RPMs/18.72, RPMs = (1260)18.72 = approx 23,587.2 effective RPMs. So if I go to a Systema high speed gearset at 16.46, I can expect RPS in the ballpark range of 23587.2/16.46 = 1433 RPM = 23.8/24 RPS range. A Systema Super High Speed at 15.5 would net me around 25.36 RPS...and so on.
That help, or did I just ramble on for no reason?
Kids, do your Algebra!
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