Hmmm, 90 psi = 6 bar. 4Cfm=36L/min
A carcompressor gives us at best 42L/m at 1.1 bar, and dropping fast if any power is aquired.
Let us say 7L min when providing 6 bar, and it will get hot fast, unless you replace the cheap motor with a way better one(and then you will ruin the compressorpart itself-I know this from experience, the bearings on the crankshaft die in 30 seconds)

For example, a small commercial hobby compressor can give 6 bar 30 l/min and thats with mains.

So, Youll need a better DC powered compressor.

Now the volume of air needed-or CO2- to power this motor during a 5 minute fight is , when everything goes well, 36L*5=180L on 6 bar
Giving us 1080 L gas atmosheric. Thats a 2 kg bottle of CO2.-1 kg of liquid CO2 gives us 512L of gas, on room temperature- and the bottle will chill-so you need more CO2 to compensate.

I believe the top up with 1 car compressor wont do you any good, except draining batterypower you desperate need for drive.Even running on max flow it will provide only 42*5= 210L, when more than a 1000 is needed.

Also, if I calculate it correctly, this airmotor has the power of 36*6/500=432 watts. And thats peak rpm.

Now, can you spare the weight of a 2 kg CO2 bottle in a feather? Average weight of those is 3 kg.The lightest available,and approved 2kg CO2 bottle Ive seen is 2.7 kg.The regulator you need will set yau back for 1 kg. For 4 Kg I can build a way more nasty spinner, with more power.


There is a reason airmotors are used in the industry, and that a lot less than electrical motors.They dont compare in power or ease to use.
Why do you think there are cordless drills, and no cordless airmotors?

And to answer your last question. It would be connected like a single acting cylinder.Or even simpler with a 2/2 valve.