I've designed a spreadsheet for use with homemade launchers. Most launchers use one of three forms of supplying air to the chamber; 12g cartridges, portable CO2 tanks, and HPA tanks.

For 12g cartridges, the calculator provides the amount of pressure that will be provided to the chamber for one cartridge. It will also determine the approximate volume needed for the chamber to have a certain pressure.

For portable CO2 tanks, the calculator provides how many fills a certain launcher can expect from a full tank.

The compressed air tank calculator does the same as the CO2 tank calculator, doing it for compressed air instead.

I've also provided a conversion calculator (since all of the units used within the calculators are English). The conversion calculator provides many of the most commonly used units and can be used beyond this calculator for easy conversion.

The last is a pipe information calculator. It provides the ID, OD, rated pressure, and volume for many of the most commonly used pipes that are used within a launcher, inlcuding PVC (Sch40, Sch80, Sch120, SDR), CPVC, iron pipe, and copper (types K, L, and M).

I hope that this calculator can find some usage for you guys. Please inform me if there are any problems or errors noted so that I can get it fixed.

Hubb.

Portable Tank Calculator

Original document contains errors. Document has been upgraded.