I need a 3-4oz tank for my Cleveland class build and a 5oz tank for my Baden class but most of what I'm seeing is soda stream or similar. Also whats the on the pond experience with aluminum vs steel, I figure its a save weight but gain corrosion issues with aluminum?
The small bottles you can get from BC, although it may take a while. Alternatively, a 3000PSI HPA bottle is physically identical to a standard CO2 bottle. Same construction, pressure ratings, everything. I have a few bottles that actually have on the label "13 cu.in." for HPA and "5oz" for CO2. The only real difference is whether you put a CO2 type valve on, or if you put a HPA-style regulator/valve setup on. The same is true for "spare air" compact air cylinders for diving - these are also commonly used by paintballers who just put a HPA valve on. As far as aluminum vs steel.... aluminum is more corrosion-resistant than steel. It is not as strong though, so it takes up more space for a given amount of CO2. None of your ships are particularly sensitive on space, so get yourself a few 5's and call it a day. The extra gas just means your cruiser will be more leak-resistant.
I did not know this was a thing. Looking at some ebay listings, the 0.25l size appears to be approximately the same length as my 5 oz bottle (18cm), but is 1cm larger diameter, so 2.33" vs 2". I'm not sure about the output threads, because I relied on Tim to source valves etc, and Smart Parts is long gone, sadly.
South Jersey Shipyards has some 5oz bottles without valves. Other than that... just gotta look around, the small bottles are very hard to find right now.
If one was to change the non-valve tank to a valved tank, what would you use to change this our or screw onto the non-valve tank to make it usable?
The valve can be removed and replaced with a needle valve. Make sure tank is empty, then generally can unscrew when putting tank in a vice or using strap wrench with an assistant. When installing, torque to spec. I also use red locktite for extra measure
That isn't an issue, the seal in the valve is shot and I need to replace it. Probably check Amazon. No paintball shops around here. Thanks much!