Gun pneumatics

I was pondering about how I would power the 2 fast gun cannons in a small vessel the size of the Indiana Clas predread, does anyone have any ideas how I could power them?

 

3.5 ounce paintball tank perhaps? It is what I use in the French Verite PDN.

 

Thats offly large, but the capacity is something I do like though, and the verite is bigger and is more like a cruiser in size compared to the Indiana Class that is closer to a destroyer.

 

Well actually its more of a Cleveland class vs a Baltimore class in displacement figures.

 

You should still have enough displacement. Not only does my Verite have one more cannon than you are contemplating for the Indiana, I had to add a pound of weight to the ship to reach it's allowed max weight of 13 pounds ... and even then the ship floats high. Heh. If you go with a lightweight LiFE battery such as the Headway 10ah cells (1.5 pounds for battery pack) and a lightweight regulator, I'm confident that there is enough weight left for a 3.5 bottle.

 

Would an 88 gram canister work?
http://www.pyramydair.com/s/a/Air_Venturi_pre_filled_disposable_88_gram_CO2_tank/286
http://www.rap4.com/store/paintball/3oz-88g-disposable-co2-cylinder

 

Imagine so.

I just do not like the idea of non-refillable cartridges ... it may get expensive after a while.

 

Is that a 3.5 ounce co2 tank small enough that a hydro is not required?

 

The 88 gram cartridges are really heavy and long and expensive for their capacity. I don't remember exactly how much they weigh but I do remember rejecting them after i bought a couple at wallyworld for those reasons. 56 gram capsules are a better fit for two guns, ask Mike Butts where he found them but beware because they are old surplus and we had problems finding them in the late 1990s when the Internet was newer.
Ron Hunt

 

What is a hydro?

 

Like my 4 20oz Co2 tanks needed hydro and they are still sitting waiting to be tested and I think we threw one away cause it had a bent valve

 

Didn't the rules change that eliminated the need for scheduled hydrostatic testing of CO2 tanks? It is still a requirement for high pressure air (HPA) tanks, but I do believe CO2 gets a pass now.

 

Ah. Just found and read the rules on testing in 49CFR part 180.205. Basically, if the bottle is 2" or less diameter and 2' or less in length, then hydrostatic testing is not required. That would account for the 20 ounce tanks requiring it and the smaller 3.5 and 7 ozs not.

 

My two 9oz tanks also require hydro, and whats the basic setup from tank to the guns on a 3.5oz bottle gun set up?

 

Thank you, that helped allot because I wasn't sure how the order went.

 

On strike and battlers cannons there is an airline that feeds to the back of the mags, does that mean that gravity flow of ammo is unnecessary seeing as the gas should push the bbs to the guns?

 

That line ensures that bbs are not blown back from the interrupter to the feed end of the magazine. It makes sure that a bb is loaded in the interrupter every shot. On some cannons, that line also feeds extra air to the breech through the magazine.