A Quick Question to do with barrel length.

[Thursto]

Well i just got a quick queston and im looking for a quick answer before i head down to my local hardware store. Im building a cannon mainly out of spare parts, all i needa buy is 2 3/4" Elbows,it will be a ball valve witch will be 3/4" also. The chamber is 2" approx 25cm long and the barrel will be 40mm, im looking to keep the gun small and portable, so what would be the ideal barrel length? my plan was not to exceed 60cm, it will be an under over design.

Here is a Quick paint drawing.

[hi]

looks fine to me. i would go for about 40 inches, but thats just me. (im not exactly sure of the conversion of cm to inches, but thats reasonably close isnt it?)

[Thursto]

Well 12 inhes is 30cm right? or close enough so that would make it like around 1m?

Im thinking of around 60-80cm max

[SpudUke5]

Yes your are correct.

Id just say as big as you can go with the portability.

[jackssmirkingrevenge]

I'd just say as big as you can go with the portability.

Agreed, but why a ball valve?

[Thursto]

I'd just say as big as you can go with the portability.

Agreed, but why a ball valve?

1. Because it is cheap and easy (no modding sprinkler valve)
2. Piston is out of the equation
3. Because i had it spare

this gun is going to be mainly a spare parts cannon
its all done, just waiting for glue to dry and adding some minor mods and accesories etc. The barrel will be 50cm long and i hae a 1m barrel to.

Later on i am planing on making it like a double barrel shotgun, (i no performence will be poor, and the air wont split properlyt etc)

Thanks for all the hep, Thursto.

[Carlman]

...all i needa buy is 2 3/4" Elbows and a ball valve...

3. Because i had it spare

ermm is it just me or...

[Thursto]

ahh i found iit in the shed like 5 mins after i posted that, sorry ill edit it out in a min. Thanks for pointing that out.

[Carlman]

lol anytime mate