FINAL CONTEST - WINNERS!

[sandman]

if this was the next task for the next competition, then i would enter if i could get the funds in time

[joannaardway]

I find a lot of these dilemmas can be sorted out by taking a look at the modern combustion engine. Have you considered water cooling? A thin reservoir around the chamber, connected to a pump and then a coiling of 1/4" copper tubing in front of a fan, should be able to do the job. Keep in mind that it'd still get pretty hot, though. 8)

I have considered water cooling - it has some problems, so I'm wondering if anything else could do better though.

[sandman]

well, i just made this up um what about using compresses air aroung the barrel and with every shot let some out so it will cool down

P1V1=P2V2

[mark.f]

I believe you mean P₁/T₁ = P₂/T₂ ?

Probably would need a very high pressure to make this work. You could make a pressure-rated enclosure around the gun on the "low" side of a freon pump to use the same basic principle, with higher efficiency.

EDIT: what's with my damn formatting today?!?!?

[sandman]

lol, yep i did, i just forgot the half that you posted,(the part i needed).

[clide]

Air cooling would probably be most simple and still be fairly effective. Just have some fins coming out radially from the chamber and a fan to blow across them. You could have some type of heat insulator around the outside of the fins so you can hold onto it.