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Put the barrel inside the combustion chamber!
Posted: Fri Jul 18, 2008 12:36 pm
by magnum9987
I was thinking about making my guns compact, like a rocket launcher. So i thought "Couldnt you put the barrel inside the combustion chamber, to shorten the total length?" This would make it ideal for airsoft/ combat use. It may also allow for breech loading, as the cap of the combustion chamber would also hold the round in. Steel Wool would still allow the combustion to go off (Someone also gave me the idea of titanium or iridium wires). So a combat spuddy design could benefit for this.
(Do not remind me that I still cannt build a spudgun, I'm just discussing this design.)
Posted: Fri Jul 18, 2008 12:42 pm
by brogdenlaxmiddie
yeah... Welcome to the ideas of coaxials.
Posted: Fri Jul 18, 2008 12:45 pm
by magnum9987
thats what they are? DAMMN!
Posted: Fri Jul 18, 2008 12:45 pm
by Sticky_Tape
I am positive it was done by spuddin.
Posted: Fri Jul 18, 2008 12:47 pm
by Pilgrimman
What you've described is a co-axial design. Be warned that it is hard to get these to work as combustions, especially if you intend to make it spray & pray. As for Iridium wires, be ready to shell out the $, as Iridium is fairly rare.
Posted: Fri Jul 18, 2008 12:47 pm
by magnum9987
dont have to rub it in my face! god!
Posted: Fri Jul 18, 2008 12:58 pm
by brogdenlaxmiddie
Plus, why would you want to spend the extra money on something not needed? Especially on wiring???
Posted: Fri Jul 18, 2008 1:58 pm
by sirspuddest
brogdenlaxmiddie wrote:Plus, why would you want to spend the extra money on something not needed?
That's spud gunning for ya.
Posted: Fri Jul 18, 2008 6:30 pm
by MrCrowley
Someone made a telescopic combustion once, I think it was sgort87 I can't remember.
Posted: Sat Jul 19, 2008 12:08 am
by frankrede
MrCrowley wrote:Someone made a telescopic combustion once, I think it was sgort97 I can't remember.
IIRC it was, it also helt the fuel and some balls in the cannon too.
Posted: Sat Jul 19, 2008 12:57 am
by starman
Why all the esoteric ignition materials? Why not just go with a BBQ ignitor and 1/4" spark gap?
A coaxial combustion is possible, just a little more build difficulty. The only advantage is you can hide some length of your barrel. Keep in mind you'll also be stealing combustion chamber volume.
Just some things to theorize over...
Posted: Sat Jul 19, 2008 2:28 am
by SpudFarm
hmm scottrete did that also didn't he?
Posted: Sat Jul 19, 2008 11:27 am
by DYI
Just remember that a lot of the power in propane combustion lies in the heat it generates (the molar increase isn't very significant, 1:1.2). By putting the barrel inside the combustion chamber, you have more surface area for a given chamber volume, and therefore more heat loss. Heat loss is not your friend in this case, and this is why coaxial combustions are uncommon.