SpudFiles

shield personal defense,you should do a multiple spark gaps, its awesome!!!

Well it definitely sounds like your mixes are off. Either you're not venting the chamber properly, the fuel isn't get mixed properly or you've done the calculations wrong. I'm almost certain it's one of those three problems.

I used the spud tool from ultimate spudgun and By the calculations, the meter is way too big and there is no ignition of propane. I will try adding a chamber fan and see if that helps.

care to share your dimensions (meter, chamber etc.) and fill pressures?

11" 3" sch 40 chamber, Approximately 50" 1-1/2" sch 40 barrel minus the air ram.

air ram?

What's your meter volume and what pressure do you fill it to?

You know, with that volume you can simply use a 50mL syringe...

http://www.spudfiles.com/forums/how-to- ... 22301.html

8tonsemi wrote:for 10-20 bucks get a stungun! =)

Stun guns aren't legal in alot of places.

And a stun gun won't help performance at all (especially since the gun is igniting with the sparker).

To tell if a fan will help, without actually installing a fan, just load ammo, fuel, then let the gun sit for ten minutes or so. Assuming your ammo is air tight (like a spud generally is) then the long wait will insure that the fuel and air are fully mixed. If the performance goes up with the long wait then you need a fan. If the performance doesn't improve then your mixture is wrong.

I have an air ram on it to simulate the recoil of a field gun. Its hard to describe. Look at this : http://www.spudfiles.com/forums/ways-to ... rt,15.html
It pushes the whole barrel and chamber backwards upon firing on a set of tracks with elastic bands to return it to original pre-fired position.
I am not sure, but my cannon is the first one I have seen with an airram on it, but it works great.........if I can get a good combustion.

Recoiled_monsteR wrote:I have an air ram on it to simulate the recoil of a field gun. Its hard to describe. Look at this : http://www.spudfiles.com/forums/ways-to ... rt,15.html
It pushes the whole barrel and chamber backwards upon firing on a set of tracks with elastic bands to return it to original pre-fired position.
I am not sure, but my cannon is the first one I have seen with an airram on it, but it works great.........if I can get a good combustion.

So you use the combustion gases to help recoil the system? Perhaps you should upload some pictures or a diagram.

A medium combustion on a low friction rail firing a reasonably heavy projectile shouldn't need boost to recoil nicely...

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This is exactly what I did in a nut shell

Looks to me like that setup would (1) make the recoil worse, (2) waste energy in making the gun recoil and (3) not return the gun to the starting position after firing.

jimmy101 wrote:Looks to me like that setup would (1) make the recoil worse, (2) waste energy in making the gun recoil and (3) not return the gun to the starting position after firing.

I think he wants to boost recoil for an artillery effect.

Still, I'm confused, that looks like a ball valve pneumatic but we're talking about a combustion

What is the thing in the middle between the chamber and barrel?