Where'd you get the tube at? Do they have big sizes also?

Right. :roll: I'm sure you're some sort of studied psychologist with years of on-hands research to proclaim such a disposition.

My friend had the cops show up while he was shooting his golfball cannon . After showing them that and their many AR-15's, their apparent reference to him and his ...

I have specs for a 6" chamber and 3" barrel. I can get away with a 4" chamber but it's almost as long as the barrel, I want to use a 6" chamber instead. Does anyone here know a cheap source of 6" reducer fittings? Grainger has them but they're about $18 a piece.

Cops aren't your friends. If they can charge you with breathing wrong then they will.

Keep a copy of the ATF's "Orange book" with you so you can show them how stupid they really are.

Alright, as far as I know everyone using metered propane has always regulated it but my idea was to design a cannon you don't even need to really meter by getting the amount of fuel needed in the chamber near even with the pressure of comes directly out of a propane bottle when the needle valve ...

combustion:illegal max $4000 fine,even with gun licence they are illegal, no matter what.
Pneumatic:are classed as air rifles,need to be 16 with a gun licence,or 18 and over and then its legal,or you have to be under the direct supervison of a person older then 18.you can't use them to damage or ...

I figured as much. I've seen people do it differently but then they didn't show their cannons actually working, quite possibly because they didn't. LOL.

When the courts are stacked full of leftists then that is the quality of opinion they will rule with. Just because a court rules on something doesn't mean it's correct. Look how many cases have been overturned by other/higher courts.

If they had their absolute way you wouldn't be allowed a spud ...

From what I understand I would want the fan at the rear of my chamber then have the igniter somewhere in front of it, maybe right in the middle of the chamber?

Does it matter?

You should've been buying up stuff long ago.
Australia that is your fault for putting up with it in the first place.
They came for your guns and you handed them right over. Live and learn.

New AWB is uncontitutional and won't stand. There will be a civil war over it if they pass it.

To the OP, if ...

Man, thanks for the help. I'm retarded. Seriously.

Alright so bsically I'll just measure the volume of the meter I make then I will plug that into the equation and find my ABR. How did you convert BAR to PSI?

My idea was originally to launch 70mm cans of food but now I'm wondering if the combustion exhaust is hot enough to ignite a fuse? I imagine it would be but I know propane doesn't burna s hot as allot of other things but surely it would ignite nitrocellulose laquer cannon fuse.

The issue I may ...

Good to hear.

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That should read "most fuel efficient ratio".

I saw a ballistic graph where they measured the muzzle velocity of a spud and all indications were that the .6-.8 to 1 ratio yielded that highest veolicty in FPS. Allot of it was marginal but that window there was allot better than the readings they ...

Thanks for the info. Then for my 18" chamber I need 155.1557mL by the math.

My question is about metering: How do I know what PSI will release that much volume of gas in mL into the chamber? I'm metering propane with a regulator and I need to know what kind of regulator to get because some let you ...