Re: bigger bang?

On Jul 12, 3:40 pm, "Lloyd E. Sponenburgh" <lloy...@xxxxxxxxxxxxxx>
wrote:
"SteveB" <oldf...@xxxxxxxxxxxxxx> wrote in message

news:tjvli.481400$g24.37175@xxxxxxxxxxxxxxx







As we speak, I am working on two devices. One is a gopher killing device
that uses 5% propane and 95% pure oxygen underground to make a concussion
to kill the gophers.

And while I am at it, I have decided to make a noisemaker that will give
my peaceful valley a good bang next Fourth of July. I am thinking about a
8' length of 8" schedule 40 pipe with the bottom capped. The top would be
open, and pointed up. Masking tape would close the top, save for a small
pressure relief hole punched in it and a flap of paper to keep the gases
in. It would have a remote sparker. It would have flashback arrestors on
the inflow ports.

Propane and oxygen would be forced into the pipe for a couple of minutes.
All flow lines would be removed. From a safe distance and with ear
protection in place, boom.

You needn't seal the muzzle. There are several commercial "concussion guns"
available to pyrotechnicians that use propane/oxygen and standard gas
valving to meter a charge (usually under PLC control) JUST before firing.
Some can fire as frequently as once every half-second.

LLoyd- Hide quoted text -

- Show quoted text -

The old "Big Bang" cannons used just acetylene (from calcium carbide +
water) in air, open muzzle. The large ones make a pretty good
noise.

8 feet of 8 inch pipe would be considerably larger and louder. Now,
if you reduced that 8" pipe to, say, a 3" barrel you'd have one hell
of a potato cannon....

John Martin

.

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