As a matter of fact, I welded a steel grid across the mouth so no one could accuse me of doing just that. I figure the noise alone would cause enough problems...

Regarding the mixing of the gasses, I wanted to keep the gasses separated until they were in the chamber. Believe me, they get mixed well enough. This thing is as loud as an artillery piece as it is. Besides the stainless steel tubing and Swagelok fittings look cool. The cannon looks as ominous as i...

What kind of power is available on your cannon? Is it hand held or mounted? I designed a multi-spark high voltage ignition system that uses a pulse generator, IGBT and an automotive coil. Generates 3 rapid 50KV sparks on an automotive spark plug. Never fails. But you have to be able to assemble some...

The application was simply to create a loud party favor to celebrate the 4th. I wasn't trying to sound snippy. I just nhit send before I was finished... twice

I will take some pictures to post tomorrow if time permits.

Also,a decibel is a logarithmic function of a pressure ratio that relates to the human hearing curve. It can ve expressed in either peak or RMS.

Oh yeah, the university need a large, loud, repeatable point noise source in support of an acousitcs program.

A microphone is a pressure transducer. The one I used is an Endevco high intensity microphone designed for such use. The data is sampled at 100KSPS and has an analog butterworth filter on the front end to eliminate ailiasing. The pressure range of the microphone is good to 190dB. I calibrated the sy...

I tried to attach a BMP, EPS, and WMF pic but all were rejected. How do you post a pic?

I thought you guys might be interested in this: Some time back I designed and built an Oxygen/Propane powered cannon for the 4th of July. It does not fire projectiles. However the sound itself is devastating enough. The barrel was made from a 330 cu ft 6000 PSI nitrogen tank with the bpttom cut off....