connections with the hot glue as you suggested and it solved the arching

problem. Upon completion of the launcher I called my son and together we

tested it. It's a cannon! Hell of a bang! Awesome, simply awesome. It felt

great to build and then have it perform better than expected. Thanks for all

of your help and great products. The ignitor works perfectly. I built a

breech loader equiped with a quick coupler. The combustion chamber is 4" x

24", and the barrel is 2" x 5' long. I am currently using propane gas in a 1

pound bottled mounted on the chamber. The metering devise is a piece of 3/8"

pipe with 2 ball valves with a small air regulator. The whole launcher is

schedul 40 PVC. It is equiped with a 12 volt dc fan for mixing the fuel and

air. The ignitor is triggered by a momentary switch powered by a 9 volt

battery. This is the fourth launcher I've built and it just happens to be

the best one yet. After seeing and firing the launcher with my boys, I now

must build 3 more, one at at time of course. Will send a pic of the "Cannon"

this weekend.

Thanks again for all your assistance…sal