try using the name pressure relief valve, over exhaust valve im in the same boat, trying to track down info on an supposedly adjustable pressure relief valve. between 150 and 800 psi. boiler or steam pressure relief valves might work too, some even have a triggering device on them too. Im trying for...

Im in the process of checking all my electrical connections at the moment, coil switches cable etc, battery is new- tests fine, the only other thing I can think of is if the LPG(propane) isnt mixing right and sitting as a pocket. as for the gauges, they are not overly flash but they have worked well...

Ive had it out for a shot, and ive found that even reinforced concrete cans are disintegrated before they leave the barrel. However im having trouble firing it, Im using a long thread sparkplug and a car coil connected to 12v battery, which fires it fine when on the flat but any angle in the shot an...

Yeah the trailer is about 350+ kg and the cannon is 150kg (frame included) the wheels were chocked and I didnt take notes but I think that was a 6 power mix, It started raining too hard for the cameras for the 9 and 10 IIRC Im looking in to getting a lathed apfsds round made, maybe lol. next time is...

as you would have probably seen in the hybrid build section that I've had this build on the cards for a few years. well I got around to making it a reality. Its a 5m long 75mm bore hybrid utilising a class 150 4 bolt flange as a burst dics holder. the chamber is a 20litre ex-oxygen bottle, and has a...

There was projectiles involved- baked bean cans full of concrete. the conclusion we have some to the cloud you see is the concrete being reintegrated in to the atmosphere as a dust. we found no remains of any tins or concrete at all, that shot was on a 7X if I remember correctly. I can't wait to sor...

started off the testing with a 5X mix
I got to 10X and the compressor couldnt pump any more so im already looking in to other options for air fill to get to a higher mix

wednesday if the weather breaks, thursday regardless

So I don't know where I got the time to do it but I managed to make up a simple ignition coil system. So now all it comes down to know is fuel, compress and fire about bloody time too

merry xmas

Im just working on the temp frame at moment. Im hoping that the 10kv stock prod I have will be able to fire is on the test run as I have run out of time for the moment to sort a coil firing system out. Im hoping to get out on wed to test fire this puppy. Ive re-read thru my original post and been lo...

Ok, had half a day free, spark plug is in, gasport is in with tap and bayonet fitting, got the adjustable gas regulator and gauge, just need to sort the coil, portable compressor and the frame

definitely be giving it the miss then Knew there had to be a reason now one else is using one


It going to be trailer mounted any ways so proberly use a car battery for simplicitys sake

Im more interested in the start up "strike" voltage- im told its up around the 23kv mark then drops back to 85-150volts to maintain the light,

Just wondering if any one has used a HID Ballast instead of a coil or other as a spark generator? Looking at other options and ideas