Heimo wrote:I bet that this would work nicely to make a hybrid cartridge that will take high mixes
Not if you wanted the cartridge ejecting, it would knock out anyone standing next to you...
... or discover the joys of epoxy adhesive
I made a cartridge and a barrel/breech, it will need another 24 hours to cure though as it's bloody cold and it's too big to fit in the oven. I'm very confident it will blow back succesfully, I've learnt a lot since I last gave this idea a go. With a 40mm O/D cartridge there's almost 2lbs of force on it for every 1 psi so it should have more than enough energy to push back a bolt spring and overcome the friction of the other cartridges from the magazine.
I'm also using thinner walled PVC tubing for the body which is also shorter than my previous attempts, so the all-up weight of the cartridge should be lower.
Another worry I had with my previous attempts was that since the cartridges were coaxial, I wouldn't be able to centre the mouth of the cartridge with the breech, since I work with very basic tools. The simple solution to this was to wrap a section of barrel material with strips of tape until it reached the diameter of the cartridge body, this is a neat and simple way to get a perfectly centred cartridge every time.
The plan now is the make sure the cartridge works and blows back smoothly, then proceed with the construction of a suitable sprung bolt with ignitor contacts together with an ejection mechanism along
these conceptual lines.
