maverik94 wrote:Isn't that what every airgunner secretly desires? To get ice burns on their arm from flying air cartridges?
It's not universal though, for example 100% of all Polish spudgunners I've spoken to think it's a childish waste of time
are those cartridges cold when they're spent?
I don't know at what temperature it ejects but by the time I friggin' find it it's at room temperature
Tech wrote:I like your basic layout of the autoloader. Under close examination, it will need a change in the trigger/air source.
With just a blow gun, when the shot is fired, and the plunger pushes back, if the air is still on, the pressure will lower the column of rounds preventing feeding.
Not necessarily, first of all having the magazine tube say 1/8" wider than the projectiles will prevent this effect because the pressure in the tube will equalise.
Also, if you don't use "just a blowgun", you would be negating the whole advantage of using the valveless/pop-off principle, which is basically getting performance better than a piston valve using only a rudimentary trigger valve.
The theory is that you open the blowgun and the pressure builds up, sealing the projectile in the breech against the seal and pusing the bolt back. Bolt spring compression should be set so that the projectile pops around the time the bolt passes over the magazine.
Once the bolt is past the magazine, a new projectile rises into the breech while the bolt continues to travel back by its own momentum. The bolt then stops and reverses, pushing the new projectile into the seal.
The trick is to balance bolt weight/spring compression to allow the above cycle to happen, once that is achieved I see no reason why it shouldn't work as described.
I may see if I can add a golfball magazine to a QDV cannon to auto load golf balls from a magazine this way. It is a good basic design. Thanks.
I would really like to see someone do this in a larger calibre, with the construction techniques you've applied to spudguns it should be very achievable - just make sure you build in "tweakability" in the bolt setup, you'll need it!
As to the subject of this thread, I'm going to extend the bolt tube in order to fit a compression spring, so instead of the wire stop I can allow the bolt to travel further back allowing enough time to feed another round, watch this space