Long barrels are associated with long range accuracy because a long barrel usually means high velocity and this results in a flatter trajectory. The projectile gets to the target quicker and therefore has less time to be affected by gravity, wind and other environmental factors which have to be compensated for.
Very true. I neglected to mention that because my simulation will keep muzzle velocity constant. It'd be worth noting for others less scientific than myself though.
The other side of the coin however is that with a longer barrel, there's more time in between you pulling the trigger and the projectile leaving the muzzle, so any movement during that time is more likely to have a negative effect on your accuracy.
Good point. This is another reason to use shorter barrels, especially given that the time in barrel is actually reduced more than the barrel length would suggest (keeping muzzle velocity constant) because of other factors (the higher pressure with shorter barrel lengths primarily).
Have you looked into the Mauser Zig-Zag Style of revolvers? It's the same design that Solar's Eclipse uses if I remember correctly.
The system would be reasonably easy to implement. All you would need is an air cylinder with some sort of pawl to ride the zig-zag grooves on the revolving barrel assembly.
That is the plan at the moment, but I was also considering some similar mechanisms seen in other Nerf guns that are simpler.
Below are some close-ups and descriptions of the pieces made. Sorry if the contrast seems a little high--I screw around with the curves too much.
You couldn't tell at all what this piece was in the original photo. It's meant to be attached to the air reservoir and allow the trigger/valve assembly to be held in place (the holes are for screws). Originally I wanted to wrap a big piece of plastic around the air reservoir... but that would have been expensive so I switched to velcro, which actually is a much better idea.
These pieces basically attach the rotating barrel assembly (commonly called a "turret" in the Nerf world) to the valve and a polycarbonate structure that I have not made yet. The turret piece will be held in with a spring and bolt that are not shown. A thrust bearing will prevent unthreading of the bolt.
The left piece is a stabilizer for the turret. The right piece is simply a trigger.
All spud gun related projects are currently on hold.