What state are you in?

A little bit of a late reply, but I'm in Delaware. At first I was surprised by it, since they aren't exactly common in the area. Then the overreaction started. The media seemed to be hoping to find someone hurt or killed or some building damage so that this could be more of ...

My first earthquake too.

I didn't really have a chance to be scared by it, it was over just after I realized what it was.

The captive piston may be considered wadding, but I don't see anything specifically banning them.

A while ago I had an idea to win at least the trebuchet class. As far as I know trebuchet simply means its energy is stored in the form of gravitational potential energy. Dropping the counterweight ...

Well maybe you could get away with it then. I guess I'm only familiar with the fragmenting-flying-out-the-barrel sort of burst disk.

I suppose a pre-scored disk would be allowable.

It explains why burst disks aren't used, they're against the rules.

I couldn't find any reference to burst disks, care to elaborate?

1. All pumpkins fired must remain intact until they impact the ground to obtain an official measurement.
2. No part of the machine shall cross the firing line ...

You might find this link interesting

http://www.punkinchunkin.com/docs/punki ... lesv10.pdf

It explains why burst disks aren't used, they're against the rules.

The world championship is held every year about an hour from my house. I really should go sometime.

I'm just going by the diagram, but it looks like the plunger on the rear of the piston blocks the port to the pilot valve. The trapped air is compressed and acts as the bumper. Do I have the right idea Velocity3x?

To be honest, building an AEG from scratch isn't exactly going to be easy. I've worked on several factory made AEG's and there's a lot more going on the gearbox than it looks like. If it's going to be "ghetto" an AEG is not the design for you.

If you want an airsoft gun, why not try a BBMG? Similar ...

With a correct mix there should be little, if any propane or oxygen left in the chamber. Both are used up in a combustion reaction to make carbon dioxide, water, and heat.

To answer your question, yes it is necessary to vent the chamber between shots to get fresh oxygen into the chamber.

Cowscankill, what are you using for your pilot valve? It sounds like your problem is that air can flow past your piston faster than it can flow out the pilot. A tighter fitting piston would fix this, but it might be easier to just use a larger pilot valve.

My first piston valve used a 2in. piston ...

I haven't been out skirmishing in a while, but my load out previously was a TM AUG, an extra mid cap, and terrain appropriate hunting camouflage.

I've since added several more mags, an H-BAR barrel set, and some flecktarn camo.

After building the APG-2, I'm starting to rethink carrying around so ...

jhalek90 wrote:what are you using for a barrel?

place this setup as close to the muzzle end of the barrel as you can.
(someone correct me if I'm wrong there.)

I think you're wrong there. Every airsoft gun I've seen has the hop-up attached to the rear of the barrel, as close to the breech as possible.

I just tried this out. It took less than an hour to put together from junk in the garage. Cheap, quick and fun. The bottles don't go particularly high, but who really cares? It's practically free.

so just making sure but...
The barrel is 2", the sprinkler valve is 3/4" and the chamber is 2 inch. what size for around the sprinkler valve?
externally, can you say from left to right in your picture what each pvc part/size?


Sure, from left to right is a cut down 3" to 2" bell reducer, which is ...

Updated with video. Short, and boring video, but shooting video nonetheless.

http://youtu.be/OdPuJdVmGIk