Coaxial With Blowforward Idea

[thedeathofall]

So following up on this thread http://www.spudfiles.com/forums/golf-ba ... 18474.html

As simple and easy as the breech would be to build, (and I will still build it eventually) I really dislike the look and feel of over-under guns. Coaxial cannons are as easy to build, (or easier) and look way better.

The problem I had was how to add a BFB to a coaxial without wasting a bunch of barrel space... (this has probably been shown before, but not in a while)

This was my answer.



By placing the blowforward part inside the chamber and the mag outside, we waste very little barrel and still get the desired effect.



Comments??

[SEAKING9006]

I like it. It looks like you took a few design elements from the X-ACS after all. =)

The only thing that bothers me (and it bothers me for all big bore repeaters) is whether or not you will be able to get enough flow into the chamber fast enough to have a decent ROF. That was the reason behind the second chamber on the X-ACS. That's assuming that the magazine solution doesn't give you any greif, but a simple stick (albeit ugly) should suffice.



By the way, don't know if you noticed or not but the Mc Master part number of that spring I was talking about earlier is on the X-ACS thread.

[MountainousDew]

You would really rather hold a 3 to 4 inch diameter gun than an over/under.

This design should work as long as everything is sealed, but now there is no way to service the bolt if something broke.

[thedeathofall]

The only thing that bothers me (and it bothers me for all big bore repeaters) is whether or not you will be able to get enough flow into the chamber fast enough to have a decent ROF.

Yes, that is the biggest problem. Maybe with multiple air inlets?

Oh and thanks for the tip, I will have a look at the thread again.

(HAHA!! I found the part and guess what? It was the exact same one I was looking at myself )

You would really rather hold a 3 to 4 inch diameter gun than an over/under.

Actually, If I would do this, I would probably make the chamber 6 inch pipe. It will be more expensive, but I can make the cannon shorter and still give enough chamber volume.

Also, if I were to make a large bore repeater, I wouldn't hold it at all. I would make a stand for it.

This design should work as long as everything is sealed, but now there is no way to service the bolt if something broke.

This was addressed on the other thread. The whole point of this is so that it is cheap and easy to make. You can make the whole breach part for around $15 USD (including spring). This means that multiple parts can be bought in case something doesn't work or you mess up.

[jrrdw]

This design should work as long as everything is sealed, but now there is no way to service the bolt if something broke.

Why can't you use a sealed plug like on other cannons? Just because it's a co-axle shouldn't make a difference.

[thedeathofall]

Why can't you use a sealed plug like on other cannons?

I dont' think I follow... What do you mean sealed plug? Like a plug(or bushing) with o-rings and uses screws to hold it in place?

[jrrdw]

Like a plug(or bushing) with o-rings and uses screws to hold it in place?

exactly.