Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 61 users online :: 4 registered, 0 hidden and 57 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Coaxial With Blowforward Idea

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Coaxial With Blowforward Idea

Unread postAuthor: thedeathofall » Thu Jun 18, 2009 11:01 am

So following up on this thread http://www.spudfiles.com/forums/golf-ball-blowforward-semi-t18474.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.

Image

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



Comments??
  • 0

Last edited by thedeathofall on Thu Jun 18, 2009 11:55 am, edited 1 time in total.
"I'm spending time without a gender for tax reasons. It's great if I get hit in the groin, but a total nightmare in the bathroom."

-Rag


Obsequium parit amicos; veritas parit odium.

-Cicero

thedeathofall
2nd Lieutenant
2nd Lieutenant
 
Posts: 213
Joined: Tue May 06, 2008 10:43 pm
Reputation: 0

Unread postAuthor: SEAKING9006 » Thu Jun 18, 2009 11:22 am

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.
  • 0

Completed projects:
CA1 SMSS Basic Inline
CA3 PDAB Airburst Cannon

Current Project: Bolt action rifle (25x140mm + 1in shot)

SEAKING9006
Colonel
Colonel
 
Posts: 734
Joined: Mon Jun 23, 2008 3:20 pm
Location: Texas
Reputation: 0

Unread postAuthor: MountainousDew » Thu Jun 18, 2009 11:28 am

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.
  • 0

<a href="http://s709.photobucket.com/albums/ww95/JKazkid/?action=view&current=MDSig.jpg" target="_blank"><img src="http://i709.photobucket.com/albums/ww95/JKazkid/MDSig.jpg" border="0" alt="Photobucket"></a>
User avatar
MountainousDew
2nd Lieutenant
2nd Lieutenant
 
Posts: 230
Joined: Tue Apr 14, 2009 6:06 pm
Reputation: 0

Unread postAuthor: thedeathofall » Thu Jun 18, 2009 12:08 pm

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 :lol: )


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. :wink:

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.
  • 0

"I'm spending time without a gender for tax reasons. It's great if I get hit in the groin, but a total nightmare in the bathroom."

-Rag


Obsequium parit amicos; veritas parit odium.

-Cicero

thedeathofall
2nd Lieutenant
2nd Lieutenant
 
Posts: 213
Joined: Tue May 06, 2008 10:43 pm
Reputation: 0

Unread postAuthor: jrrdw » Thu Jun 18, 2009 12:48 pm

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.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: thedeathofall » Thu Jun 18, 2009 1:47 pm

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?
  • 0

"I'm spending time without a gender for tax reasons. It's great if I get hit in the groin, but a total nightmare in the bathroom."

-Rag


Obsequium parit amicos; veritas parit odium.

-Cicero

thedeathofall
2nd Lieutenant
2nd Lieutenant
 
Posts: 213
Joined: Tue May 06, 2008 10:43 pm
Reputation: 0

Unread postAuthor: jrrdw » Thu Jun 18, 2009 7:16 pm

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



exactly.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Sponsored

Sponsor
 


Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'