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 44 users online :: 4 registered, 0 hidden and 40 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

Battering ram piston design

A place to ask general spud cannon related questions.
Sponsored 

do you think this will work

Yes
0
No votes
maybe
0
No votes
No
2
100%
 
Total votes : 2
  • Author
    Message

Battering ram piston design

Unread postAuthor: pat123 » Fri May 04, 2007 9:46 am

Do you think this will work
  • 0

Attachments
piston.JPG
User avatar
pat123
Colonel
Colonel
 
Posts: 514
Joined: Sat Dec 23, 2006 10:08 pm
Location: S.C.
Reputation: 0

Unread postAuthor: Hotwired » Fri May 04, 2007 9:58 am

So you let it charge up then whack it into a door, causing the piston to slide down, squashing the propane finally tripping a switch, igniting the compressed mix and blasting the piston out again with more force.

Could work but I'm sure theres a reason why the police stick to swinging a bloody great lump of steel at your door instead.

Quieter and less dangerous p'raps.

*edit whahaha first post by seconds :D
  • 0

Last edited by Hotwired on Fri May 04, 2007 10:00 am, edited 2 times in total.
User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: goose_man » Fri May 04, 2007 9:58 am

Well, for starters, the valve would have to let air is as well, not just propane. Also, the piston would have to connect to a cam-shaft like in a car (I'm assuminig you want to make an engine-style device) in order to push down after the combustion stroke is over.
I also see a potential fuel loss problem when the piston is up because the exhaust port and the fuel valve are open at the same time.
I suggest moving the exhaust up to the very end of the piston's stroke (up in your diagram), and putting the propane/air valve at the bottom your cylinder.
Another idea would be to use a peizo-electric igniter as the spark. Think about this: when the piston hits the igniter's button as it ends its compression stroke, then it will cause the spark.
It looks like perhaps you are going with an electric valve? I suggest making it mechanical so that the top "touch valve" pshyically pushes open the propane/air valve via an external shaft.

Hope this helps,
-goose_man

EDIT: Damn, beaten to first post!
  • 0

User avatar
goose_man
Sergeant First Class
Sergeant First Class
 
Posts: 134
Joined: Sun Apr 08, 2007 6:37 am
Reputation: 0

Unread postAuthor: pat123 » Fri May 04, 2007 3:28 pm

thanks for the help i might try to build it soon i'll post pics when it's finished
  • 0

User avatar
pat123
Colonel
Colonel
 
Posts: 514
Joined: Sat Dec 23, 2006 10:08 pm
Location: S.C.
Reputation: 0

Unread postAuthor: lukemc » Sun May 06, 2007 1:39 pm

if you get it to work you shold hook it up to a kind of piston that pushes air though a 6mm barrel and you got a airsoft. machine gun [/b]
  • 0

"Those who are different change the world. Those who are the same keep it that way"
User avatar
lukemc
Colonel
Colonel
 
Posts: 565
Joined: Sun Feb 25, 2007 8:48 am
Location: NY
Reputation: 0

Unread postAuthor: frankrede » Sun May 06, 2007 2:30 pm

Why not use a solid propellant?
[ugh forum rules]
Alot easier in my opinion
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: From_Hamsterdam » Sun May 06, 2007 9:56 pm

If you make it i bet you end off worse then the door. The recoil of the piston/ram hitting something solid will be insane. Be very careful when testing this you could do your self some damage.

You are better off building a normal pneumatic or combustion and shooting out the door handle.
  • 0

Quote:"What if the Kangaroo's where explosives?"

From_Hamsterdam
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Thu Feb 15, 2007 8:26 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: spudzinger » Thu May 10, 2007 6:40 pm

check out the design of the Tippmann C3 it has some of the aspects that you are interested in (i.e. propane combustion)
  • 0


spudzinger
Sergeant First Class
Sergeant First Class
 
Posts: 135
Joined: Thu Feb 02, 2006 3:17 pm
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'