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 36 users online :: 4 registered, 0 hidden and 32 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

mini hybrid fail

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Unread postAuthor: jackssmirkingrevenge » Mon Sep 06, 2010 12:43 am

Drilling a couple of holes like spudamine did here will certainly help, especially if you throw in a couple of screws.

Image

The problem in the case of this fail is that the alloy chamber is quite thin walled for the almost 1" diameter, meaning it can expand significantly, enough to pull away from the epoxy plug. In order to alleviate this problem, version 2 currently baking in the lab oven has a stainless chamber with around 1/16" wall thickness, much more appropriate for the forces involved.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: ilovefire » Mon Sep 06, 2010 1:16 am

well i am using 13mm ID 1mm walled aluminum so that should but enough for a few x hybrid.
cant wait to see how your new one performs, and maybe you should invest in some ear protection :lol: but im not really one to talk, i have had my ears ringing on more then one occasion and a complete momentary loss hearing playing with shall i say, magic powder :roll:
  • 0

User avatar
ilovefire
Colonel
Colonel
 
Posts: 511
Joined: Sat May 22, 2010 6:48 am
Reputation: 0

Unread postAuthor: Crna Legija » Mon Sep 06, 2010 1:26 am

With the amount a explosive fails jsr has had, he must have got some ear protection already :lol:
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Sep 06, 2010 1:31 am

ilovefire wrote:well i am using 13mm ID 1mm walled aluminum so that should but enough for a few x hybrid.


That looks about right, area goes down exponentially with diameter so you should be ok with good quality epoxy.

Again, looking at the way the plug popped out, it's clear that what happened was not that the epoxy sheared - indeed the parts that were moulded into the roughened bits were still apparent on the sides of the plug - but the chamber expanded outwards and pulled away.

The only time my ears were really ringing was when in my adolescence I rather stupidly put some magic powder in a steel 55 gallon drum with an open top, I was tone deaf for a good few minutes :roll: ah, the innocence of youth...
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: ilovefire » Mon Sep 06, 2010 1:40 am

jackssmirkingrevenge wrote:
ilovefire wrote:well i am using 13mm ID 1mm walled aluminum so that should but enough for a few x hybrid.


That looks about right, area goes down exponentially with diameter so you should be ok with good quality epoxy.


well thats good, i used some 3500psi stuff i got

jackssmirkingrevenge wrote:The only time my ears were really ringing was when in my adolescence I rather stupidly put some magic powder in a steel 55 gallon drum with an open top, I was tone deaf for a good few minutes :roll: ah, the innocence of youth...


oxy/propane in a mini will do it to :lol:
  • 0

User avatar
ilovefire
Colonel
Colonel
 
Posts: 511
Joined: Sat May 22, 2010 6:48 am
Reputation: 0

Previous

Return to Hybrid Cannon Discussion

Who is online

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

Reputation System ©'