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

In total there are 52 users online :: 3 registered, 0 hidden and 49 guests

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

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

The Team
Global Moderators
global_moderators.png CS

Army drinks bottle combustion chamber?

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
  • Author

Unread postAuthor: Ragnarok » Sun Dec 21, 2008 6:17 pm

Hotwired wrote:It'll be fine as long as that burst disk isn't to make it a hybrid chamber of any note.

I'm completely serious when I say I've seen vessels of similar shape, integrity and material to canteens fail at under 100 psi, and far less under repeated or shock loads - and of course, combustions would provide both.

If it's done I give it a very real chance of breaking apart around the "equator" between the two sides. It might not be a failure that would cause injury, but it would still be rendered useless.

I don't know what experience you have with uneven cross sectioned pressure vessels, but I've done enough testing of them to know to avoid them like the plague.

As there are far safer, more practical, and less gimmicky materials which are far better suited to the task of being a pressure chamber than this, I strongly recommend against it's use - not because it will fail and cause injury - for the chances of that in this case are small - but because it runs a far greater chance of becoming a waste of money and materials.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Chief of Staff
Chief of Staff
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: Hotwired » Sun Dec 21, 2008 8:03 pm

I'm not saying it's not a waste of a good drinks bottle. It is, and there's a lot of things I'd use before one.

Basic combustion can be held by quite a lot of things intended for fluid containment, even fizzy drink bottles whose heat issues are rather limiting as they can crumple after one shot.

I know on the other hand that such robust drinks bottles are heat resistant
to not crumple unless theres some very substantial build up of heat (somewhere rather hotter than is comfortable to hold bare handed) and that the time to recharge it is likely to be sufficient to lose enough retained heat to not make that an issue for weak points.

Non spherical or cylindrical with appropriate ends vessels are less than ideal. No news to either of us. Yes I have done testing involving heat and pressure on various containers. I have some interesting bottles about 3x their original volume around somewhere.

The only disagreement is on the chance of failure.
  • 0

User avatar
Lieutenant General
Lieutenant General
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0


Return to Construction Materials/Ammo Discussion

Who is online

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

Reputation System ©'