Hi,
Just some pictures I shot yesterday, doing pressure tests. Different from the way you do it??
The 4 * 1.5 liter Coca-Cola bottle rocket started leaking after 5-6 bar.
The large rocket exploded.
The other 2 were good for at least 7 bar.
The single bottle held out to 10 bar, and it could possibly have taken some more.
FINALLY, I got a bottle qualified for the plane.
Regards
Soren
Pressure tests...
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dongfang
- WRA2 Member
- Posts: 210
- Joined: Thu Jun 19, 2008 6:29 pm
Pressure tests...
- Attachments
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- 4 pressure vessels to test, from back to front: 7 * more or less whole 2 liter bottle rocket, (3 + 1/3) * 2 liter rocket (for shuttle plane), 4 * 1.5 liter Coca-Cola rocket (backup article for shuttle plane), 3 * 2 liter rocket (for shuttle plane) and a single bottle for reference.
- DSC_1029.JPG (57.28 KiB) Viewed 183 times
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- The burst test bunker - just some steel gratings and my old 110 mm PN16 PVC pipe (which I wanted to use as a chamber for a mega potato cannon!). Small rockets fit inside the pipe.
- DSC_1031.JPG (138.23 KiB) Viewed 183 times
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- The 4 * 1.5 liter Coca-Cola rocket had a non catastrophic failure. It simply started leaking. I did use 2 * 1.5 liter Cola-Cola to 9 bar once, so I must have been unlucky this time.
- DSC_1033.JPG (96.16 KiB) Viewed 183 times
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- ARGH. My 7 bottle large rocket (actually the center section of the one that crashed through the roof, with new front and rear) failed - right in the middle.
There was nothing than a small splat of water and half the rocket creeping half a meter away - very undramatic. Failed at approx. 6.5 bar. - DSC_1035.JPG (108.82 KiB) Viewed 183 times
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- In detail. The Sprite bottle was glued over the transparent C-C bottle. The Sprite has torn all the way around, but the glue seam hasn't failed! I used a "flap wheel" to roughen the bottles when gluing - NOT some deep cutting grindstone thing. Still, my splices always fail around the top or the bottom, not in the middle - it indicates to me that I roughen too deep??
- DSC_1034.JPG (92.26 KiB) Viewed 185 times
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Tim Chen
- WRA2 Member
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- Joined: Wed Jan 31, 2007 1:44 am
Re: Pressure tests...
Hi!
What is the dark colored pipe that is in the one rocket? Is that a nozzle or just part of the test setup you use for the pressure testing?
What is the dark colored pipe that is in the one rocket? Is that a nozzle or just part of the test setup you use for the pressure testing?
Tim Chen
Captain, Team Enterprise
Captain, Team Enterprise
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dongfang
- WRA2 Member
- Posts: 210
- Joined: Thu Jun 19, 2008 6:29 pm
Re: Pressure tests...
Hi,
It's the "carburettor" - an air / water mixer tube. It makes the rocket accelerate slower, burn longer and go higher!
Regards
Soren
It's the "carburettor" - an air / water mixer tube. It makes the rocket accelerate slower, burn longer and go higher!
Regards
Soren
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dongfang
- WRA2 Member
- Posts: 210
- Joined: Thu Jun 19, 2008 6:29 pm
Re: Pressure tests...
Hi,
Hmm this link is what I meant. Same thread, but a little further down.
(could the jury be persuaded to turn on post-submit edit of posts? Many other forums have that).
Regards
Soren
Hmm this link is what I meant. Same thread, but a little further down.
(could the jury be persuaded to turn on post-submit edit of posts? Many other forums have that).
Regards
Soren