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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

Pressure tests...

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dongfang
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Pressure tests...

Post by dongfang » Mon Dec 29, 2008 9:20 pm

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
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Tim Chen
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Re: Pressure tests...

Post by Tim Chen » Tue Dec 30, 2008 2:31 pm

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?


Tim Chen
Captain, Team Enterprise

dongfang
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WRA2 Member
Posts: 210
Joined: Thu Jun 19, 2008 6:29 pm

Re: Pressure tests...

Post by dongfang » Tue Dec 30, 2008 7:30 pm

Hi,

It's the "carburettor" - an air / water mixer tube. It makes the rocket accelerate slower, burn longer and go higher!

Regards
Soren



dongfang
WRA2 Member
WRA2 Member
Posts: 210
Joined: Thu Jun 19, 2008 6:29 pm

Re: Pressure tests...

Post by dongfang » Tue Dec 30, 2008 7:33 pm

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



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