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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.

In Search of Stability

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
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retrotec29
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Re: In Search of Stability

Post by retrotec29 » Sat Sep 23, 2017 6:56 pm

I had a little time after work today so I hit the park. Here is a little vid with the 8" GB zip ties on a schedule 20 1 1/2" ID collar. Two liter bottle with one half liter water at 100 psi.

https://youtu.be/USwHpn86Jx4

Looks like the release was a 3.25-3.5 lbs.
Sorry about the double post earlier. My internet was a little weird.


No matter where you go, there you are. Buckaroo Banzai

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Pere Ubu
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Re: In Search of Stability

Post by Pere Ubu » Sun Sep 24, 2017 5:40 pm

There's a lot here for me to think about as I plan Launcher v 2.0 - the present one has air pressure all the way through it, and I think I'll build the base separate from the launch section so's I can drill some holes for tent pegs. In addition, I saw a neat launcher on YouTube that uses a Gardena-type head but has springs keeping the connector retracted, and a large washer pulled out to let the connector spring back. Viz:

https://www.youtube.com/watch?v=2Svxw5j1OmU


Why your rocket is unstable = CN⍺1/2⍴v2⍺Ar

Northeast Pataphysical Institute, Aerospace Division

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retrotec29
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Re: In Search of Stability

Post by retrotec29 » Mon Sep 25, 2017 9:09 pm

I like it. A great example of thinking outside the box. Ha! Looks like you really like the Gadena nozzle and collar. That’s cool. I did add a Gadena adapter for my launcher that is actuated by the pull string. Getting the release to work with a manageable tension was a challenge but the solution was simple. I took the locking collar apart and cut the spring down. Fish scale puts the realease tension at 3 lbs.
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No matter where you go, there you are. Buckaroo Banzai

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Pere Ubu
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Re: In Search of Stability

Post by Pere Ubu » Tue Sep 26, 2017 8:13 am

retrotec29 wrote:I like it. A great example of thinking outside the box. Ha! Looks like you really like the Gardena nozzle and collar.
I like a problem-solving challenge. ;)
I took the locking collar apart and cut the spring down.
I tried following George Katz's advice on his YouTube video about how to take the collar apart, and I couldn't get the plastic strips to unlock it.


Why your rocket is unstable = CN⍺1/2⍴v2⍺Ar

Northeast Pataphysical Institute, Aerospace Division

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