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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 the snow!!!

Post photos and videos of your rocket, launches and your onboard video or photos here. A wide variety of formats supported including attachments and embedded youtube.
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In the snow!!!

Post by bugwubber » Tue Jan 28, 2014 3:00 pm

My battery was not convinced it should be making electricty at this temp, and my mini compressor didn't think I was serious. The valve stem had a bit of an ice jam at first. I had to take the launcher inside to warm up and blow out the ice blockage.

I then sprayed down the launch tube and valve stem with wd-40.

Loading the launcher upside down helped keep the lauch tube clear.


http://www.youtube.com/watch?v=boMRYzeoeME


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Re: In the snow!!!

Post by Reptiglorandrockets » Tue Jan 28, 2014 7:45 pm

Very cool! I love how there is a brief trail of snow when the rocket launches. I wounded how the rocket would perform with a reduced nozzle? I'm very surprised that the snow did not melt from pressurization. Great work!


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Re: In the snow!!!

Post by bugwubber » Tue Jan 28, 2014 9:50 pm

Reptiglorandrockets wrote:Very cool! I love how there is a brief trail of snow when the rocket launches. I wounded how the rocket would perform with a reduced nozzle? I'm very surprised that the snow did not melt from pressurization. Great work!
I don't own any plastic garden hose connectors- just brass and aluminum, otherwise I'd try.

I wonderd about the pressure as well but I only went to 60psi and it is flippin cold; 40 deg F below the freezing point of water. Think it'd take much more to cause phase change.


Will have to get out to the field and try this properly.

Oh almost forgot the science: I filled the bottle almost completely full of snow and it still felt light. All of the snow was expelled.

Thanks,

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Re: In the snow!!!

Post by bugwubber » Tue Jan 28, 2014 10:24 pm

Thanks for the idea DogLover, that was a lot of fun!

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Re: In the snow!!!

Post by bugwubber » Tue Jan 28, 2014 10:47 pm

Interesting frame grab from the video. Looks like snow rings.
CAM00661_9415_4101.jpg
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Re: In the snow!!!

Post by Reptiglorandrockets » Wed Jan 29, 2014 12:09 am

bugwubber wrote:Interesting frame grab from the video. Looks like snow rings.
CAM00661_9415_4101.jpg
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Shock diamonds of a snow rocket? :-)


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Re: In the snow!!!

Post by Spaceman Spiff » Wed Jan 29, 2014 10:44 pm

You're the guy whose video I was watching yesterday! Nice to meet you!


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Re: In the snow!!!

Post by bugwubber » Thu Jan 30, 2014 12:07 pm

Spaceman Spiff wrote:You're the guy whose video I was watching yesterday! Nice to meet you!
Howdy :-)

Hope you liked.. well wait we're talking about the snow rocket video right? LOL

My son has discovered my Calvin and Hobbes collection and has recently been running around the house pretending to be Spaceman Spiff.

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Re: In the snow!!!

Post by bugwubber » Fri Feb 14, 2014 10:31 am

Here's the video in slow motion with a few freeze frames at the end.

http://www.youtube.com/watch?v=TL4uMRfXz9A

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Re: In the snow!!!

Post by Water Rocket Expert » Fri Feb 14, 2014 4:15 pm

How much pressure was there? And I see that some people connect their bottles through the bottom. How do I do that. It has snowed recently here so I will have to wait to launch my new rocket with the servo chron. When I do I will try to post the on board video.



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Re: In the snow!!!

Post by bugwubber » Fri Feb 14, 2014 6:48 pm

This is actually a single bottle rocket. Just a bottle cap glued on to the top of the bottom bottle.
60 psi for testing in the yard.


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Re: In the snow!!!

Post by Water Rocket Expert » Sat Feb 22, 2014 2:31 pm

Why is there another bottle glued on. Does this have a deploy system in it?


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Re: In the snow!!!

Post by bugwubber » Sat Feb 22, 2014 6:23 pm

Water Rocket Expert wrote:Why is there another bottle glued on. Does this have a deploy system in it?
Top bottle- holds ballast water
(friction fit, held in place by the fairing)
Middle bottle- cargo bay (camera, altimeter)
(screwed into a bottle cap which is glued to the)
Bottom bottle- pressure vessel

If a crash damages the top bottle or bottom bottle, it is easily replaceable.


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Re: In the snow!!!

Post by U.S. Water Rockets1 » Sat Feb 22, 2014 11:48 pm

bugwubber wrote:
Water Rocket Expert wrote:Why is there another bottle glued on. Does this have a deploy system in it?
Top bottle- holds ballast water
(friction fit, held in place by the fairing)
Middle bottle- cargo bay (camera, altimeter)
(screwed into a bottle cap which is glued to the)
Bottom bottle- pressure vessel

If a crash damages the top bottle or bottom bottle, it is easily replaceable.
That's a good way to take car of all the potential problems with a water rocket. You have ballast for stability, a crush zone to protect the electronics, and a module section design that allows damaged parts to be quickly replaced. That's a textbook example of efficiency.


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Re: In the snow!!!

Post by bugwubber » Fri Feb 28, 2014 4:59 pm

U.S. Water Rockets1 wrote:
bugwubber wrote:
Water Rocket Expert wrote:Why is there another bottle glued on. Does this have a deploy system in it?
Top bottle- holds ballast water
(friction fit, held in place by the fairing)
Middle bottle- cargo bay (camera, altimeter)
(screwed into a bottle cap which is glued to the)
Bottom bottle- pressure vessel

If a crash damages the top bottle or bottom bottle, it is easily replaceable.
That's a good way to take car of all the potential problems with a water rocket. You have ballast for stability, a crush zone to protect the electronics, and a module section design that allows damaged parts to be quickly replaced. That's a textbook example of efficiency.
All ideas that came about while studying at the School of Hard Knocks.


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