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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.

Laucher with Rocket

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
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Laucher with Rocket

Post by janssene » Wed May 18, 2011 3:16 pm

This weekend we have a boy scouts weekend. As the weather forecast is predicting a sunny weekend we have decided that we will build water rockets with the kids. So this was a good time to upgrade my ty-rap laucher.
I've not been using it lately as i'm currently experimenting with restricted 9mm nozzles (gardena launcher).

When using a non-restricted nozzle it's easier for the kids to build a stable rocket.

This is what I did...

- Added more ty-raps. Allowing more pressure.
- Added the lauch pad
- Used a bicycle valve as airhose connector. Now a compressor and a regular foot pump can be used. I use a piece of regular waterhose to connect it to the launchpad.

Works like a charm !

With my first test launch I used a 2L bottle with fins glued to the bottle. However due to hard landings the fins broke. Therefor i've decided to make them more rigid. Hope they will not break this time.
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Re: Laucher with Rocket

Post by pudresful » Sat May 21, 2011 1:03 pm

heres my instructions... [youtube][/youtube]

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Re: Laucher with Rocket

Post by U.S. Water Rockets1 » Sat May 21, 2011 11:03 pm


A couple of suggestions for your fins:

First of all, you should use a swept wing design because they will shed air along the leading edge more easily and reduce the drag.
Angled wings also are less prone to snagging on tree branches or power lines, etc.
Lastly, you should look for plastic fasteners, as pop rivets and screws are metal and are more dangerous in the event of a mishap.

Good luck with the rockets!

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