Water Rocket Parachute Deployment System

by capella_ben, published

Water Rocket Parachute Deployment System by capella_ben Apr 10, 2014
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This is my take on the classic Air Speed Flap system for deploying a parachute on a water rocket.

You need to make a simple and small parachute. I made mine from the bottom of a light shopping bag. I chopped it off and ran 4 strings from it to a central string that attached first to the base then to the cone. You also need a lightly inflated balloon to act as a spring.

The air speed flap needs a bit of another bottle glued on to it. This needs to be about 80mm * 30mm in size.

The idea of this is that when the rocket launches, the air pushed the flap down. This unlatches the cone. Under normal conditions it will flip open, but as the rocket is travelling upwards, the air pressure against the nose holds it in place. When it slows down, the spring overcomes this pressure and the parachute can fall out.\

This video might help. http://youtu.be/r16PdFdaIAM

This is designed for a 1.25L bottle.

This design has the rocket fins: http://www.thingiverse.com/thing:294744

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Just wondering if you happen to have the original files available? I would like to edit these for a standard size 2L bottle.


Has anyone actually made one of these? How did it go?

Please post up your makes!



Yeah, i'm curious about the launcher too.

the stand of the launcher, what did you make it off?

I made a simple launcher out of PVC pressure pipe. There is a size that fits perfectly in the neck of the bottle. The launcher is part of the pressure vessel until the rocket is launched, so you need to make it out of a really strong material (like PVC pressure pipe). Printed parts are really not strong enough to hold pressure (especially 100 PSI !!!). But I did print some parts for the launcher stand. One day I'll put together a new simple launcher with plans.
This site has some excellent info on launchers: http://www.aircommandrockets.com/rocket_launcher.htmhttp://www.aircommandrockets.c...
Have a look at this for the fins: http://www.thingiverse.com/thing:294744http://www.thingiverse.com/thi...

Water Rockets