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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.

My (first) parachute deployment system...

Discussion about deployment systems including altimeters, timers, air speed flaps, servo systems, and chemical reactions.
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dongfang
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My (first) parachute deployment system...

Post by dongfang » Mon Jun 23, 2008 5:44 am

Hi,

Just want to show you a simple parachute deployment thing I made.

It's all made out of an umbrella that someone wanted to throw away the other day - I had it instead. It was one of those "pocket" ones where the rods are made of many parts that fold together.

It is one of those with a rubber band around the nosecone of the rocket. Down the side of the rocket hangs a lever that releases end of the rubber band, releasing the nosecone and deploying the chute. The rubber band makes the lever swing up and release it, but:

- Before launch, a pin holds the lever down
- During boost phase, the acceleration keeps the lever down
- During the coast to apogee phase, the air keeps it down
- Finally at v=0, it relases...

The parachute is the fabric thing from the umbrella, and the other parts from the structure... and I made a balsawood hinge thing.

Next, I need to make a nosecone that doesn't wedge down so hard over the rocket. It jammed a couple of times. Maybe I will glue the bottom part of a bottle (just the bottom 1 cm) on the top of the rocket, so it forms a well that the nosecone can stand in.

Regards
Soren
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Tim Chen
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Re: My (first) parachute deployment system...

Post by Tim Chen » Mon Jun 23, 2008 7:58 am

Hey Soren, congrats on your first parachute deploy design! Nice to see other people experimenting and refining their ideas. I don't think a lot of people use the air speed flap and even fewer use it with a vertical deploy. Most I've read about use a side opening door. Thanks for posting the pix.


Tim Chen
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dwrrule
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Re: My (first) parachute deployment system...

Post by dwrrule » Mon Jun 23, 2008 5:18 pm

I agree its nice to see someone creat something new an see how it works. Great job!!!!



castle-bravo
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Re: My (first) parachute deployment system...

Post by castle-bravo » Sun Sep 06, 2009 4:06 am

nice system i need to post some of mine soon on the web



Captoman
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Re: My (first) parachute deployment system...

Post by Captoman » Tue Oct 20, 2009 10:51 pm

That looks great! What size do you think is ideal for the area of a speed flap? I'm working on something similar right now.



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