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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.

Reliable timer release

Discussion about deployment systems including altimeters, timers, air speed flaps, servo systems, and chemical reactions.
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SaskAlex
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Reliable timer release

Post by SaskAlex » Thu Apr 29, 2010 2:40 pm

Well last year I made the first version of my current parachute deployment system. There are virtually no external parts, it's light (just 48 grams without parachute), and it hasn't failed me yet. I thought it was rather unique until I saw Air Command's video of their system, which is fairly similar.

I'm not much for computer animations, so I just took a bunch of pictures.
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wracing
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Re: Reliable timer release

Post by wracing » Sat May 08, 2010 3:26 am

Very Nice! Thanks for sharing.

Best - W



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U.S. Water Rockets
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Re: Reliable timer release

Post by U.S. Water Rockets » Sun May 09, 2010 12:35 am

Would this be the same system you use on your recent 1000+ foot launches?

That's really impressive that you have managed to break 1000 feet without resorting to all of the fancy technology that people have been trying to use for years and have failed. You better be careful because you're going to make everyone jealous! LOL!

Great work!



SaskAlex
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Re: Reliable timer release

Post by SaskAlex » Tue May 11, 2010 9:45 pm

U.S. Water Rockets wrote:Would this be the same system you use on your recent 1000+ foot launches?

That's really impressive that you have managed to break 1000 feet without resorting to all of the fancy technology that people have been trying to use for years and have failed. You better be careful because you're going to make everyone jealous! LOL!

Great work!
Yes, this is the system I have been using on all my recent launches. I think the key to a reliable mechanical release is simplicity. And I don't think you can make any electronic system lighter than a simple mechanical one like mine. I think the advantages of fancy technology are that it can be easier to make it dependable, and they can have greater ease of use. I just finished my second year of electronic systems engineering, so I'm sure I'll be trying out some more high tech methods in the not-too-distant future. For now, though, I'm really happy with this system.



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Tim Chen
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Re: Reliable timer release

Post by Tim Chen » Wed May 12, 2010 1:10 pm

Alex,

Do you have a timer on the boosters as well as one on the sustainer?


Tim Chen
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SaskAlex
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Re: Reliable timer release

Post by SaskAlex » Thu May 13, 2010 7:22 pm

Tim Chen wrote:Alex,

Do you have a timer on the boosters as well as one on the sustainer?
Yes, the booster has it's own timer. The parachute just sits on top of one of the bottles making up the booster, and long elastic runs over top of it and to a timer on the side of the bottle. I don't care about the aerodynamics of the booster since it travels such a short distance, so it's a really simple set up.



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