Pneumatic Deploy System

Discussion about deployment systems including altimeters, timers, air speed flaps, servo systems, and chemical reactions.
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Tim Chen
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Re: Pneumatic Deploy System

Post by Tim Chen »

monboy10 wrote:sorry if this is a little off topic but you use a servo to bust a baloon that wuold then make the nose cone fall off
We thought of using a bit of nichrome wire to heat up and melt the balloon to do the same thing. It would be lighter. It's just something we have not had time to develop. Feel free to experiment with the concept if you think it would work!
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monboy10
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Re: Pneumatic Deploy System

Post by monboy10 »

Tim Chen wrote:
monboy10 wrote:sorry if this is a little off topic but you use a servo to bust a baloon that wuold then make the nose cone fall off
We thought of using a bit of nichrome wire to heat up and melt the balloon to do the same thing. It would be lighter. It's just something we have not had time to develop. Feel free to experiment with the concept if you think it would work!
ok do you have any idea of how to make a senser that is simple and cheap to turn on a power source
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Alex
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Re: Pneumatic Deploy System

Post by Alex »

I don't even know what ''Pnuematic'' means :(


But my advice is, do all the idea that come to you, eventually, one will work....That means lots of tests my friend :). So drink los of coffee....
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Brian
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Re: Pneumatic Deploy System

Post by Brian »

Pnuematics are like hydraulics. hydraulics use liquids and Pnuematics use use gas.
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Re: Pneumatic Deploy System

Post by dongfang »

Hi,

I just saw this thread now...

About pneumatic deployment: From my time as a potato cannon builder, I learned that valves in general are heavy. Also the PVC ones that I home built (but on the other hand they were darn fast, too). They will also not survive a crash.

I would suggest: Get a PVC "union" fitting. That is basically two flanged pipe ends with a rubber gasket between them, that are pressed against each other by some threaded parts around them.
Now cut a burst disk of some suitable material, and put it between the flanges of the union to block it. Invent some kind of percussion bolt or whatever, that causes the disk to rupture on servo command.

You can search for "burst disk hybrid potato gun" to see union burst disks.

Connect one end of the union to a compressed air bottle (via a short piece of 20 mm pipe maybe) and the other end to the parachute container (that could be another bottle with the bottom cut off).

On the other hand ... why shoot out a parachute with pressure? Mine have always blown overboard nicely and deployed when the nosecone over them came off.

Regards
Soren
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Alex
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Re: Pneumatic Deploy System

Post by Alex »

Brian wrote:Pnuematics are like hydraulics. hydraulics use liquids and Pnuematics use use gas.
Oh
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U.S. Water Rockets1
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Re: Pneumatic Deploy System

Post by U.S. Water Rockets1 »

dongfang wrote:Hi,

I just saw this thread now...

About pneumatic deployment: From my time as a potato cannon builder, I learned that valves in general are heavy. Also the PVC ones that I home built (but on the other hand they were darn fast, too). They will also not survive a crash.

I would suggest: Get a PVC "union" fitting. That is basically two flanged pipe ends with a rubber gasket between them, that are pressed against each other by some threaded parts around them.
Now cut a burst disk of some suitable material, and put it between the flanges of the union to block it. Invent some kind of percussion bolt or whatever, that causes the disk to rupture on servo command.

You can search for "burst disk hybrid potato gun" to see union burst disks.

Connect one end of the union to a compressed air bottle (via a short piece of 20 mm pipe maybe) and the other end to the parachute container (that could be another bottle with the bottom cut off).

On the other hand ... why shoot out a parachute with pressure? Mine have always blown overboard nicely and deployed when the nosecone over them came off.

Regards
Soren
There are small lightweight pneumatic valves which are used on model aircraft to deploy landing gear which work well as rocket parachute deploy valves except they are somewhat costly and fragile. This might be an option if you think this is the kind of deploy you want to use.
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