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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.

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Parachute Packing

Discussion about deployment systems including altimeters, timers, air speed flaps, servo systems, and chemical reactions.
Andrew Leigh
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Parachute Packing

Postby Andrew Leigh » Mon Aug 23, 2010 9:42 am

HI,

have had a look but can't seem to locate any subject matter.

What are the tricks of the trade when it comes to packing parchutes i.e. Tight, loose rolled up etc. etc.

Cheers
Andrew
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Re: Parachute Packing

Postby SaskAlex » Mon Aug 23, 2010 11:06 am

Well, it depends on some different factors. If your rocket flies really high, you can pack your parachute tighter because it will have more time to open up. If it doesn't fly too high, you might want it to open up really fast. For a faster opening, try folding it in half, then make radial zig-zag folds to get a small wedge. Then zig-zag fold it in the other direction and wrap your lines around it, not too tightly.

I've never had a parachute that failed to open (many failed deployments, but that's another issue), but that's partially luck. I once had a parachute that was stuck closed and finally opened up about 15 feet or less from the ground. I couldn't believe my luck.
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Re: Parachute Packing

Postby SaskAlex » Mon Aug 23, 2010 11:54 am

SaskAlex wrote:For a faster opening, try folding it in half, then make radial zig-zag folds to get a small wedge. Then zig-zag fold it in the other direction and wrap your lines around it, not too tightly.


Okay, so instead of saying "zig-zag fold" in there, I really meant to say "accordion fold." Just keep alternating the direction of the fold. It will open up much quicker that way.
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Re: Parachute Packing

Postby Andrew Leigh » Mon Aug 23, 2010 1:59 pm

Hi,

thanks for the response, I understand the accordian fold and it make perfect sense. The rocket will not be going too high, it is a Science Fair project for my grandson so we are more interested in a good launch, perfect flight and safe recovery rather than altitude.

After the Fair is over .......... well maybe the pressure will be cranked up just a wee tad. :twisted:

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Andrew
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Brian
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Re: Parachute Packing

Postby Brian » Tue Aug 24, 2010 1:51 am

Good luck in the Science Fair.
it's hard to pack it wrong, just make sure the parachute isn't sticky before launch instead of after launch (a crash).
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Re: Parachute Packing

Postby SaskAlex » Tue Aug 24, 2010 10:11 am

Oh, and if it's a plastic bag parachute it's best to let it hang open for some time before the launch. Don't pack it until just before.
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Re: Parachute Packing

Postby rockets-in-brighton » Tue Aug 24, 2010 1:56 pm

SaskAlex wrote:Oh, and if it's a plastic bag parachute it's best to let it hang open for some time before the launch. Don't pack it until just before.


And talcum powder (baby powder) can be liberally applied as a dry lubricant.
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Andrew Leigh
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Re: Parachute Packing

Postby Andrew Leigh » Tue Aug 24, 2010 2:59 pm

Hi,

both sound like very practical solutions. I suppose the plastic would get a "memory" and or the slightest moisture would cause some sticking together.

I will comply.

Thanks
Andrew
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Re: Parachute Packing

Postby pudresful » Sat Sep 04, 2010 10:06 am

Thats my way ;)[youtube][/youtube]http://www.youtube.com/watch?v=NDEn1YLNghs
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Re: Parachute Packing

Postby pudresful » Sat Sep 04, 2010 10:24 am

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Re: Parachute Packing

Postby U.S. Water Rockets1 » Sat Sep 04, 2010 9:33 pm

Andrew Leigh wrote:Hi,

both sound like very practical solutions. I suppose the plastic would get a "memory" and or the slightest moisture would cause some sticking together.

I will comply.

Thanks
Andrew


If you leave it folded for a long time, then changes in weather/humidity can cause a static buildup inside the chute as well as the "memory" of the folds. The chute will want to stick to itself and could fail to open. It's good practice to let the parachute hang out flat until just before you launch it.
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Re: Parachute Packing

Postby Andrew Leigh » Wed Sep 08, 2010 5:58 am

Hi,

good advice thanks, I had wondered about that.

Regards
Andrew
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Re: Parachute Packing

Postby Marvin » Mon Sep 08, 2014 3:30 pm

Good video pudresful. Talcolm powder hasn't worked too well for me. It just seems to fall out.
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Re: Parachute Packing

Postby U.S. Water Rockets1 » Sat Sep 13, 2014 10:47 pm

Marvin wrote:Good video pudresful. Talcolm powder hasn't worked too well for me. It just seems to fall out.


What do you mean it falls out? The powder or the parachute?
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