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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.

Strig pull relise

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
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Brian
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Strig pull relise

Post by Brian » Fri Dec 12, 2008 6:53 pm

whats a good string pull relise mechanisim for a launcher.


Ascender Water Rockets
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Alex
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Re: Strig pull relise

Post by Alex » Fri Dec 12, 2008 9:40 pm

2 things to day

1. The Dictionary is your friend
2. Any good String that won't break after getting wet I guess. Maybe a thick rope. But not crazy thick. But you know, I don't think it really matters. as long as it's strong


Water Rockets are amazing things, One second there sitting on the launch pad, the next, splattered all over your shirt.

Graveyard
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Re: Strig pull relise

Post by Graveyard » Fri Dec 12, 2008 10:18 pm

Today?? hehe



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Alex
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Re: Strig pull relise

Post by Alex » Fri Dec 12, 2008 10:30 pm

Graveyard wrote:Today?? hehe
Elaborate


Water Rockets are amazing things, One second there sitting on the launch pad, the next, splattered all over your shirt.

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rockets-in-brighton
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Re: Strig pull relise

Post by rockets-in-brighton » Sat Dec 13, 2008 4:52 am

Brian wrote:whats a good string pull relise mechanisim for a launcher.
Depends on your launcher. Launch tube and cable tie, or Gardenia nozzles? Or something else? I use a cable tie with a short tube slipped over the ties. A plastic 'spring' sits under the tube to stop it dropping until you are ready, and the tube has a string attached that runs down the launcher and thru a cutoff bottle neck at the bottom. Pull the string, the tube is pulled down against the resistance of the spring and the ties release the rocket.


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Steve
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Re: Strig pull relise

Post by Aquafire » Mon Dec 15, 2008 9:02 am

rockets-in-brighton wrote:
Brian wrote:whats a good string pull relise mechanisim for a launcher.
Depends on your launcher. Launch tube and cable tie, or Gardenia nozzles? Or something else? I use a cable tie with a short tube slipped over the ties. A plastic 'spring' sits under the tube to stop it dropping until you are ready, and the tube has a string attached that runs down the launcher and thru a cutoff bottle neck at the bottom. Pull the string, the tube is pulled down against the resistance of the spring and the ties release the rocket.
I use a similar setup but I connect a lever to the bottom of the launcher and the cable tie ring. I made it with the lever just for convenience and then when I got scared that my rockets would burst I connected a rope to the lever for getting farther away from the rocket. After the rope was added I realized that the lever pulling the ring down was a neat idea because the leverage the lever gives makes it easier to pull the collar down and it doesn't need a big strong rope just a string to set it off.



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rockets-in-brighton
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Re: Strig pull relise

Post by rockets-in-brighton » Mon Dec 15, 2008 11:18 am

Aquafire wrote:I use a similar setup but I connect a lever to the bottom of the launcher and the cable tie ring. I made it with the lever just for convenience and then when I got scared that my rockets would burst I connected a rope to the lever for getting farther away from the rocket. After the rope was added I realized that the lever pulling the ring down was a neat idea because the leverage the lever gives makes it easier to pull the collar down and it doesn't need a big strong rope just a string to set it off.
That's a good idea. I hammer my launcher's support stake into the ground but I'm often worried that I'll pull so hard on the release cord that I'll tip the launcher off vertical. The extra leverage you get must make that less likely.


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Steve
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Graveyard
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Re: Strig pull relise

Post by Graveyard » Mon Dec 15, 2008 4:17 pm

Just messing with ya Dude!! :D
When I see someone correct another person using incorrect spelling, it's just kinda funny.
Today is one word, not two.
I was probably in a mood that day.
Later 8)



dongfang
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Re: Strig pull relise

Post by dongfang » Mon Dec 15, 2008 6:16 pm

Hi,

Did any of you with the string pull releases ever shift / tilt the rig, losing control of the direction?

I use a bicycle brake handle, with a wire inside a sleeve. There's no force on the launcher. The bicycle dealer has the sleeve on a long roll, so length is no problem there. But his wires are only a couple of meter max. Maybe somewhere you can get a longer steel wire.

One could also make a release mechanism that is default-open (using springs). A stick, pulled away with the string, keeps it closed. That will trigger with very little force.

Regards
Soren



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Alex
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Re: Strig pull relise

Post by Alex » Sun Dec 21, 2008 12:42 am

Graveyard wrote:Just messing with ya Dude!! :D
When I see someone correct another person using incorrect spelling, it's just kinda funny.
Today is one word, not two.
I was probably in a mood that day.
Later 8)
d'oh....I meant to say ''to say'' :oops: :lol:


Water Rockets are amazing things, One second there sitting on the launch pad, the next, splattered all over your shirt.

Graveyard
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Re: Strig pull relise

Post by Graveyard » Sun Dec 21, 2008 6:53 pm

It was still funny!!! :D
Have a nice Christmas everyone!
Later 8)



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Bibbleycheese
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Re: Strig pull relise

Post by Bibbleycheese » Sun Apr 18, 2010 4:39 pm

I had so much trouble with my launch string pulling my launcher over that I decided on a trigger mechanism that needs only a very light pull to operate.
So I use a strong spring to pull down a lever that pulls down the Gardena release - and the lever is chocked by a little trigger block which easily pulls out with a light tug.
Here is the end of the lever with the spring fixed, locked in place with the trigger block which is fixed to the frame by a hinge.
spring lock.jpg
And this one shows the whole arrangement. The string goes behind and exits left. Give it a little tug and the trigger block shifts out, the lever snaps down and pulls the Gardena release at the top.
spring lock2.jpg
The force needed to spring the release is very low - and I reckon I could use my RC system to activate the launch someday.
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- Andy
Little Squirts Water Rockets

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