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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.

Effect Propellants

Members post instructions to construct water rockets, launchers, deployment systems, staging mechanisms, splicing bottles, and payloads.
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ctrout
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Effect Propellants

Post by ctrout » Sun Feb 14, 2010 3:05 pm

Hello all
I'm working on a project and I could use some help.
Its more or less water rockets with a twist.
My alt is only 10 to 20 feet
I would like to build a release system "Air/water" to lift light weight foam formers with dry leaves to a alt of 10 to 20 feet.
More or less I need it to make a small mess in the air
no more then a hand full of dry leaves need to go up but.. I would like to make 8 to 10 units launch with only 4 pulls of a string.

Now some back round
I have built a Infra red system that will move 2 servos.
each servo will move 1/4 of a turn after a hit to the move each servo with a total of 4 hits 4 movements to release the effects.
this is to simulate ground attacks. small Foam buildings ect.

For now I could use some vary simple Ideas of how this can be done.
Thanks for your time
Clayton



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Brian
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Re: Effect Propellants

Post by Brian » Mon Feb 15, 2010 4:13 am

if you are trying to deploy a payload of leaves 10 to 20 feet high, you could attach a split nosecone to a bottle with strings at the tip of the 2 nosecone halves which sit on the bottle. make sure the rocket is bottom heavy because this would destabilize the rocket and make it flip making the nosecone fall off and split releasing the leaves. i can upload a picture if you want.
what is this for?


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Spaceman Spiff
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Re: Effect Propellants

Post by Spaceman Spiff » Mon Feb 15, 2010 1:29 pm

ctrout wrote:Hello all
I'm working on a project and I could use some help.
Its more or less water rockets with a twist.
My alt is only 10 to 20 feet
I would like to build a release system "Air/water" to lift light weight foam formers with dry leaves to a alt of 10 to 20 feet.
More or less I need it to make a small mess in the air
no more then a hand full of dry leaves need to go up but.. I would like to make 8 to 10 units launch with only 4 pulls of a string.

Now some back round
I have built a Infra red system that will move 2 servos.
each servo will move 1/4 of a turn after a hit to the move each servo with a total of 4 hits 4 movements to release the effects.
this is to simulate ground attacks. small Foam buildings ect.

For now I could use some vary simple Ideas of how this can be done.
Thanks for your time
Clayton
I think you could build standard cable tie launchers and connect them all to a single pull string. If you used a fairly heavy weight to pull the release strings, you could make a trigger to drop the weight based on the servo. That way the servo would not have to be very powerful but you could amplify the pulling force by using it to drop a heavy weight.


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ctrout
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Re: Effect Propellants

Post by ctrout » Mon Feb 15, 2010 3:27 pm

That's it!
use the servo to pull a pin holding a weight !
3 years and I could not think of that. that is a bigtime help!

The other area I need some advice is to release 2 or 3 or more in sequence. a delay of 1 second without the need of the servo to pull again.
I was thinking about rubber bands. wind them up to hold some type of release pin and when it unloads each one will let go in sequence
I'm thinking about what you just taught me but I think I'm still in overload mode.
thanks again
Clayton



ctrout
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Re: Effect Propellants

Post by ctrout » Mon Feb 15, 2010 8:41 pm

Will It work?
Thinking 20 oz size 12"x8"x24"h Foam Building
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ctrout
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Re: Effect Propellants

Post by ctrout » Sat Feb 20, 2010 5:10 pm

Almost have it...
one more try.



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U.S. Water Rockets1
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Re: Effect Propellants

Post by U.S. Water Rockets1 » Sun Feb 21, 2010 12:08 am

ctrout wrote:Will It work?
Thinking 20 oz size 12"x8"x24"h Foam Building
That's a pretty slick idea for force multiplication. If you guys build this design, please post a video and show us all how it works. It seems like a very simple idea that would work very well!


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ctrout
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Re: Effect Propellants

Post by ctrout » Wed Feb 24, 2010 11:56 pm

The multi staged release from one servo to save on battery's and air valves to sustain air psi is a little rough but I think a multi servo systems will do it.
straight up.
This will be a mock up Foam village for a combat simulation WWII RC Aircraft
The Idea is to use a RC Bomber set up with Foam drop bomb bay load released over the target village to simulate hits.
Its part of a Combat Simulation Aircraft design called Air2AirCombat.
I will be happy to post what we get everything done
Thanks for the help all
wish us luck
Clayton

See ya in the sky!



ctrout
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Re: Effect Propellants

Post by ctrout » Sun Aug 08, 2010 6:05 pm

http://www.airtoaircombatllc.com/images ... et%202.JPG
http://www.airtoaircombatllc.com/images ... et%201.JPG
Sometime over the winter We will build a more interesting design now that we know it works!
Trout



ctrout
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Re: Effect Propellants

Post by ctrout » Sat Aug 14, 2010 4:17 pm

This was the first test and the shorter vid.
[youtube][/youtube]
Have a good one
trout



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