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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.

*sigh* Really simple (but rule destroying) crushing sleeve design

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Alien Space Agency
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*sigh* Really simple (but rule destroying) crushing sleeve design

Post by Alien Space Agency » Sun Apr 15, 2018 10:49 am

15238028152881793495844.jpg
DISCLAIMER:
I did not uber detail how I made this stager, because I am encouraging you to improvise. That way you can make your own version of the stager that would suit your liking. Also, the aluminum tube is in the center of the rocket, which reduces the chance of you getting hit by metal shrapnel.


Here are the materials you need:

-hand soap bottle with dispenser
-12mm ALUMINUM tube
-a caulk tube nozzle with a large lip
-16mm reinforced / unreinforced garden hose
-some seals that suit your style

NOZZLE

Cut the aluminum tube to your desired length as long as it isn't less than 96mm (8x the tube diameter). Sand if desired.

Get the pump housing of the soap dispenser and cut it in half. The upper half will be used on the nozzle, the bottom half will be the sleeve's non return valve. Keep the ball bearing and the sealer of the pump.

As expected the ID of the pump housing is ~13mm. Use electrical tape on the tip of the tube to close that 1mm gap. You will be left with a gap in the tip. Fill it with epoxy.
15238029614001714090314.jpg
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This way, you can use the dispenser's bottle cap.
Find a seal that suits it. A flat seal from a Gardena nozzle will work wonders.


CRUSHING SLEEVE

With the bottom end of the pump housing, the only thing you need to do is to stop the tiny ball from coming out. Find a way to do it if the sealer doesn't work.

Cut the hose the exact same length as the aluminum tube. Fit the hose over the non return valve as if it was a hose barb.

The caulk nozzle will be modified to hold the sleeve in place. Cut the nozzle's cone where it will let the aluminum tube pass through. Fit it to the opposite side of the hose. Find a seal that suits it.
Use another dispenser cap to hold it in place.
15238034913871485184055.jpg
Fly high people.
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anachronist
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Re: *sigh* Really simple (but rule destroying) crushing sleeve design

Post by anachronist » Mon Apr 16, 2018 10:02 am

The "rule destroying" part seems to be the metal tube. Is there anything remaining that violates rules if you find a plastic tube that's the right diameter? Maybe substitute a nylon ball bearing for the steel ball?



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Re: *sigh* Really simple (but rule destroying) crushing sleeve design

Post by Alien Space Agency » Mon Apr 16, 2018 10:32 am

anachronist wrote:
Mon Apr 16, 2018 10:02 am
The "rule destroying" part seems to be the metal tube. Is there anything remaining that violates rules if you find a plastic tube that's the right diameter? Maybe substitute a nylon ball bearing for the steel ball?

Oof. I forgot to mention that the 'ball bearing' aforementioned is made of glass or plastic.

And no, unfortunately PVC pipes smaller than 20mm is impossible to find here in the Philippines. Third world problems, to be exact.

Thanks for the comment though. :)


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Re: *sigh* Really simple (but rule destroying) crushing sleeve design

Post by Alien Space Agency » Mon Apr 16, 2018 10:36 am

Batkiter wrote:
Sun Mar 20, 2011 12:29 pm

Chrushing Sleeve made by Batkiter is the solution! I used siliconhose for my sleeves
raketen_335.jpg
raketen_335.jpg

Regards Batkiter


And I still don't get how Germans get away with it 😂😂😂


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anachronist
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Re: *sigh* Really simple (but rule destroying) crushing sleeve design

Post by anachronist » Mon Apr 16, 2018 5:24 pm

Alien Space Agency wrote:
Mon Apr 16, 2018 10:32 am
And no, unfortunately PVC pipes smaller than 20mm is impossible to find here in the Philippines. Third world problems, to be exact.
Believe it or not, it's impossible to find here in California too, at least around where I live. I've been looking for schedule 20 pipe too... impossible.
-Alex



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Re: *sigh* Really simple (but rule destroying) crushing sleeve design

Post by Alien Space Agency » Mon Apr 16, 2018 8:59 pm

Then I went to the last resort to use metal.


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