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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.

No 5 gallon class?

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motorcyclepilot
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No 5 gallon class?

Post by motorcyclepilot » Sat Oct 03, 2015 8:15 pm

We've launched the bare bottle to about 100' and are wondering how it will do with fins and a nose cone. Right now it weighs over 2800 grams. This is for fun only and we are not expecting to set any records. The nose cone is paper mache that we made on a styrofoam core. The fuselage is gift wrap taped to a wooden frame and then shrunk with water and then lacquer.

The launcher is visible on the wall in the upper right corner of the photo. It is an o-ring launch tube with Clark release.
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bugwubber
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Re: No 5 gallon class?

Post by bugwubber » Mon Oct 05, 2015 8:54 am

LOL that's awesome! I found a 3 gallon bottle that is round with no handle indent. Hope to launch it one day...

Any launch video?


Bugwubber

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motorcyclepilot
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Re: No 5 gallon class?

Post by motorcyclepilot » Mon Oct 05, 2015 9:39 am

There will be. Working on the deployment mechanism. Plan on using a ladies push-button umbrella shaft for the ejection force. Hopefully we will be ready to launch by next weekend.



addstogether
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Re: No 5 gallon class?

Post by addstogether » Sat Dec 26, 2015 5:39 pm

Hows the rocket going? Do you have any footage of the launch?



motorcyclepilot
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Re: No 5 gallon class?

Post by motorcyclepilot » Thu Dec 31, 2015 11:09 am

Just finished the altimeter/deployment electronics package a few weeks ago. Still need to finish the deployment mechanism. It's been c-o-l-d and rainy. Looks like a late winter/early spring launch. I will definitely post video/launch data.

Thanks for your interest!



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addstogether2
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Re: No 5 gallon class?

Post by addstogether2 » Sat May 21, 2016 7:38 pm

Just following up on your launch? How did it go or are you still working on the deployment mech.

Al


Life is like riding a bicycle. To keep your balance you must keep moving.
"Albert Einstein"

motorcyclepilot
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Re: No 5 gallon class?

Post by motorcyclepilot » Wed Jun 22, 2016 11:03 pm

Sorry for the delays. Our fins did not stick well with PL. Two of them came off. Today we re-attached them with West System epoxy. Also having problems skinning the fuselage frame. Tried cling-wrap but it curved in excessively. Gift wrap worked okay, but was easily damaged.

This is going to be a HEAVY rocket for now. The fuselage weighs more than the pressure vessel.

The parachute and electronics are complete(USWR Launchpad Altimeter). We still need to build the deployment mechanism.

EDIT:

Just re-weighed the components. The wood fuselage frame is over 1200 grams. Just realized I have some large pieces of styrofoam I can make into a fuselage section and nose cone for a huge weight savings.



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addstogether2
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Re: No 5 gallon class?

Post by addstogether2 » Mon Jun 27, 2016 11:41 pm

Styrofoam would be excellent! Would you still have to weight the nose section for stability?


Life is like riding a bicycle. To keep your balance you must keep moving.
"Albert Einstein"

motorcyclepilot
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Re: No 5 gallon class?

Post by motorcyclepilot » Tue Jun 28, 2016 1:04 pm

addstogether2 wrote:Styrofoam would be excellent! Would you still have to weight the nose section for stability?
Our launcher for that rocket has a launch tube and the HUGE fins should keep it upright. We shall see...



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addstogether2
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Re: No 5 gallon class?

Post by addstogether2 » Tue Jun 28, 2016 11:36 pm

Cool, Please keep us all informed how it goes and any video / pics of the launch

Al


Life is like riding a bicycle. To keep your balance you must keep moving.
"Albert Einstein"

motorcyclepilot
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Re: No 5 gallon class?

Post by motorcyclepilot » Thu Jul 07, 2016 1:35 am

Sorry I've been dragging my feet on this one. I just couldn't live with the fuselage frame that weighed over 1200 grams! The new fuselage is a hollow-core styrofoam cylinder with a wall thickness of about 1 centimeter and weighs a little over 100 grams. The nose cone weighs a little over 300 grams but I plan on hollowing it out as well. The rocket is about 69 inches tall. My goal for this project is to get the entire rocket in launch condition under 1500 grams.
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addstogether2
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Re: No 5 gallon class?

Post by addstogether2 » Thu Jul 07, 2016 8:42 am

It is definitely coming along. Are you going to paint it?

1 cm that's quite thin, will it handle the re entry?

Al


Life is like riding a bicycle. To keep your balance you must keep moving.
"Albert Einstein"

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Alien Space Agency
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Re: No 5 gallon class?

Post by Alien Space Agency » Thu Jul 14, 2016 8:24 pm

And how many astronauts can fit inside the capsule?


Nothing can stop a curious mind from inventing- Anonymous

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addstogether2
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Re: No 5 gallon class?

Post by addstogether2 » Sun Aug 14, 2016 6:23 pm

With the launcher what is the hold down method?

I just came into some bottles similar.

Al


Life is like riding a bicycle. To keep your balance you must keep moving.
"Albert Einstein"

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China_WaterRocket
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Re: No 5 gallon class?

Post by China_WaterRocket » Fri Mar 03, 2017 12:46 am

Good ,Happy.
Try it.

My picture.
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I come from China, do not understand English, your information I use the translation software to view. I like water rockets, technology is the same, I hope we can become friends.

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