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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.

The Texas Express

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bugwubber
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The Texas Express

Post by bugwubber » Mon Apr 07, 2014 1:17 pm

Here's some videos from our newest rocket that we built the 30mm (widemouth) launcher for.

The pressure vessel is a 1 liter widemouth bottle with a 30mm nozzle.

The camera for these launches is a SpyGear Panosphere.

The recovery system is the self ejecting water ballast with a non-ballistic return. (It falls sideways after the ballast water is ejected)

[youtube][/youtube]

Our flights were hitting about 250ft


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Re: The Texas Express

Post by bugwubber » Mon Apr 07, 2014 1:19 pm

CAM01003.jpg
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Re: The Texas Express

Post by Water Rocket Expert » Mon Apr 07, 2014 2:16 pm

It is easy to get a one liter rocket to go 250'

How much pressure was that. Overall it looked awesome. Good recovery too!

Why was the camera tiling so much? It kept going back and forth and pointing in all directions.


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Re: The Texas Express

Post by bugwubber » Mon Apr 07, 2014 3:43 pm

Water Rocket Expert wrote:I'm sorry but I don't believe a 1 liter bottle can go 250'. Isn't that a bit high?
I think that is the most flattering thing anyone has ever said to me. Thanks!

That 252ft altimeter graph that I posted earlier was this rocket but without the camera on board. This flight had both altimeter and camera but I didn't secure the altimeter very well so it didn't record the flight. The camera is very lightweight so I don't expect much impact there.
Water Rocket Expert wrote: How much pressure was that. Overall it looked awesome. Good recovery too!
100psi. Thanks!
Water Rocket Expert wrote: Why was the camera tiling so much? It kept going back and forth and pointing in all directions.
That movement is actually post flight. The camera records a 360degree circle video. The software converts it to a normal video window that you can manipulate.


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Re: The Texas Express

Post by bugwubber » Tue Apr 08, 2014 6:48 pm

Here's a freeze frame and the ground launch video
912802.jpg
[youtube][/youtube]
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Re: The Texas Express

Post by Water Rocket Expert » Tue Apr 08, 2014 9:36 pm

That looks more a 2 liter bottle to me.

Did you read my previous comment carefully? Read it again.


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Re: The Texas Express

Post by Water Rocket Expert » Tue Apr 08, 2014 9:40 pm

I could be wrong but it sounds like the kid at the end who said, "awesome, lets do it again" was from Texas because of his southern accent.


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Re: The Texas Express

Post by bugwubber » Tue Apr 08, 2014 11:36 pm

Water Rocket Expert wrote:I could be wrong but it sounds like the kid at the end who said, "awesome, lets do it again" was from Texas because of his southern accent.
Yep when he was younger he sounded exactly like you'd expect Tom Sawyer to sound like.

That was his very first observation of a water rocket launch.


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Re: The Texas Express

Post by bugwubber » Wed Apr 09, 2014 12:25 am

Water Rocket Expert wrote:That looks more a 2 liter bottle to me.

Did you read my previous comment carefully? Read it again.

I did. And that a fair question considering I didn't post a picture with its label on.

So I have this instead for you...
[youtube][/youtube]
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Re: The Texas Express

Post by bugwubber » Wed Apr 09, 2014 10:43 am

Water Rocket Expert wrote:It is easy to get a one liter rocket to go 250'
...

Change your mind? I agree, it was easy!

I ran a bunch of sims, looks like I could possibly hit 300 if I try harder.


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