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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.

Ask not...

Post photos and videos of your rocket, launches and your onboard video or photos here. A wide variety of formats supported including attachments and embedded youtube.
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dongfang
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Ask not...

Post by dongfang » Sun Dec 07, 2008 12:09 pm

... what water rocketry can do for you. Ask what you can do for water rocketry.

My achievement this weekend :)

Regards
Soren
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chriswaterrockets
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Re: Ask not...

Post by chriswaterrockets » Sun Dec 07, 2008 1:11 pm

Wow :D :D !! Well done... :mrgreen:
Did that rocket actually go through the tiles?
I still have a rocket sittin' on neighbour's roof too!!! Don't know if he even knows...



monboy10
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Re: Ask not...

Post by monboy10 » Sun Dec 07, 2008 2:42 pm

NICE :D



dongfang
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Re: Ask not...

Post by dongfang » Sun Dec 07, 2008 5:57 pm

Hi,

Ooooh yeah it broke one tile and went through. There was a piece of 63 mm PVC pipe in front of the rocket, as weight (probably not even 100 grams). That must have been hard enough to smash the tile.

But as you can see, the roof is a bit aged. With holes in it too, now. Obviously a pre space age, non-rocketproof roof.

Regards
Soren



dongfang
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Re: Ask not...

Post by dongfang » Sun Dec 07, 2008 6:48 pm

Here are a few more pics of the flight. I can't wait to get the movie out of the onboard cam - as soon as I get the USB connector soldered back on, or get a card reader.

Now, does anyone have an idea for something else I can use for a weight in a rocket? In simulations, and in reality too as far as I can see, adding weight to a rocket improves (peak altitude) performance in some cases. There will simply be more kinetic energy to overcome wind resistance.

Ideally, one of course just adds weight by using a stronger pressure vessel. But I have only the PET bottles now, and I have to get away from flying hammers.

I want my weight:
- either soft (softer than a water tank, which can still pack quite a punch), or located behind a PET bottle crumble zone (maybe 1/3 down the rocket)
- nice and dense, not bulky
- if located around the sides of the pressure vessel, then it should not fragment in an explosion

Any ideas? Other than wrapping the rocket with 13 rolls of packing tape?

Regards
Soren
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WRA2
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Re: Ask not...

Post by WRA2 » Sun Dec 07, 2008 7:56 pm

Nice little adventure you had there. Looking forward to seeing the onboard video.

Congratulations on making the 4,000th post. 8) 8) 8) 8) :D :D :D


Lisa Walker,
:WRA2: Forum Administrator. :WRA2:
:WRA2:The Water Rocket Achievement World Record Association :WRA2:

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Alex
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Re: Ask not...

Post by Alex » Sun Dec 07, 2008 11:05 pm

hahaha...


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

air.command
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Re: Ask not...

Post by air.command » Mon Dec 08, 2008 4:10 am

dongfang wrote:Here are a few more pics of the flight. I can't wait to get the movie out of the onboard cam - as soon as I get the USB connector soldered back on, or get a card reader.

Now, does anyone have an idea for something else I can use for a weight in a rocket? In simulations, and in reality too as far as I can see, adding weight to a rocket improves (peak altitude) performance in some cases. There will simply be more kinetic energy to overcome wind resistance.

Ideally, one of course just adds weight by using a stronger pressure vessel. But I have only the PET bottles now, and I have to get away from flying hammers.

I want my weight:
- either soft (softer than a water tank, which can still pack quite a punch), or located behind a PET bottle crumble zone (maybe 1/3 down the rocket)
- nice and dense, not bulky
- if located around the sides of the pressure vessel, then it should not fragment in an explosion

Any ideas? Other than wrapping the rocket with 13 rolls of packing tape?

Regards
Soren
Hi Soren,

Sorry to hear about the roof, but the rocket looks great. Something you may want to try as a weight is a zip-lock plastic bag with water in it. You can easily change the amount of water in it depending on your needs. It will easily conform to the space you have available, whether in a crumple zone, or in between bottles. If the rocket goes boom, you only need to worry about water spray and a torn plastic bag.


http://www.AirCommandRockets.com

dongfang
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Re: Ask not...

Post by dongfang » Mon Dec 08, 2008 7:41 am

DARN, I can't find the movie on the SD card of the camera.

I will have to fly that monster again .....

(It actually flew pretty well, and came quite high for the lousy 6 bar of pressure I had in it. Next time, it will set a personal altitude record, I think).

Regards
Soren



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rockets-in-brighton
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Re: Ask not...

Post by rockets-in-brighton » Mon Dec 08, 2008 8:55 am

Soren:

Is there any reason you don't like modelling clay? (plasticine) Seems to tick all your boxes...


Cheers
Steve
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dongfang
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Re: Ask not...

Post by dongfang » Mon Dec 08, 2008 9:03 am

Hi,

I don't know what it is :)

But if it some plastic (the adjective, not the noun) stuff, how would you attach it to the rocket? Roll it into strips and tape them on?

Is it natural clay, or full of solvents?

Regards
Soren



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rockets-in-brighton
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Re: Ask not...

Post by rockets-in-brighton » Mon Dec 08, 2008 2:52 pm

dongfang wrote:Hi,

I don't know what it is :)

But if it some plastic (the adjective, not the noun) stuff, how would you attach it to the rocket? Roll it into strips and tape them on?

Is it natural clay, or full of solvents?
It is the brand name of a type of non-setting artificial modelling clay common in the UK/Commonwealth, I don't know if you'll recognise the description here <http://fr.wikipedia.org/wiki/P%C3%A2te_%C3%A0_modeler>
or English: <http://en.wikipedia.org/wiki/Plasticine>

Maybe that will remind you of a similar local brand. Very useful stuff.


Cheers
Steve
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WEB: http://groups.google.co.uk/group/rockets-in-brighton

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Alex
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Re: Ask not...

Post by Alex » Mon Dec 08, 2008 4:00 pm

dongfang wrote:DARN, I can't find the movie on the SD card of the camera.

I will have to fly that monster again .....

(It actually flew pretty well, and came quite high for the lousy 6 bar of pressure I had in it. Next time, it will set a personal altitude record, I think).

Regards
Soren
Sounds like a plan :)


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

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Bonami
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Re: Ask not...

Post by Bonami » Wed Dec 10, 2008 12:15 am

That's the most awesome water rocket crash I ever have seen!

Sorry about the rocket and roof.



JohnC
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Re: Ask not...

Post by JohnC » Sun Dec 21, 2008 11:50 pm

THat's one of the best rocket pictures (sticking in the roof). That's the problem with launching, finding a safe place to do it. I used to launch in my driveway until one of my rockets almost crashed into the neighbor's Lexus. Now I need to find an open field close by ...



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