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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.


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Entering Science Buskers Festival With Water Rocket Car

Discussions about water rocket powered cars, sleds or boats.
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thomashoi
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Joined: Wed Aug 13, 2008 6:52 am

Entering Science Buskers Festival With Water Rocket Car

Post by thomashoi » Wed Aug 25, 2010 11:48 am

I have recently made it to the Science buskers busking round after an audition and will be using my water rocket car made from Lego bricks to demonstrate the power of water rocket and how it works.

You can view some of the pictures for the Science buskers Water Rocket Car here.

The car is dragster like with long body and the attached PET bottle is 500ml. I have pressurized
up to 80psi and it moves off fast. I also add some water and pressurized to 40psi and this time,
i can see the acceleration really fast but when I increased to 50psi, the car flipped instantly.

I believe the car is still not quite stable yet and I'm wondering what I could do to make the car more
stable so that i can test higher pressure with more water.


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thampson
Current WRA2 Dragster Speed & Distance Record Holder
Current WRA2 Dragster Speed & Distance Record Holder
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Re: Entering Science Buskers Festival With Water Rocket Car

Post by thampson » Sat Aug 28, 2010 2:01 pm

If its flipping over widen the front and rear axle a little, you will know when you have it wide enough as the car will spin rather than flip over. At that stage add a a rear wing to provide downforce over the rear wheels, this will stop the spinning.

Take a look at our website, there is lots of information about water rocket cars and the things we have tried to get a stable water rocket car.

http://wrocket.hampson.net.au

Good luck at the competition

-todd-


HHWRSA
Hornsby Heights Water Rocket Space Agency
http://wrocket.hampson.net.au

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U.S. Water Rockets1
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Joined: Sat Feb 03, 2007 3:24 pm

Re: Entering Science Buskers Festival With Water Rocket Car

Post by U.S. Water Rockets1 » Sat Aug 28, 2010 10:02 pm

thomashoi wrote:I have recently made it to the Science buskers busking round after an audition and will be using my water rocket car made from Lego bricks to demonstrate the power of water rocket and how it works.

You can view some of the pictures for the Science buskers Water Rocket Car here.

The car is dragster like with long body and the attached PET bottle is 500ml. I have pressurized
up to 80psi and it moves off fast. I also add some water and pressurized to 40psi and this time,
i can see the acceleration really fast but when I increased to 50psi, the car flipped instantly.

I believe the car is still not quite stable yet and I'm wondering what I could do to make the car more
stable so that i can test higher pressure with more water.
You should (if allowed) glue your legos together with some CA glue. The joints in legos add a lot of flex to the structure and this makes the entire structure weak. Even if your rocket car is properly shaped, the legos will be much less rigid and this will lead to potential failure.


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