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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.

Ideas for WR-car speed record

Discussions about water rocket powered cars, sleds or boats.
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RaZias
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Ideas for WR-car speed record

Post by RaZias » Fri Oct 22, 2010 11:43 am

I was imagining how it would be the speed record for a WR-car.

I know that 400 km/h is a football field per second :D , that is near the speed of X-12 (I think).

So adding the drag that would reduce the speed, altough a high speed is still possible.

Since is hard to find a very long non-busy road so the rocket could go from zero to zero and since launching a high-speed projectile in the ground could be dangerous I think it would be better to limit the rocket´s volume so it would run fast but not by to long.

That measure reminds of the Bugatti Veyron, its wheels allows it to stay at 400 km/h for 15 minutes...but for security the fuel tank has fuel only for 13 minutes at that speed.


It´s needless to say that any form of breaking mecanism is useless...no one has a reaction time to activate it before the rocket passes 40 meters at 200 km/h.

Conclusion:

- What is the minimal volume for a WR-car speed record ?
- What is the minimal distance accepted for a WR-car speed record ?
- How the speed record will be measured ? By a radar-speed-gun-toy ?


Research and Development is the soul of WR

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thampson
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Re: Ideas for WR-car speed record

Post by thampson » Sat Oct 23, 2010 8:49 am

Razius,
Parachutes work fine out the back of a water rocket car to slow down so you are not limited by the length of road you have available. There are many options to control the release, a timer, r/c release, pressure switch to release the parachute.

Your terminal velocity is right after the air pulse burnout , so you can have a pressure switch release the chute when you sense a minium pressure in the bottle for example. This way you can build a larger capacity car but still use a short road :)

-todd-


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U.S. Water Rockets1
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Re: Ideas for WR-car speed record

Post by U.S. Water Rockets1 » Sat Oct 23, 2010 10:18 pm

thampson wrote:Razius,
Parachutes work fine out the back of a water rocket car to slow down so you are not limited by the length of road you have available. There are many options to control the release, a timer, r/c release, pressure switch to release the parachute.

Your terminal velocity is right after the air pulse burnout , so you can have a pressure switch release the chute when you sense a minium pressure in the bottle for example. This way you can build a larger capacity car but still use a short road :)

-todd-
You could use an electronic release and trigger it with a light beam at the end of your run. That would be a really nice way to handle drag chute deploy.


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RaZias
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Re: Ideas for WR-car speed record

Post by RaZias » Tue Oct 26, 2010 11:48 am

I was thinking in using a PVC pipe as a rocket vessel for a WR-car since the weight doesn´t matter.
It would be surronded by wood to avoid the shatering of a blast.

The PVC pipe advantages:

- It would make a bigger nozzle (ex.: bigger than 30mm) the problem would be to use a big O-ring system.

- It allows the use of bigger pressure without demanding extra-reinforcement.


Research and Development is the soul of WR

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