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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.

Rules Question

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Mac
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Rules Question

Post by Mac » Mon Sep 14, 2009 1:49 pm

Our team would like to use CO2 as the compressed air source for a number of reasons, safety being one of them, but wonder if it is prohibited under the rules.

I cannot find a specific prohibition to the use of carbon dioxide. The rules appear to say only that the gas must be "atmospheric". CO2 is an atmospheric gas but do the rules mean that the gas must only be compressed air?

Mac



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RaZias
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Re: Rules Question

Post by RaZias » Mon Sep 14, 2009 2:20 pm

Mac wrote:Our team would like to use CO2 as the compressed air source for a number of reasons, safety being one of them, but wonder if it is prohibited under the rules.

I cannot find a specific prohibition to the use of carbon dioxide. The rules appear to say only that the gas must be "atmospheric". CO2 is an atmospheric gas but do the rules mean that the gas must only be compressed air?

Mac
First it avoids the use of gas tanks (I think CO2 is stored like the O2 in scuba tanks) that are dangerous.
That way it´s only admited air from compressors (not scuba tanks) in WR competition.

Second CO2 is in a phased-state, it means that´s partial liquid and partial gasous, so when the gas is ejected and reduces the pressure therefore the liquid may turn to gas and starts to be ejected also.

Since there is CO2 liquid there it´s no longer a water-rocket but a water+C02 liquid rocket.
And this is a competition for water-rocket only.

NO ROCKET DOPING LOL


Research and Development is the soul of WR

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WRA2
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Re: Rules Question

Post by WRA2 » Mon Sep 14, 2009 3:42 pm

RaZias wrote:
Mac wrote:Our team would like to use CO2 as the compressed air source for a number of reasons, safety being one of them, but wonder if it is prohibited under the rules.

I cannot find a specific prohibition to the use of carbon dioxide. The rules appear to say only that the gas must be "atmospheric". CO2 is an atmospheric gas but do the rules mean that the gas must only be compressed air?

Mac
First it avoids the use of gas tanks (I think CO2 is stored like the O2 in scuba tanks) that are dangerous.
That way it´s only admited air from compressors (not scuba tanks) in WR competition.

Second CO2 is in a phased-state, it means that´s partial liquid and partial gasous, so when the gas is ejected and reduces the pressure therefore the liquid may turn to gas and starts to be ejected also.

Since there is CO2 liquid there it´s no longer a water-rocket but a water+C02 liquid rocket.
And this is a competition for water-rocket only.

NO ROCKET DOPING LOL
Compressed air in tanks is allowed under the current competition rules.

http://www.wra2.org/WRA2_Class_A_Rules.php

See section II for the special rules regarding bottled air.
RaZias wrote:NO ROCKET DOPING LOL
:lol: :lol: :lol: :roll:


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

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