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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.

Reefing parachutes

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retrotec29
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Reefing parachutes

Post by retrotec29 » Fri Dec 22, 2017 12:48 pm

Due to some interesting geography of my launch site I am forced to get a little creative on recovery. Being in a valley past a certain altitude the recovery becomes less predictable. Reefing the chute so it inflates at a lower altitude seems like a good choice. Reefing uses a ring sliding down the chute lines to delay inflation. Simple in design but kind of complex to master. Ring weight, line friction and chute shape are all factors. As I read the different class rules and follow the forum it appears descent rate has become a fall back in validating some attempts. An exception is class D which only requires a peak altimeter. As we go higher and higher controlling the decent rate may become more of an issue. I just wanted to put it out there for discussion.


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Re: Reefing parachutes

Post by WRA2 » Fri Dec 22, 2017 4:42 pm

Just to clarify in case anyone is wondering. The descent rate applies to the speed at which the recovered rocket touches the ground. Main/drogue, reefing systems or even deploying a parachute at a low altitude on the way down are all acceptable if the speed at touchdown is within the specification.


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retrotec29
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Re: Reefing parachutes

Post by retrotec29 » Fri Dec 22, 2017 6:57 pm

Cool. Thanks for clarifying.


No matter where you go, there you are. Buckaroo Banzai

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