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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.

Starfighter on pad...

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dongfang
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Joined: Thu Jun 19, 2008 6:29 pm

Starfighter on pad...

Post by dongfang » Wed Nov 05, 2008 8:14 pm

Hi,

Here is my old Starfighter water rocket projcet, finally made flyable with bottle (5 * 0.5 l, about 1.8 l maybe) and all.

It launches pretty vertically and then pitches on to its back. And .... it has the same handling problem as the early jet fighters: Inertia coupling! When trying to roll it over, the nose will pitch up sharply, becuase the axis of gravity goes from somewhere below the tail to above the nose.

It glides like a dead fish, but at least it provides a kind of recovery system.

Next thing will be to make it go much higher, so I can have some time to learn flying it. I have a much fatter bottle in the works for it...

Regards
Soren
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Spaceman Spiff
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Re: Starfighter on pad...

Post by Spaceman Spiff » Wed Nov 05, 2008 11:58 pm

Good luck with the higher altitude flights. This is a really nice looking design. I want to see you get it going!


Spaceman Spiff
"What goes up, must come down"

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