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For a typical water rocket, it doesn't matter much. Three squares or triangles, about four to ten square inches in size, 120 degrees apart, as far below the center of mass (balance point) as you can put them, will do well enough. Use any stiff plastic and a lot of Duct Tape. Try to glue them on as close to vertical as you can - or if you want the rocket to spin, try tilting them all the same way a couple degrees. (A small amount of spin may help stability; a lot will cut down your altitude greatly). A water rocket isn't going to be very stable at the best of times, since the water tends to slosh around, and the fins can't do much about that. (A little bubble bath in the water, shaken up to get some foam, may help.)

yah but whatever else u wnt man(:

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13y ago

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