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Usually you would put the fins at the bottom of the body tube and evenly spaced around it. The rocket may be stable even though the fins were a little higher on the tube; it depends
http://wiki.answers.com/Q/Where_do_the_fins_go_on_...
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They tend to slow it down, and if they are not perfectly parallel to the main tube. and. to each other, can make flight unstable. In fins, small is better.
http://wiki.answers.com/Q/What_are_the_effects_of_...
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an elliptical fin works the best because it is stable, fast, and they cut through the air allowing it to go higher, faster and straighter.
http://wiki.answers.com/Q/What_fins_work_best_for_...
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Almost any shape will work, although delta shaped is best. Far more important is that the fins should be exactly parallel to the main tube.
http://wiki.answers.com/Q/What_shape_of_fins_shoul...
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