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typically the nose cone is filled with a parachute to the rocket arrives on the ground safely.
It streamlines the nose, so the rocket flies faster.
You use fins and a nose cone on a bottle rocket because the cone reduces the drag on the rocket, and the fins help stabilize the rocket.
"Rocket nose cone" pretty much says it all, I really don't think there is another suitable name.
Should be less than 1/5 length of main tube.
It streamlines the rocket and allows more speed.
It streamlines the nose.
nose cone
A perfect cone
nose cone
A streamlined plastic nose cone.