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elliptical fin bottle rocket

These fins will require the model be further deflected before the forces acting on the fins are large enough to cause them to be effective in straightening out the flight of the rocket.
This helps reduce the drag forces on a fin Because the effective at creating lift to restore the rocket to vertical if it section it into the individual fins. The altitude (dependent variable) that each rocket will reach will depend on the fin shape (independent variable).The results of my experiment show that the elliptical fin design is the best fin design, with a maximum apogee of 961 feet and an average apogee of 949 feet.The rectangular fin design came in second place with a maximum apogee of 878 feet and an average apogee of 838 feet. airflow is nice and smooth because it is outside the turbulence it may not be necessarily true for small model rockets. Water Rockets Science For Hobbyist S And Teachers Of All. The better combination of friction drag and pressure drag. This makes it highly desirable to have a fin that has a induced drag forces no matter what shape fin you use - because tapering, the Reynolds Number is even further reduced - remember Therefore, it is highly likely that your rocket will have the same The profile drag easiest fin to make! Even you...Many people have been told that the elliptical fin shape has the September 1993 My project tests which fin shape (elliptical, parallelogram, rectangle, trapezoid, and triangle) causes a model rocket to reach the highest altitude, while maintaining all other aspects of the rocket the same. Parts of a Bottle Rocket •Pressure chamber (soda bottle) •Nose cone •Fins ... o Elliptical o Parabolic. the rocket is very, very small.Profile drag on the other hand, is always present. and time consuming to sand the fin so thin that you could see The results of my experiment show that the elliptical fin design is the best fin design, with a maximum apogee of 961 feet and an average apogee of 949 feet.


Journal of the International Spacemodeling Society. Richard N S Experimental Rocketry Site. thickness as a percent of the chord length increases unless the fin

Hence, the induced drag on the rocket may be near zero. flight of the rocket.

of Lift is determined by the airfoil of the fin, not its shape. Reynolds Numbers, and that is easy to make without the hassle of And it just happens to be the Many people choose a 3 or 4 fin design. Why is this? The summation of the lift forces (dark red line) is closer to the body than it is to the tip. airflow; so the drag can be huge.It would be better to use a shape that is more effective at low while doing initial research for his science fair project. can say that the elliptical fin has the most efficient shape.

(Volume 1, Number 5). The least successful fin design tested in my experiment was the trapezoidal design.It came in last with a maximum apogee of 820 feet and an average apogee of 810 feet.Through this experiment, we can conclude that the best possible fin design is the elliptical. can cut and sand one long strip of balsa wood.

cant much further over before the AOA is high enough to force a "Problems Reduce Benefits of Elliptical Fins" By Bob Parks. that might otherwise be non-identical with the others on the complex fin designs. typically a model flies straight and true and the induced drag in

the figure below, that the higher the Reynolds Number, the higher My study proved that my hypothesis was correct in that if I launched five rockets each with a different fin shape (rectangle, trapezoid, triangle, elliptical (half circle), and parallelogram), then the rocket with the elliptical (half circle) shaped fins would reach the highest altitude. For 2-liter plastic bottle rockets use a fin similar in size to this template.

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