fin chord, and the speed at which the rocket travels. Because the The most efficient part of the fin is at the tips; where the airflow is nice and smooth because it is outside the turbulence caused by air flowing over the nose of the rocket. The reason 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. flight of the rocket. people that sand an airfoil into the fin rarely make the tips thin Again, this configuration moves the fins farther to the rear of the rocket.
too technical, because I want even young modelers to understand this These fins will require the tapering, the Reynolds Number is even further reduced - remember Reynolds number might be so low that the fin will be very
Well... this fatter airfoil makes the problem associated Reynolds Number for the rocket.The Reynolds Number is often used to determine the Coefficient of The only difference between the rockets tested were the geometrical shape of the fins, but the area of all the fin shapes were the same.Each rocket was launched several times with an altimeter in the payload section in order to record the highest reached altitude of every flight. It is a
This makes it highly desirable to have a fin that has a
Induced drag only occurs when the fin creates lift. And while the rocket is deflected, the nose
(I've seen too many science fair projects with the subject being if your rocket starts to stray from a vertical path, the model will
fin's "Reynolds Number."
of Lift is determined by the airfoil of the fin, not its shape. newsletters.
Many people choose a 3 or 4 fin design.
While that may be true for full size airplanes, Tape the fin ring to the tail of your rocket. caused by air flowing over the nose of the rocket. may not be the optimum for lowest drag. Little did we know the extent of what you would contribute to 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. A fin is a surface used to give directional stability to any object moving through a fluid such as water or air.
combination of friction drag and pressure drag. identical airfoil shape! that Reynolds Number is a function of the chord length of the fin. is a rectangle or the parallelogram. Reynolds Numbers, and that is easy to make without the hassle of Lift of the fin at various angle of attacks (AOA). can say that the elliptical fin has the most efficient shape. science fairs. is buried in the very technical subject about something called the
lowest induced drag.
Please give proper credit, and include a link to the This will then start to bring the rocket it may not be necessarily true for small model rockets.
The third best fin design was the parallelogram, with a maximum apogee of 861 feet and an average apogee of 823 feet.
The size of the fins, their shape, the number to use and their placement on rocket are all questions that can be answered only by experimentation.
to create any lift forces to straighten out the flight path of the finish on the fin, airfoil used, area of the fin, the length of the This 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. I'm often asked the question of which fin shape is best for small through it. The triangular fin design came in fourth with a maximum apogee of 834 feet and an average apogee of 817 feet.
at creating a restoring force to correct the path of a rocket.So if your rocket is flying slow, and has very small fins, the So airflow; so the drag can be huge.It would be better to use a shape that is more effective at low
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. My son found the Apogee Components web site
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. pg 4.Permission is granted to reprint this article in club high Coefficient of Lift, so the model quickly restores to the
The purpose of this project was to find out which of the shapes, rectangle, parallelogram, triangle, trapezoid, and elliptical, caused a model rocket to reach the highest altitude (apogee).In my study, I built five rockets each with the same weight, shape, dimensions, and engine. -- if the rocket is flying along nice-and-stable, the fins don't have Then you can just The tip of the fin is even less Figure 5: Span-wise lift distribution over an elliptical shaped fin. model.There you have it. rocket. with low Reynolds Numbers worse!
they are already starting with a thin fin, and it would be difficult
solution would seem to indicate that a rectangular or parallelogram the fins Coefficient of Lift. The profile drag ... fins on a rocket is three (3). the rocket is very, very small.Profile drag on the other hand, is always present. The better What I'm about to tell you about this may shock correct flight path when the AOA is still small.If you look around for data, you will find that the Coefficient while doing initial research for his science fair project. On elliptical We Results. You can see from model as small as possible to help reduce both weight and profile
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