oriol
Well-Known Member
Hi!
I believe that it is recommended, to locate the horizontal stabilizer away from the wing slipstream. To achieve this, the vertical distance between the stabilizer and the wing, ought to be at least the wing's mean aerodynamic chord. Therefore the most practical place to locate the stab, both for a low wing and high wing, is the conventional arrrangement. But what happens if you go with a mid wing design, similar to the Rans Sakota? The stab is right behind the wing. This option is not that uncommon, and it has the advantage of avoiding the wing's stalled wake. Of course, airplane design is the art of finding a compromise between the pros and cons.
My question is how to size the stab bearing in mind its position? One option would be to copy from similar aircrafts. However Simons in his book Model aircraft aerodynamics, uses a coefficient named stab efficiency for calculating the neutral point, that I have not found in other books; see picture below.
Anyone has heard of that coefficient that Simons uses?
Any thoughts are welcome, happy new year!
Oriol
I believe that it is recommended, to locate the horizontal stabilizer away from the wing slipstream. To achieve this, the vertical distance between the stabilizer and the wing, ought to be at least the wing's mean aerodynamic chord. Therefore the most practical place to locate the stab, both for a low wing and high wing, is the conventional arrrangement. But what happens if you go with a mid wing design, similar to the Rans Sakota? The stab is right behind the wing. This option is not that uncommon, and it has the advantage of avoiding the wing's stalled wake. Of course, airplane design is the art of finding a compromise between the pros and cons.
My question is how to size the stab bearing in mind its position? One option would be to copy from similar aircrafts. However Simons in his book Model aircraft aerodynamics, uses a coefficient named stab efficiency for calculating the neutral point, that I have not found in other books; see picture below.
Anyone has heard of that coefficient that Simons uses?
Any thoughts are welcome, happy new year!
Oriol
