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As most of you know the heart of flight is an airfoil, with out it you have a missile that you can't slow down till impact.
The airfoil outlined in pink is a Riblett 35A8 15. The other is a USA 35B that is used on all of the fabric covered Pipers.
The USA 35B was a good airfoil for the day, and intended uses. It is a turbulent airfoil, meaning the airflow over the wing becomes turbulent shortly after leaving the nose of the airfoil, the turbulence starts at about 3 to 5% of the foil's cord. The cause of this is the blunt shape of nose of the airfoil. For those that don't know wing cord is the distance from the leading edge of the wing to the trailing edge of the wind.This turbulence causes higher drag for a given speed.
The Riblett 35A8 is a laminar flow airfoil, this means the airflow stays true to the foil shape longer. With this foil the airflow stays laminar to 35 to 40% of the foils cord. On this airfoil that would reduce the wings drag by 15 to 20% over the USA 35B.
I added a high lift camber to the airfoil to get the needed lift for good slow flight lift for short field performance. The stall characteristics should be better than most of the airfoils Cessna used on their aircraft built up to the 2000s.
Just for your knowledge none of the airfoils designed by NACA were intended to be used on an airplane. They were just test specimens to prove theory or changes to the airfoil.
The Riblett airfoils started life to be used on light aircraft. Harry corrected the errors on the NACA airfoils that he used as basis for his airfoil designs. Do his airfoils work? Yes the do and do very well. I know two of the fastest homebuilt aircraft are using Riblett airfoils. Mike isn't happy with his current world record... he wants to break it again by at least 15 miles per hour.
The airfoil outlined in pink is a Riblett 35A8 15. The other is a USA 35B that is used on all of the fabric covered Pipers.
The USA 35B was a good airfoil for the day, and intended uses. It is a turbulent airfoil, meaning the airflow over the wing becomes turbulent shortly after leaving the nose of the airfoil, the turbulence starts at about 3 to 5% of the foil's cord. The cause of this is the blunt shape of nose of the airfoil. For those that don't know wing cord is the distance from the leading edge of the wing to the trailing edge of the wind.This turbulence causes higher drag for a given speed.
The Riblett 35A8 is a laminar flow airfoil, this means the airflow stays true to the foil shape longer. With this foil the airflow stays laminar to 35 to 40% of the foils cord. On this airfoil that would reduce the wings drag by 15 to 20% over the USA 35B.
I added a high lift camber to the airfoil to get the needed lift for good slow flight lift for short field performance. The stall characteristics should be better than most of the airfoils Cessna used on their aircraft built up to the 2000s.
Just for your knowledge none of the airfoils designed by NACA were intended to be used on an airplane. They were just test specimens to prove theory or changes to the airfoil.
The Riblett airfoils started life to be used on light aircraft. Harry corrected the errors on the NACA airfoils that he used as basis for his airfoil designs. Do his airfoils work? Yes the do and do very well. I know two of the fastest homebuilt aircraft are using Riblett airfoils. Mike isn't happy with his current world record... he wants to break it again by at least 15 miles per hour.
Category Photography / Miscellaneous
Species Unspecified / Any
Size 1280 x 960px
File Size 89.4 kB
Sometimes turbulence on the wing is a desired feature. The Boeings all had these little off set fin things mid wing in front of the ailerons... go ahead and ask how many times I ripped my pants on these and left marks on my butt. Then (actually found by accident) the Lear leading edge has button head screws spaced out all along the leading edge. The story goes, during the initial trials, these were used as temp fasteners. After the trials, they replaced them all with countersunk fasteners and the airplane flew terribly so the researched it and made button heads as part of the design. This is also why, if you remove the leading edge for something, the airplane HAS TO HAVE a check flight using a specially trained crew.
V.
V.
Yes the use of vortex generators is common... especially with NACA airfoils. For some odd reason many of the airplane manufacturers think they have to use an sailplane airfoil on their large designs... Airfoils intended for sailplanes are not the best choice for a powered aircraft. The flight needs and dynamics are very different.
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