SpainCub
Registered User
I guess we can call this demystifying the Riblett Airfoil.
So, what is the difference between all these airfoils anyways? Is there a magic Airfoil that can land you ever so slow, yet get you there on a dime?
Like all things in life, (in physics anyway) there is never something that comes for free, to gain something, you need to loose or expend something in return.
I have taken the liking of the Riblett GA 613.5, I heard so many great thing about it that I was all set to go out and build my wings on the airfoil, then it daunted on me, how does it really perform? So I decided at first that I would build a pair of wings and document that, and I might just do that (time, wife, health, and the old mighty dollar permitting) but I wanted to see a rough comparison how this works in computer models, so I went on and made sure that I had the best data possible to compare the Super Cub wing against Riblett or the USA 35B (unmodified) airfoils. I not going to make a full interpretation of the data, but I guess I was more surprised than most when it came to the results.
This is the data after 1000 iterations per variables, I am showing Re 2000000 and Re 8000000 for each of the foils, and I can send the data to anyone, if they chose to graph them themselves, but here is it. Showing Cl vs Alpha, then Cl/Cd then Cl/Cd vs Alpha:
Feedback welcomed,
So, what is the difference between all these airfoils anyways? Is there a magic Airfoil that can land you ever so slow, yet get you there on a dime?
Like all things in life, (in physics anyway) there is never something that comes for free, to gain something, you need to loose or expend something in return.
I have taken the liking of the Riblett GA 613.5, I heard so many great thing about it that I was all set to go out and build my wings on the airfoil, then it daunted on me, how does it really perform? So I decided at first that I would build a pair of wings and document that, and I might just do that (time, wife, health, and the old mighty dollar permitting) but I wanted to see a rough comparison how this works in computer models, so I went on and made sure that I had the best data possible to compare the Super Cub wing against Riblett or the USA 35B (unmodified) airfoils. I not going to make a full interpretation of the data, but I guess I was more surprised than most when it came to the results.
This is the data after 1000 iterations per variables, I am showing Re 2000000 and Re 8000000 for each of the foils, and I can send the data to anyone, if they chose to graph them themselves, but here is it. Showing Cl vs Alpha, then Cl/Cd then Cl/Cd vs Alpha:
Feedback welcomed,
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