R8893

My Feedback: (20)

CarPainter,
I have been using a NACA 2315 on my last two scratch builds. It looks to me like the lift and drag coefficients are minimally different from the comparable 2400 series airfoils. But on the 2312 and 2315 the high and low points of the airfoil are both at 30% of cord. This makes for a very simple and efficient way to arrange the spars to build the classic model "D" tube wing. The high and low points of the 2400 series are not at the same % of cord. I can provide the coordinates of these airfoils for manual plotting or entering a CAD program to let the program curve fit. Photo of my Val with 2315 root airfoil. Just less than 2 degrees wing incidence. 14.3#, 7.8 sq ft wing area, 81" span. Only two flights since finishing in December, but it looks like it will be a very good model with excellent slow flight capability.
Chuck