3/19/2024 0 Comments Rc airfoil databaseThis shape increases the camber of the rear section of the airfoil moving the center of lift aft, giving more gentle stall characteristics. This is actually a semi-symmetrical airfoil, but it’s the shape most people think of when you say flat-bottom. Modified Flat Bottom – Flat from main spar to trailing edge. This shape provides a fairly high camber and results in high lift, but can be structurally weak and hard to effectively use on models. Semi-Symmetrical – Like the picture shown above, the top and bottom are similar but the airfoil has a slight camber.įlat Bottom – Very uncommon in RC models, airfoil bottom is flat from leading edge to trailing edge. All other airfoils are cambered and will produce aerodynamic lift due to their shape moving through the air. This creates an airfoil without Camber, that also produces zero lift at a zero angle of attack. Symmetrical – Top and bottom are exactly the same. The most common families or groupings of airfoils are: Mean or Camber Line - is the line defined by the vertical mid-point of the airfoil at every point along the chord.Ĭamber - while the calculation of Camber is more complicated than I want to get into, it can be thought of as an average measurement of the distance between the Mean and the Chord lines divided by the Chord. Leading Edge - the foremost edge of an airfoil section.Ĭhord (or Chord Line) - is a straight line connecting the leading and trailing edges of the airfoil and the value C represents its length. A reasonable airfoil section can be made, given just these parameters.Ĭommon airfoil design terms (simplified): These are maximum thickness, maximum camber, position of max thickness, position of max camber, and leading edge radius. Airfoil geometry can be summarized by just a few parameters. I chose to include it specifically because it is fairly basic and without any extra info that most people don’t need. The attached image was borrowed from a Paraglider Design Handbook. So here I will review the basics on airfoil design and selection, sticking to generalities that are easy to observe. Most modelers have to learn from experience, knowing that the subtleties between one airfoil and another close to the same shape will make very small differences.
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