![]() ![]() These wings also utilized the short nose rib sections, forward of the main spar, between tha main ribs. The Cub type wing had the concave type false spar and the nose of each rib had the individual brace members. The Cruiser wing panels did not have the short nose rib sections between each main rib either The differences here were that the Cruiser wing had the "S" or "Sloped" type of false spar and had a stamped nose plate rivited into the leading edge or nose section of each rib, rather than the individual truss type bracing. The Cub wing was used on the J3, PA-11, PA-18, PA-25 and all the short wingers. The NACA 6-series of airfoils is widely employed for aircraft wings and wind turbine blades (119) and it. The Cruiser wing was used on the J4, J5, PA-12 and PA-14. The study presented in this chapter is carried out considering a NACA 63 1 412 airfoil. In my weekend siminars, I divide the wings into two classes, the "Cruiser Wing" and the "Cub Wing". All the ribs were similar from the J2 through the PA-25 Pawnee. Thus the terminology "USA 35B Modified" was the typical description of the Piper rib and the chord was 63 inches. "All fabric Piper ribs employed one airfoil design, the USA 35B, but were modified by increasing the upper coordinates by 4%. Quoting from the Sept/Oct 2005 Cub Clues newsletter A Study of Piper Ribs Clyde says in part: Use the Show Coordinates button to export the resulting coordinate points to a spreadsheet or text editor. The chord can be varied and the trailing edge either made sharp or blunt. Let's go to "the" source, Clyde Smith, Jr. The calculator below can be used to plot and extract airfoil coordinates for any NACA 4-series airfoil. OK 8 posts of people giving their best guess. ![]()
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