1. The Wortmann FX 63-137 airfoil section was chosen for the expected Reynolds number range of 10' to lo 6. This airfoil section has been used previously for low speed man-powered airplanes." Reference
2. The horizontal and vertical t a i l surfaces generally operate at low values of CL; therefore, their induced drag contribution i s small. Utilizing a thin, low drag airfoil section, NACA 0008-34, an approximate value for the zerolift t a i l drag coefficient is given by Ref. 19.