Winfoil - Model Aircraft Airfoil Plotting and Wing design software for windows. Design wings and tail surfaces for model aircraft. Plot wing sections and wing plans to any windows supported printer. On screen plotting of airfoils and wing designs. Automatic panelling for printing to normal sized printers. Airfoil polar plotting. Calculates wing area, aspect ratio, mean aerodyanic chord. Wing design wizard. Static stability graphs for tail area selection. Supports rib interpolation. Spar design facility. One free upgrade to next major version for registered users.