You can draw on the screen and after print out your ribs and airfoils,
add spars, holes, L.E., T.E.
You can also draw template for foam cutting with station lines and washout.
English and metric units (see Enhancements).
TraCFoil use the DAT Files from UIUC Airfoil Coordinate Database and the files from my airfoils page, all are into the "Free Pack Airfoils".
System Requirements : Windows 95, 98, ME, NT4.0, 2000, XP, Vista, Seven
System Requirements : distribution Linux with Wine
System Requirements : MacBook C2D

You can draw ring frame from the "Tracé de couples elliptiques" Couples_v211.exe by Christophe Lauverjat