Changes since the last version

New Features:

Export plots in DXF, EPS, or PICT formats.
Dynamic redraw: the plot redraws automatically as you enter or change the plot parameters.
Foam cutting templates completely reworked, now including entry/exit ramps and wire kerf compensation.
Spars are now truly notched into the airfoil, and can be rotated so the spar surface is flush with the airfoil surface.
Visually compare two airfoils.
More plotting options: turn chord and/or camber line on or off, and optionally invert the airfoil.
Preferences for default units to use.
Runs native on OS X, and back to OS 8.6.

Bug fixes:

If airfoil data files were moved, plot files could easily "lose" the data. Now the data will usually be found even if moved around.
Starting MacFoil by dragging a file on its icon made it run in "unregistered" mode.
Some airfoils didn't sheet correctly, and some could even hang the program. MacFoil is now more robust with small discrepancies in airfoil coordinates.
Up to 300 data points are now allowed in an airfoil.

New Bugs introduced:

I don't know yet, but I'm sure there are plenty. Please contact me and tell me about them.