Hi Hamish, yup like Burr says try the Conic command for a traditional airfoil curve.

It's available under Draw curve > More > Conic, and it lets you draw 3 points to make a shoulder bracket of 2 intersecting lines, and then either pick a point for the curve to go through or enter a "rho" value.

Some more information here:
http://moi3d.com/2.0/docs/moi_command_reference2.htm#conic

- Michael