What airfoil is used on the MQ-1B Predator's wing?
The MQ-1B uses three different airfoils: Drela GW-19, GW-25 and GW-27, created by Dr. Mark Drela (one of the creators of the XFOIL software) and proprietary to General Atomics.

The airfoils used on the MQ-1B (Drela GW-19, GW-25, GW-27, created by Dr. Mark Drela) are proprietary material of General Atomics. Dr. Drela personally stated on a hobbyist remote-control drone forum that a scale model should use an SD7032 wing (similar shape to a NACA 3510), while the full-scale MQ-1B airfoils &quot;...have LOTS of top surface camber.&quot;

&quot;Fixed-Wing UAV Airframe Design and Validation&quot;, Bachelor's Thesis of Timothy Brown, University of Queensland