examples of airfoils in nature and within various vehicles An airfoil is defined as any surface such as airplane aileron, rudder, wing, main or tail rotor blade, designed to obtain reaction from air from which it moves
Minix wing tip device promises 6% gain in fuel efficiency for airliners
Minix claims its design can save as much as 6% on an aircraft's energy costs. For a commercial Boeing 747, that equates to a saving of around 600,000 gallons of fuel - per year, per aircraft. Food for thought.