Hall X-1 Prototype Executing Inverted Flight Test Maneuver (Circa 1928)

A high-altitude telephoto photograph of the Hall X-1 prototype flying completely inverted against a sky of light cirrus clouds. — Hall X-1 Prototype Executing Inverted Flight Test Maneuver (Circa 1928) · Donald A. Hall Estate Collection

A historic aeronautical action photograph recording the Hall X-1 prototype flying in a fully inverted attitude high above Southern California. Captured against light cirrus clouds with its landing gear pointing skyward, this extreme flight test proved the structural strength and inverted flight characteristics of Donald A. Hall Sr.'s tandem-wing design. The daring maneuver, also documented in Hall's personal 16mm motion picture film reels, provided empirical flight data demonstrating the control authority of his patented aerodynamic surfaces.