Low-Wing Wind Tunnel Model (1927)

A dark, sleek wooden wind tunnel model of a single-engine aircraft resting on a textured roof surface. — Low-Wing Wind Tunnel Model (1927) · Donald A. Hall Estate Collection

Continuing his rigorous aerodynamic testing in 1927, Donald A. Hall Sr. photographed this sleek, low-wing aircraft model on the roof of the historic San Diego factory. These precision-carved models were essential for the wind tunnel testing that defined his engineering process.