Elias XNBS-3 Night Bomber Wooden Wind-Tunnel Model Front View (Circa 1923)

Front three-quarter perspective of the carved wooden Elias XNBS-3 night bomber model showing twin Liberty engines and biplane wings. — Elias XNBS-3 Night Bomber Wooden Wind-Tunnel Model Front View (Circa 1923) · Donald A. Hall Estate Collection

Detailed front three-quarter view of the finely finished wooden wind-tunnel model of the Elias XNBS-3 night bombardment biplane, engineered by G. Elias & Bro. in Buffalo, New York, where Donald A. Hall Sr. served as a structural draftsman and engineer. The model showcases the twin Liberty L-12 engine nacelles mounted between two-bay biplane wings, two-blade tractor propellers, interplane struts, and individual main landing gear units beneath each engine. This technical artifact illustrates Hall's foundational experience calculating structural beam shear and engine-out aerodynamics on heavy military bombers prior to his West Coast career.