Master Aerodynamic Lofting and Fuselage Lines Drawing of the Spirit of St. Louis (1927)

Original master aerodynamic lofting lines drawing on drafting vellum signed Model NYP April 1927 Designed by D.A. Hall. — Master Aerodynamic Lofting and Fuselage Lines Drawing of the Spirit of St. Louis (1927) · Donald A. Hall Estate Collection

The supreme engineering artifact of the Donald A. Hall Estate Collection: the original master lofting and aerodynamic lines drawing on drafting vellum, hand-inscribed and signed in the lower corner: "Model N.Y.P. / April 1927 / Designed by D.A. Hall". This historic document depicts the precise cross-sectional station curves, longitudinal waterlines, and fairing profiles developed by Hall to streamline the enclosed fuselage of the Spirit of St. Louis around its massive 425-gallon main fuel tank. Serving as the primary empirical definition of the Ryan NYP, this drawing provides irrefutable physical proof of Hall's sole authorship of the transatlantic aircraft.