Ryan M-2 Welded Steel Fuselage Side Truss Blueprint (Circa 1926)

Original blueprint detailing the welded tubular steel fuselage side elevation and structural Warren truss layout of the Ryan M-2. — Ryan M-2 Welded Steel Fuselage Side Truss Blueprint (Circa 1926) · Donald A. Hall Estate Collection

A primary engineering blueprint documenting the fuselage framework of the Ryan M-2 monoplane. The technical drawing illustrates the welded steel-tube Warren truss side elevation, detailing station bay lengths, tubing diameters, diagonal strut geometry, cockpit bay openings, and tailpost attach fittings. Hall used these exact structural dimensions to design the elongated forward fuselage structure required to accommodate the heavy center-of-gravity fuel tanks of the Spirit of St. Louis.