Ryan NYP "Spirit of St. Louis" Welded Steel Aileron Frame Inspection (View 2) (1927)

Second vertical engineering view of uncovered welded steel aileron frame showing hinge mounts and torque horn. — Ryan NYP "Spirit of St. Louis" Welded Steel Aileron Frame Inspection (View 2) (1927) · Donald A. Hall Estate Collection

A secondary archival engineering study detailing the uncovered steel-tube aileron frame for the Spirit of St. Louis. Photographed against the wooden shop wall, this perspective highlights the hinge attachment collars, torque-tube horn assembly, and clean oxy-acetylene weld joints fabricated by Ryan metalworkers under Hall's supervision prior to fabric covering and doping.