Ryan NYP Climbing Right Bank Flight Trial Over Dutch Flats (May 1927)

Action photograph of the Spirit of St. Louis in a climbing right bank over Dutch Flats showing underwing registration. — Ryan NYP Climbing Right Bank Flight Trial Over Dutch Flats (May 1927) · Donald A. Hall Estate Collection

An archival engineering action photograph recording the Ryan NYP Spirit of St. Louis executing a right-hand climbing turn over Dutch Flats, San Diego. Captured from ground level, the view highlights the wide 46-foot wingspan, the high-lift Clark Y wing profile, and the bold black registration "N-X-211" stenciled across the wing underside. Chief Engineer Donald A. Hall Sr. utilized these flight trials to confirm lateral control response and aileron effectiveness under operating aerodynamic loads.