Ryan NYP Head-On Optical Alignment and CG Calibration View (1927)

Head-on low-angle photograph of the Spirit of St. Louis parked level on Dutch Flats dirt apron. — Ryan NYP Head-On Optical Alignment and CG Calibration View (1927) · Donald A. Hall Estate Collection

An archival engineering photograph taken from a low ground perspective directly in front of the Spirit of St. Louis at Dutch Flats. The view captures the 46-foot high-wing monoplane in level stance, showing the Clark Y wing profile, the wide-track split-axle landing gear, and the Wright Whirlwind engine. Hall used these optical ground tests to confirm transverse symmetry and landing gear alignment.