Ryan NYP Spirit of St. Louis Nose Cowling and Fuselage Lines Blueprint (1927)

Blueprint photostat of the Ryan NYP cowling lines and forward fuselage lofting contours drafted by Donald A. Hall Sr. — Ryan NYP Spirit of St. Louis Nose Cowling and Fuselage Lines Blueprint (1927) · Donald A. Hall Estate Collection

A critical aerodynamic blueprint photostat titled "Cowling Lines of Ryan NYP," engineered and drafted by Donald A. Hall Sr. in April 1927. The drawing details the station offsets, waterlines, and compound curvature templates for the hand-beaten aluminum nose cowling and spinner fabricated by Fred Rohr. Engineered to smoothly integrate the 220-horsepower Wright J-5C Whirlwind motor into the slab-sided fuselage while maximizing cooling airflow and minimizing parasitic drag, this blueprint captures the subtle aerodynamic fairing lines essential to the transatlantic aircraft's range efficiency.