Ryan NYP Aerodynamic Performance Graph: Velocity vs. Horsepower Required (Sheet 2) (1927)

Technical engineering graph sheet 2 plotting velocity versus horsepower required across varying weights. — Ryan NYP Aerodynamic Performance Graph: Velocity vs. Horsepower Required (Sheet 2) (1927) · Donald A. Hall Estate Collection

An archival master engineering graph (designated Sheet 2) titled "RYAN N.Y.P. AIRPLANE" from Donald A. Hall Sr.'s technical design files. The chart plots indicated airspeed in miles per hour (from 40 to 140 mph) against engine horsepower required across multiple gross weight configurations ranging from full overload to empty weight. These aerodynamic curves established the power requirements for the Clark Y wing and were subsequently incorporated into Hall's authoritative NACA Technical Note 257.