Ryan NYP Engine Performance and Throttle Calibration Graph (Sheet 8) (1927)

Technical graph sheet 8 signed by Donald A. Hall plotting horsepower and fuel flow against engine RPM. — Ryan NYP Engine Performance and Throttle Calibration Graph (Sheet 8) (1927) · Donald A. Hall Estate Collection

An archival master technical graph signed in the lower margin by Donald A. Hall ("DAH"), titled "RYAN N.Y.P. AIRPLANE / BRAKE HORSE POWER VS. ENGINE R.P.M." The chart details engine power output and specific fuel consumption rates across rotational speeds from 1,000 to 1,900 RPM under varying operational conditions. These engine performance curves served to calibrate the cockpit tachometer and throttle quadrant for the historic flight.