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Airfield Performance Evaluation of an Advanced Propeller on the C-130H

The NP2000 is an advanced, eight-blade propeller with a more modern aerodynamic design than the four-blade 54H60 propeller currently used on the C-130H. Flight tests performed on a U.S. Air Force C-130H with NP2000 propellers installed in place of the original fourblade propellers were conducted using modern flight-test instrumentation and techniques to determine the effect of the new propellers on aircraft performance. The testing demonstrated greater net thrust at equivalent power settings. The increase in takeoff thrust resulted in greater low-speed acceleration and reduced four-engine takeoff distances. The new propellers exhibited different power transition characteristics and increased residual thrust at low power settings. Furthermore, the altered propeller slipstream effects changed the lift and drag characteristics of the airplane. The flight test results also revealed that greater takeoff thrust caused corresponding increases in minimum control speeds which negatively impacted critical field length in some cases. Landing speeds and distances were adversely affected by increased residual thrust at low power settings. The cumulative effect of the changes to airfield performance required a comprehensive update to the C-130H performance model.