Airborne Tactical Control System Propulsion Study - Noise, Vibration, and Radar Characteristics Report
UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT
Pagination or Media Count:
A brief research and analytical investigation was conducted to determine the impact of powerplant radar, noise, and vibration characteristics on propulsion system selection and design for the airborne tactical control mission. Turboprop and turbofan noise, vibration, and radar cross section characteristics were compared on the basis of data available in the literature and data obtained by simplified analytic methods. Aircraft noise and vibration levels attributable to the powerplant were compared with criteria established for crew comfort for mission durations of the length required for the airborne tactical control mission. Radar cross sections for turboprop and turbofan powerplants were compared as to their influence on the relative detection range of the aircraft. The effects of propeller modulation of the reflected radar signal and the detection of this signal using moving-target-indication MTI radar were considered. It was found that the reduction of powerplant noise levels and radar cross sections warrant significant attention in the selection and design of the powerplant. The conventional turboprop installation presents a significant vibration problem because of blade passing in close proximity to the cabin. Propeller modulation of radar signals greatly increases the range at which the aircraft can be detected. It was concluded that unconventional turboprop designs warrant serious consideration in particular, a shrouded turboprop may present an attractive alternative.
- Patrol and Reconnaissance Aircraft
- Terminal Flight Facilities
- Active and Passive Radar Detection and Equipment