THE RESULTS OF A LOW-SPEED WIND TUNNEL TEST TO INVESTIGATE THE EFFECTS OF REFAN JT8D ENGINE TARGET THRUST REVERSER ON THE STABILITY AND CONTROL CHARACTERISTICS

摘要

The following conclusions are made:n1. The Refan airplane, with its target thrust reverser configuration, exhibits slightly improved directional control characteristics relative to those of the Basic 727 airplane.n2. Clocking the Refan side engine thrust reversers 20 degrees out¬board, to direct the reverser efflux away from the vertical tail, has only a minor effect on directional control.n3. Clocking the Refan thrust reversers 20 degrees inboard, directing the reverser efflux toward the vertical nil, results in a virtual loss of rudder effectiveness for speeds above 90 knots (46.4 m/sec). This is not considered an acceptable configuration, since the rudder is the primary means of directional control during the high speed segment of the landing rollout.n4. Variations in the Refan reverser door lip/fence geometry product only minor changes in airplane directional control characteristics.n5. Refan airplane asymmetric reverse thrust characteristics are not unusual.