Aerodynamics For Naval Aviators by H. H. Hurt, Jr.

By H. H. Hurt, Jr.

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Flight at High Lift Conditions 34 NAVWEPS 00-8OT-80 BASIC AERODYNAMICS EFFECT OF HIGH LIET DEVICES. ) is to increase the CLn, of the airplane and reduce the stall speed. The takeoff and landing speeds are consequently reduced. 15 and is summarized here: weight of the airplane and the horizontal component of lift be equal to the centrifugal force. Thus, the aircraft in a steady turn develops a lift greater than weight and experiences increased stall speeds. Trigonometric ‘relationships allow determination of the effect of bank angle on stall speed and load factor.

9 The principal effect of the extension of flaps is to increase the C,, and reduce the angle of attack for any given lift coefficient. - 00 (II far C‘, L. i6. e valid for any airplane. The chart shows that no appreciable change in load factor or stall speed occurs at bank angles less than 30“. Above 4S” of bank the increase in load factor and stall speed is quite rapid. This fact emphasizes the need for avoiding steep turns at low airspeeds-a flight condition common to stall-spin accidents. 15 has a 100 knots at the landing weight configuration.

This fact provides a fundamental concept of flying technique: Angle of attack is tbs primary Controlof airspeedin steady flight. Of course, the control stick or wheel allows the pilot to control the angle of attack and, thus, control the airspeed in steady flight. In the same sense, the throttle controls the output of the powerplant and allows the pilot to control rate of climb and descent at various airspeeds. The teal believers of these concepts ate professional instrument pilots, LSO’s, and glider pilots..

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