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The surfaces of a wing or rotor blade are designed to produce lift when air passes over it. Twothirds of the lift is produced by the lower pressure air passing over the wing's or blade's upper surface. 3. The rotor system is using from 20 to 100 percent of the available power and the horizontal velocity is 10 knots or less. Under this condition a pilot may experience settling with power. 4. The lateral axis runs from wing tip to wing tip. 5. The man who first sketched the helicopter and referred to it as a helixopteron was Giovanni Venturi.

A given volume of dry air contains a variety of gases representative of the earth's atmosphere. Indicate which of the following statements most accurately states the composition of this variety. a. Nitrogen, oxygen, argon, carbon dioxide, and minute amounts of other gases. b. Water vapor, dust, and salt particles. c. A percentage of gases varying with the temperature of the air. d. One percent of other gases, 21 percent oxygen, and 78 percent nitrogen. e. Fifty percent oxygen, 48 percent nitrogen, and 2 percent argon.

C. D. 14. This region operates at a negative angle of attack and has no effect. This region operates at a comparatively high angle of attack. This region operates at a complete stall angle of attack. This region operates at a comparatively low angle of attack. Based on the worldwide variation of temperatures with altitude. Dependent upon weather over land or sea. Measured in degrees of change per kilometer. Affected by the height of the stratosphere and time of year. Gyroscopic precession is the result of a force applied against a rotating body, and it occurs, approximately, at a point: A.

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