The surfaces of a wing or rotor blade are designed to produce lift when air passes over it. Two-thirds of the lift is produced by the lower pressure air passing over the wing's or blade's upper surface.
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.
The term "standard conditions" refers to atmospheric pressure of approximately 14.7 psi or 29.92 inches of mercury at sea level with a temperature of 15°C.
NOTE: (Each question of this kind consists of a series of statements related to the stem that precedes them. Select True or False for each question.)
9.
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.
When the helicopter is moving forward at a speed of 150 knots, and the velocity of the rotor blade tip is 363 knots, the advancing and retreating blade speeds are: