By Stephen Budiansky
No unmarried human invention has reworked struggle greater than the airplane—not even the atomic bomb. Even ahead of the Wright Brothers’ first flight, predictions abounded of the devastating and bad outcomes this new invention might have as an engine of conflict. hovering over the battlefield, the aircraft grew to become an unstoppable strength that left no spot on the earth secure from assault. Drawing on strive against memoirs, letters, diaries, archival files, museum collections, and eyewitness money owed by way of the boys who fought—and the boys who built the leap forward innovations and concepts—acclaimed writer Stephen Budiansky weaves a vibrant and dramatic account of the airplane’s innovative transformation of recent warfare.
On the internet: http://www.budiansky.com/
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Extra info for Air Power: The Men, Machines, and Ideas That Revolutionized War, from Kitty Hawk to Iraq
As rotor speed increases, the rotor tachometer needle shows an increase by moving toward the engine tachometer needle. When the two needles are superimposed, the engine and the rotor are synchronized, indicating the clutch is fully engaged and there is no further slippage of the clutch shoes. Advantages of this system include vibration isolation, simple maintenance, and the ability to start and warm up the engine without engaging the rotor. FREEWHEELING UNIT Since lift in a helicopter is provided by rotating airfoils, these airfoils must be free to rotate if the engine fails.
HEADING CONTROL Besides counteracting torque of the main rotor, the tail rotor is also used to control the heading of the helicopter while hovering or when making hovering turns. ” In forward flight, the antitorque pedals are not used to control the heading of the helicopter, except during portions of crosswind takeoffs and approaches. Instead they are used to compensate for torque to put the helicopter in longitudinal trim so that coordinated flight can be maintained. The cyclic control is used to change heading by making a turn to the desired direction.
Part C of figure 3-22 shows the driving region of the blade, which produces the forces needed to turn the blades during autorotation. Total aerodynamic force in the driving region is inclined slightly forward of the axis of rotation, producing a continual acceleration force. This inclination supplies thrust, which tends to accelerate the rotation of the blade. m. m. For example, if the collective pitch is raised, the pitch angle increases in all regions. This causes the point of equilibrium to move inboard along the blade’s span, thus increasing the size of the driven region.
Air Power: The Men, Machines, and Ideas That Revolutionized War, from Kitty Hawk to Iraq by Stephen Budiansky