Expressly
发表于 2025-3-25 05:40:54
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radiograph
发表于 2025-3-25 08:29:34
The Atmosphere of the Earth,height, but conventional flight is possible only in its denser layers. In fact, about 99% of the total mass of the air is found below about 40 km (25 miles). Commercial airliners fly considerably below this height at roughly 30,000 to 50,000 ft (9 to 15 km), with the supersonic Concorde going to abo
文件夹
发表于 2025-3-25 13:15:13
Air in Motion, of texts discussing fluid mechanics, the basis of aerodynamics. In this chapter we will close our discussion of the underlying science of flight. We have already seen that fluid mechanics teaches the behavior of fluids—liquids and gases—at rest and in motion. Only after mastering these fundamentals
BRAND
发表于 2025-3-25 16:52:24
Turning to Aerodynamics, and in motion—the field of fluid mechanics. The atmosphere, the medium in which airplanes fly, has also been discussed. With this background, we can now turn to aerodynamics, the study of the forces acting on all objects moving in a fluid. Natural and man-made objects are included; from fish to sub
esculent
发表于 2025-3-25 23:32:02
Aerodynamic Drag,t origin of these forces resulting from the complicated interplay of body shape, the properties of the fluid, and the flow speed, a pull is exerted opposing the direction of motion. As shown in Figure 1.1, the force experienced in the direction opposite to that of an airplane’s motion is called .. I
摇晃
发表于 2025-3-26 01:28:07
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高兴一回
发表于 2025-3-26 04:18:08
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Conflagration
发表于 2025-3-26 09:10:44
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同时发生
发表于 2025-3-26 12:52:30
Air Transportation and the Outlook for the Future, exists an extensive, readily accessible literature on the subject, and so we will view only a few interesting— and lesser-known—facets of the traffic revolution occasioned by aviation. Airplane buffs who are interested in the great variety of existing and planned aircraft for civilian and military
STELL
发表于 2025-3-26 19:50:19
Textbook 1997Latest editionwould in a car? The answer, of course, lies in the wings and the air they are moving through, and the study of the flow of air around airplane wings is part of the science of aerodynamics. This book is about aerodynamics in the broadest sense. In addition to airplanes, it discusses the aerodynamics