Our country and its resources; . the course of this history t all hut two of theflags of unknown history was de- the evidence available in the form of termined. CHAPTER II. AERONAUTICS By BARON L. dORCY, Mem. S. A. E. Static and Dynamic Aircraft—The Drift Balloon—Captive and Kite Bal-loons—Dirigible Balloons—History and Mechanics of the Aeroplane—The Development of Military Aviation—Scouting Aeroplanes—FightingAeroplanes — Bombing Aeroplanes — The Seaplane — Aeronautics inAmerica STATIC AND DYNAMIC AIRCRAFT AERONAUTICS, the science ofaerial navigation, and its vehi-cles, generically t
Our country and its resources; . the course of this history t all hut two of theflags of unknown history was de- the evidence available in the form of termined. CHAPTER II. AERONAUTICS By BARON L. dORCY, Mem. S. A. E. Static and Dynamic Aircraft—The Drift Balloon—Captive and Kite Bal-loons—Dirigible Balloons—History and Mechanics of the Aeroplane—The Development of Military Aviation—Scouting Aeroplanes—FightingAeroplanes — Bombing Aeroplanes — The Seaplane — Aeronautics inAmerica STATIC AND DYNAMIC AIRCRAFT AERONAUTICS, the science ofaerial navigation, and its vehi-cles, generically termed aircraft,subdivide into two distinct branchesand types, respectively. The sciencedealing with machines whieb aresupported by a gas lighter than air, i. e., static aircraft, is called aerosta-tion; its vehicles are the drift bal-loon, the kite balloon and the di-rigible balloon, all of which, itshould be noted, possess the facultyof staying aloft without expendingmotive power. Tbe science dealing. Photo Hollinger WILBUR WEIGHT Photo Hollinger ORVILLE WRIGHT Copyright by Muun & Co., Inc. 364 (HH COUNTRY AMi ITS RESOURCES with machines which are supportedby the pressure onrushing air ex-erts on cambered surfaces, i. e.,dynamic aircraft, is called aviation;its vehicles are the glider and theaeroplane, of which, however, onlythe latter possesses practical value,gliders being only used for experi-mental purposes. Unlike static air-craft the aeroplane cannot remainmotionless in the air, for its abilityto stay aloft is conditional upon itsfaculty to create air pressure bycontinuous motion. This obviousdrawback may some day be obviatedby the helicopter or direct-lift ma-chine, in which sustentation issought to be attained independentlyof horizontal motion by the use ofvertical lifting screws. This typeof machine is still in its experimen-tal stage: such is also the case ofof the omithopter or wing-flappingmachine, which seeks to copy themovements of the birds w
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
