Download e-book for iPad: A History of Aeronautics by E.C. Vivian

By E.C. Vivian

Show description

Read or Download A History of Aeronautics PDF

Best history_1 books

New PDF release: Sea Eagles Volume One: Luftwaffe Anti-Shipping Units

;Sea Eagles quantity One: Luftwaffe Anti-Shipping devices 1939-1941 (Luftwaffe colors) КНИГИ ;ВОЕННАЯ ИСТОРИЯ Название: Sea Eagles quantity One: Luftwaffe Anti-Shipping devices 1939-1941 (Luftwaffe Colours)Автор: Chris GossИздательство: vintage PublicationsISBN: 1903223555Год: 2006Страниц: 101Формат: PDF в RARРазмер: 35.

Download PDF by : Ships: The History and Specification of 300 World-Famous

Ships: The historical past and Specification of three hundred World-Famous КНИГИ ;ВОЕННАЯ ИСТОРИЯ Издательство: Silverdale BooksАвтор(ы): Chris BishopЯзык: EnglishГод издания: 2005Количество страниц: 320ISBN: 1-84509-303-8Формат: pdf OCRРазмер: 57,7 mbFeatures three hundred mercantile and armed forces ships from precedent days to the current day: - each one send is illustrated with a color art and short carrier historical past - complete requisites for every send comprise displacement, dimensions, armament, pace and supplement RAPIDили IFOLDER eighty five

Additional info for A History of Aeronautics

Example text

As already noted, Walker's work is not over practical, and the foregoing extract includes the most practical part of it; the rest is a series of dissertations on bird flight, in which, evidently, the portrait painter's observations were far less thorough than those of da Vinci or Borelli. Taken on the whole, Walker was a man with a hobby; he devoted to it much time and thought, but it remained a hobby, nevertheless. com 30 A History of Aeronautics arising from scarcely foreseen causes, together with experiment as patient as daring.

The engine and boiler were put in the car to drive two screw-propellers, right and left-handed, 3 ft. in diameter, with four blades each, occupying three-quarters of the area of the circumference, set at an angle of 60 degrees. A considerable time was spent in perfecting the motive power. Compressed air was tried and abandoned. Tappets, cams, and eccentrics were all tried, to work the slide valve, to obtain the best results. The piston rod of engine passed through both ends of the cylinder, and with long connecting rods worked direct on the crank of the propellers.

When on a rapid course this bird is in the habit of furling its wings into a narrow compass. The greater extent of surface is probably needful for the continual variations of speed and instant stoppages for obtaining its insect food. 'On the other hand, there are some birds, particularly of the duck tribe, whose wing-surface but little exceeds half a square foot, or seventy-two inches per pound, yet they may be classed among the strongest and swiftest of fliers. A weight of one pound, suspended from an area of this extent, would acquire a velocity due to a fall of sixteen feet--a height sufficient for the destruction or injury of most animals.

Download PDF sample

A History of Aeronautics by E.C. Vivian


by James
4.3

Rated 4.60 of 5 – based on 3 votes