Langley, Samuel Pierpont, 1834-1906 · Washington Smithsonian Institution · leaf 55
mation as to the minimum velocity at which the maximum sustaining power can be obtained for a distance apart of 4 inches. For a distance of 2 inches apart even the highest velocities show a serious diminution of efficiency. The results of these observations with two sets of planes, one above the… … Times of falling 4 feet of single and double pairs of 15 x 4 inch planes set at different angles of elevation and having a horizontal velocity of 6.5 meters per second. Abscissae : = Angles of inclination of plane to horizon. Ordinates : = Time of fall in seconds. These later observations also…
Aeronautics · Flight
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
