In Partnership With

August 15, 1919

Airship Engineering Progress in the United States

The Pacific as a Field of Aerial Activity

The Aerodynamic Experimental Tunnel

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Airship Engineering Progress in the United States

Lighter-than-air engineering is a very recent development in the United States, and was not really taken up seriously until December of 1916, when the possibility of the United States becoming involved in submarine warfare began to be feared.

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The Pacific as a Field of Aerial Activity

Now that the Atlantic has successfully been crossed by a flying boat, an airplane and an airship, and some of the difficulties involved in these exploits have been realized, attention is commanded by another great body of water, which has not yet been conquered by aircraft—the Pacific.
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The Aerodynamic Experimental Tunnel

The study of the forces acting on the different parts of an airplane during its flight is generally carried out in an experimental way on reduced size models of the parts to be investigated. This may be accomplished either by keeping the body stationary in a current of air which is moving at a velocity equal to that of the airplane in flight, or by moving the body, at this same velocity, through calm atmosphere.

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Course in Aerodynamics and Airplane Design

Climb and Speed-at-Altitude Tests After the air speed indicator has been calibrated the climbLing and speed-at-altitude tests may be conducted. Try-out climbs.—While it is easily possible for almost any pilot to obtain the maximum speed of the airplane at any given altitude, it is a matter of considerable skill to get the best possible climb out of a machine. At ground level, if curves of horsepower required and horsepower available are drawn, it wall be found that there is some one speed at which the excess horsepower is a maximum.
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The Design of Hollow Interplane Struts

The superiority in strength per unit of weight of hollow columns over solid columns has long been recognized and utilized. In airplane construction another factor must be considered, for it reduces the apparent superiority of the hollow construction over the solid construction.

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Editorials

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New York-Toronto Airplane Race

An international airplane race and handicap contest will be run on Aug. 25 by the American Flying Club and the Aero Club of Canada under the rules and regulations promulgated by the American Flying Club, with pilots and airplanes licensed by the U. S. Joint Army and Navy Board of Aeronautic Cognizance.

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Book Reviews

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New World’s Altitude Record

Roland Rohlfs, test pilot for the Curtiss Engineering Corp., established on July 30, at Roosevelt Field, L. I., a new official world’s record by reaching an altitude of 30,700 ft., thus breaking the world’s record previously held by Major (then Capt.) R. W. Schroeder, U. S. A., with 28,900 ft., which he established on Sept. 18, 1918, at McCook Field, on an American built Bristol bican plane fitted with a 300 hp.
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Snow Skids

August 11919 September 11919