The principal object of this article is to clear up several points concerning the strength and elasticity of woods used in airplane construction as affected by various agents which will be enumerated later and taken up in the order of their importance.
The Model C. IV Rumpler biplane belongs to the so-called “all-purposes,” or general utility class of enemy machines, which may indiscriminately be employed for scouting, offensive patrol, bombing, etc. Tins machine is chiefly of interest on account of its great speed, which is equal to that of a single-seater fighter, and also on account of its high “ceiling” (6.500 m.).
The United States Patent Office granted on Feb. 19, 1918, the claims made in an application filed on Dec. 11, 1914, by Glenn H. Curtiss, the well known airplane constructor of Hammondsport, N. Y., in behalf of a patent covering the construction of stepped and V-bottomed flying boat hulls.
More powerful armament has recently been proposed for fighting airplanes. In response to an inquiry, Gen. Pershing has recommended at least two heavy and two light machine guns, adding: “We should anticipate the use of three Vickers synchronized guns and three Lewis unsynchronized guns on every airplane.”
In the early days of flying there were necessarily many accidents, owing first to structural weaknesses in the airplanes, and secondly to the fact that the pioneer pilots had to experiment and were mostly unacquainted with many of the factors governing aerial navigation.
ALL THE WORLD’S AIRCRAFT, 1917. Founded by the late Fred T. Jane. Edited and compiled by C. G. Grey, Editor of The Aeroplane. Sampson Low, Marston and Co., Ltd., London. (21 s. net., 600 pp., fully illustrated.) This well known standard reference book on aircraft has just appeared in its eighth year of issue under the able editorship of Charles G. Grey, the editor of The Aeroplane.
4P5—Specifications for Square and Round Bevel Washers General.—1. The general specifications, 1G1, shall form, according to their applicability, a part of these specifications. Use.—2. These washers are to be used on bolts (I. A. S. B. specification 4P3).
A Japanese Aero-Engine Contest.—The Imperial Aviation Association of Japan sometime ago decided to hold a prize contest for aero-engines designed and built by Japanese. There were to be three prizes, of $10,000, $5000 and $2000 respectively for the engines attaining the highest average marks.
Since the bids for airplanes for the proposed WashingtonPhiladelphia-New York aerial mail route were opened as published in the last issue of AVIATION AND AERONAUTICAL ENGINEERING several changes have been made in the program. They concern the details without particularly affecting the main features of the service and with the added considerations make for improvement rather than otherwise.
The War Department on Monday asked Congress for an additional appropriation of $450,000,000 for the aviation program. Benedict Crowell, Assistant Secretary of War, in a letter to the Senate Military Affairs Committee, explained that $200,000,000 was needed to make good a deficiency in the $640,000,000 aviation fund provided by Congress last year, and that $250,000,000 more was necessary for new aircraft, supplies and equipment.