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December 1, 1917

Airscrew Analysis

International Aircraft Standards

News of the Fortnight


Airscrew Analysis

Introduction Scope.—In a mathematical estimate of the merits of an airscrew it is customary to make, (1) an aerodynamic analysis; (2) a stress analysis; the first to determine the performance, the second the structural safety. Basic Data for Airscrew Analysis.


International Aircraft Standards

3S25—Specifications for Extra Soft Carbon Steel Sheet General.—1. The general specifications. 1G1, shall form, according to their applicability a part of these specifications. MATERIAL.—2. The material for these sheets shall be chosen from the I. A. S. It. standard steels listed below.

News of the Fortnight

Appointment of Aircraft Board Expected According to Howard E. Coffin, acting chairman of the new Aircraft Board, the three civilian members will be announced within a day or two. Already the Army and Navy representatives have been announced by the Secretary of War and the Secretary of the Navy, respectively, and it only remains for the President to appoint the three civilian members.

The 160 Hp. Benz and Mercédès Aircraft Engines Compared*

The 160 hp. Benz and the 160 hp. Mercédès engines are, at the present moment, thoroughly representative of current German practice in aircraft engine design, which is emphasized by the fact that nearly all of the enemy airplanes that have been captured by the Allies were found to be equipped with either Benz or Mercédès engines.

The 450 Horsepower Friedrichshafen Bomber*

The Friedrichshafen Aircraft Works (Flugzeugbau Friedrichshafen, Gesellschaft m.b.H.), which has long specialized in the construction of seaplanes equipped with one and two engines, is now manufacturing a twin-engined bombing airplane, several samples of which have recently been captured on the French front near Verdun and in Macedonia.


Digest of the Foreign Aeronautical Press

Aeronautics (London), October 24, 1917 The Air Offensive.—With a view to the great air offensive in the spring, the Germans have been content to allow their program of aircraft construction to be announced to the world through a neutral medium.

Aeronautical Patents

OCTOBER 9, 1917 1,242,295. To Daniel M. Willard, Bakersfield, Cal., assignor of one-half to Albert J. Mills, Bakersfield, Cal. Flying machine. 1,242,412. To Robert D. Andrews, Brookline, Mass. Flying apparatus. 1,242,540. To Walter R. Fuller, Atlanta, Ga. Airplane.
November 151917 December 151917