In Partnership With

June 1, 1918

News of the Fortnight

The Electric Dynamometer

The Friedrichshafen Bombing Biplane

610611

News of the Fortnight

The inauguration of the regular air mail service between Washington. D. C., and New York took place, as scheduled, on May 15. Although no formal ceremonies attended the inauguration of the service, there was a large gathering of officials at both terminals.
596597

The Electric Dynamometer

The extensive use of electric dynamometers for aviation motor testing prompts the presentation of these notes on the operation of dynamometers for the benefit of those who are called upon to operate them. The operator finds the electric dynamometer so radically different in most respects from the propeller or club test which he may have seen elsewhere that he is at first apt to regard his task as difficult or complicated.

502593

The Friedrichshafen Bombing Biplane

This machine, which bears the marks F.D.H. G.3. 326/17, was brought down by anti-aircraft fire at Isbergues on the night of February 16. A shell made a direct hit on the righthand engine at a height of 8,000 to 9,000 feet, after which the machine covered about six miles and made a fairly good landing.
608609

Digest of the Foreign Aeronautical Press

The Pfalz Pursuit Biplane—Among the more recent German pursuit machines there is one which up to the present has been little known to the general public, although it is employed to a considerable extent by the enemy. This machine, the Pfalz single-seater biplane, is chiefly remarkable on account of the fact that it imitates, as do the recent Albatros pursuit machines, the wing bracing originated by the Nieuport firm, incorporating a larger top plane and a smaller lower plane.
590591

Air Propulsion*

The term airscrew, considered by many writers on aeronautics as descriptive of propeller action, is a misnomer. The theory of the marine propeller, which seems to be adequately presented by the screw principle, has been transferred to air propulsion without sufficient regard for the extreme difference in the two fluids as to elasticity.

600601

International Aircraft Standards Conference

The American Aircraft Commission, which spent several weeks in Europe recently in conference with engineering representatives of the Allies, on the formulation of harmonious specifications of materials and mounting and other dimensions of parts for aircraft, was constituted of three representatives from the Society of Automotive Engineers, three from the International Aircraft Standards Board, two from the United States Signal Corps, and one each from the National Advisory Committee for Aeronautics, the Bureau of Standards, the United States Navy, The American Society of Mechanical Engineers, and the American Society for Testing Materials.

606607

The 1917 Fokker Triplane

The following report has been issued by the British Air Ministry on the Fokker triplane, which was briefly described in the last issue of AVIATION. A fuller report may be issued in the near future, if further inquiry shows that the machine has features of interest.
598599

The S. E. 5A Pursuit Biplane

In the March issue of the German aviation magazine Luftwaffe the following description of the British S. E. 5A pursuit biplane was published, a translation of which is here reprinted by courtesy of The Aeroplane : The airplane in question was built by Vickers, Ltd., and was numbered B.507, bearing further the initial A as well as a white circle.
602603

Official Description of the Liberty Engine

608609

International Aircraft Standards

(Continued from previous issues) 2W2—Mill Specifications for Aircraft Spruce Timber.—1. The following species of spruce may be used in aircraft construction : Sitka spruce (Picea sitkensis), red spruce (Picea rubens), white spruce (Picea canadensis).
May 151918 June 151918