March 15, 1919

Airplanes at the Aeronautical Exposition

The 125 Hp. Union Aircraft Engine

The USD-9A Airplane


Airplanes at the Aeronautical Exposition

One of the most interesting features of the Show was the exhibition of various small sporting machines. These include the Gallaudet “Chummy Flyabout,” the Dayton-Wright T-4 “Messenger,” and the Navy M-2 type seaplane. The last was primarily constructed for submarine patrol work, but is certainly a possible sporting machine.


The 125 Hp. Union Aircraft Engine

The 125 hp. Union aircraft engine is the product of the Union Gas Engine Co., of Oakland, Cal. It is of the vertical 6-cyl. water-cooled type, with valves in the head, and develops its rated horsepower at 1,400 r.p.m. The weight of the engine, complete with two carburetors, two magnetos, pumps and water piping, is 485 lb., which gives a weight of 3.88 lb. per horsepower.

The USD-9A Airplane

The signing of the armistice found the Airplane Engineering Department ready to deliver for production an airplane, the USD-9A, which met the requirements of the Air Service both as a day bomber and as a reconnaissance machine, at the same time harmonizing fully with the Liberty engine, and was entirely suitable for quantity production by American methods.


Characteristics American Aircraft Engines

ENGINE, No. of Cylinder Rated H.P. Type. R.P. M.& H. H. P. Arrang. Cool of ing Cylin. Normal R.P. M. H.P. Maximum R. P. M. H. P. Gear Reduction Ratio Fuel and Oil Consumption Lbs. Per. HP. Hr.. Lbs. Per. Hr., Gasoline Oil Gasoline Oil Weight Dry with Ign. and Carburetor Weight of Cooling Water Lbs.

News of the Fortnight

Major General William L. Kenly, Director of Military Aeronautics since the split from the Signal Corps, has been relieved from duty with the Air Service, discharged as a temporary Major General only, and ordered to report for duty tc the Chief of Field Artillery, assuming his rank in the regular army as Colonel.

The Liberty Starter for Aircraft Engines

A number of features of unusual interest from the engineering standpoint are to be found in the new Liberty starter for aircraft engines, which is the product of the Liberty tarter Corporation. The Liberty starter was submitted to the Bureau of Steam Engineering of the Navy Department some months ago, where it passed most satisfactorily a 11 preliminary tests.

Inter-communication on Board Airplanes

One of the most difficult problems arising with the rapidly increasing development of aviation has been that of providing a satisfactory means for voice communication between the occupants of airplanes. While the telephone methods of intercommunication have been applied to the solution of this problem, they have been successful in excluding outside noises and in transmitting vocal chord vibrations only to a degree ; in fact the articulation of words is generally poor with these systems.

Development of the American Airship Industry

When the United States entered the Great War there was no American airship industry in being. However, in the spring of 1917 the Bureau of Construction and Repair of the Navy Department issued specifications and asked for bids on sixteen small airships of the so-called Blimp type, which was a British



THE achievement which promises to offer the greatest immediate glory in the field of aeronautical endeavor, and which will perhaps be considered by future generations as the supreme accomplishment of aerial navigation, is the transatlantic flight.

Empire Art Metal Construction in the Airplane

For some time past the Empire Art Metal Co. has been conducting persevering and successful experiments in the application of metal construction to the airplane. The accompanying illustrations and the following brief description will give airplane constructors an idea of the valuable work of this firm, to be followed by a full description at some later date.
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