February 21, 1921

February 21, 1921

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American Press Commends Air Mail

Aero Engine Efficiencies

By A. H. Gibson10 min

Note on Measurement of Speed of Airplanes

By S. Herbert Anderson9 min

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American Press Commends Air Mail

Congressman Madden, of Illinois, it would seem has brought a hornet’s nest about his ears when he declared in the House of Representatives that the Air Mail service, “in his opinion, has a doubtful value.” For the newspapers of the country, potential molders of public opinion, have let it be known through crisp and pungent editorials that the Air Mail service, which effected a saving of $42,500 on the New York-Washing ton route last year, and $100,000 on the New York-Chicago route, must not be abandoned.
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Aero Engine Efficiencies

By the efficiency of a petrol engine, one usually understands the thermal efficiency, or the ratio of the heat returned as work on the crank shaft, to the heat energy in the fuel. This efficiency is vitally important in an aero engine intended for long-distance work, since it directly affects the weight of fuel to be carried.

By A. H. Gibson10 min

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Note on Measurement of Speed of Airplanes

In a recent paper Dr. J. G. Coffin calls’ attention to the fact that in airplane speed trials over a measured course it is generally considered necessary to wait for a time when little or no wind is blowing, or if any, that it be along the course.

By S. Herbert Anderson9 min

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Civilian Aviation Schools

During and subsequent to the war, much was written concerning the method of training aviators for the Army and Navy Air Services. Accepted candidates were first sent to a ground school, where for about three months they were given instruction in the theory of flight, military drill, radio communication, map reading and other military subjects.

By Richard H. Depew8 min

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Jacuzzi Seven Passenger Monoplane

The firm of Jacuzzi Bros., Inc., of Berkeley, Cal., have designed and built the monoplane shown in the accompanying photographs. The plane is constructed for passenger carrying or other commercial purposes. Wing Construction By the use of externally braced monoplane construction it was possible to use a comparatively thin wing section with consequent high maximum L/D at low angles of incidence and high speed.
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Strength Tests of Screw Fastenings of Plywood

Plywood in many of its uses, requires nails or screws to fasten it to a frame. The selection of the proper size of nail or screw, the spacing, and margin calls for knowledge relative to the purpose for which the plywood is to be used. If the plywood is to be used as a mere covering the size of nail or screw used or the spacing are relatively unimportant.

By H. S. Grenoble6 min

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First Year's Result in Aircraft Underwriting

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Book Review

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Veneer Or Metal Construction

There is considerable talk among airplane designers, both in America and abroad, regarding the next step in materials used for airplane constructions. It is pretty generally accepted as a fact that the fabric-and-wood type of construction, as used during the war, is not satisfactory for commercial ships, from the standpoint of operation and first cost, alone.

By William B. Stout3 min

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Wind Tunnel Test Stations

February 141921 February 281921