In Partnership With

September 15, 1919

Course in Aerodynamics and Airplane Design

Electrostatic Effects on Airships

Predicting the Performance of an Airplane

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Course in Aerodynamics and Airplane Design

Part III.—Experimental Aeronautical Engineering

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Electrostatic Effects on Airships

Mixtures of hydrogen and air in proportions between certain limits may be exploded by a minute electric spark. Such mixtures may occur near any opening such as a valve of an airship from which hydrogen is being emitted into air. And sparks may pass from one part of an airship another or from the airship to a cloud, or to the ground, electric charges are acquired which produce sufficient differences of potential.

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Predicting the Performance of an Airplane

The curves shown herewith were prepared to provide a means for quickly estimating the absolute ceiling, and the climb and maximum and minimum horizontal speeds of a given airplane at any working altitude. To enter the charts it is necessary to have values for the total weight of the airplane, the area of its main planes, and the power of its engine at sea level—only.

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The Stanford University Aerodynamic Laboratory

The first Stanford University aerodynamic laboratory was installed during the fall and winter of 1916-1917, through the efforts of Professor W. F. Durand. The immediate purpose in view was the provision of an equipment for carrying on an investigation on air propellers.

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The New York-Toronto Airplane Race

The international airplane race and handicap centest organized by the American Flying Club over the New Yark-Toronto-New York round-trip course was contested from Aug. 25 to 29 by fifty-four actual starters out of fifty-seven entrants.
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Editorials

Editorials

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Equipment Warehouses

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Editorials

Airplane Fittings

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European Air Lines

180181

Inactive R.M.A.’s Fly

The Commanding Officer at any Air Service station where flying is authorized may permit qualified Reserve Military Aviators, who are in inactive status, to take such flights in Government aircraft as he deems advisable. Cross-country flights will not be made under this authority and no interference with the regular training or the operation of a station will be permitted.

September 11919 October 11919