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February 15, 1918

The Wind Channel: Its Design and Use

German Technique in Aerial Armament

News of the Fortnight

9091

The Wind Channel: Its Design and Use

It has long been realized that experiments in the laboratory on small models afford in certain cases a means of obtaining, cheaply and rapidly, information on the behavior of the actual structure under the conditions in which it is to be used.

9495

German Technique in Aerial Armament

Victory in aerial warfare, as in warfare on land and sea, consists in preventing the adversary from executing his designs, either by preventing him from continuing the fight or by destroying his matériel and personnel until he can no longer resist.

108109

News of the Fortnight

It is announced from Washington that following the receipt of a cablegram from General Pershing the War Department has been led to consider the discontinuance of aviators' special pay. The matter has not, however, definitely been decided upon as yet.
100101

Italy’s Plans for Postal Airplane Routes

In view of the proposed creation by the U. S. Post Office Department of a postal airplane route between New York and Washington considerable interest should attach to enterprises of a similar nature which are now being attempted abroad. Italy, more than any other country in Europe, appears to display in this respect a particularly farsighted policy; her progressive views on the problem of commercial aeronautics and her endeavors in this field should therefore attract wide and more than passing notice.
106107

Digest of the Foreign Aeronautical Press

Aircraft Engines at High Altitudes.—Whatever types or engine may eventually predominate among military and naval aircraft, there is at least one respect in which they will differ very widely from those used for the propulsion of commercial airplanes—namely, the height at which maximum power will be available. The power developed by an ordinary engine of fixed compression ratio becomes less as the height of the machine above sea level increases, the fall in power being roughly proportional to the fall in density of the atmosphere.
9899

Bids Asked for Five Postal Airplanes

The Post Office Department has taken the first step towards establishing commercial aeronautics in this country. On Feb. 12 bids were called for by Postmaster-General Burleson for the construction of five postal airplanes to be used in the establishment of a regular daily aerial mail route between Washington, Philadelphia and New York.
102103

Standards of Construction, Fire Hazard and Fire Protection for Hangars

The following standards and recommendations have been prepared and are presented by the Queen Insurance Co. of America to indicate a general outline of good practice in well recognized fire prevention methods. They contemplate the hangar and shop equipment of a modern flying field, but it will be noted that they may be applied with equally good effect in the construction and equipment of a private hangar so far as the needs of the private owner may extend.
8889

Approximating the Static Thrust and Brake Horse Power of Air Propellers

In the July 15, 1917, issue of AVIATION AND AERONAUTICAL ENGINEERING there appeared an article by F. W. Caldwell entitled “Method of Approximating Static Thrust of Propellers,” which I desire to make the subject of the present article. Mr. Caldwell’s data are somewhat meagre and may lead to results 20 per cent from the actual figures, since he ignores the variable element of blade widths, a most important factor.

104105

The Cleveland Aero Engine

104105

An Airplane Propeller Turning Lathe

An airplane propeller turning lathe has been designed by the Defiance Machine Works for the turning of propellers and struts, as used on the various types of aircraft, but it can also be used for the production of other irregular shaped articles of varying lengths and widths up to 12 in.
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