March 1, 1917

Effects of Altitude on Aviators

Course in Aerodynamics and Airplane Design

Navy Sends Out Proposals for “Blimps"


Effects of Altitude on Aviators

Atmospheric air in all places and at all altitudes has a practically uniform composition as regards the proportion of oxygen to those inert gases which we class for most purposes as “nitrogen.” Accordingly the partial pressure of oxygen, which is the amount available for breathing at any altitude, varies proportionately to the barometer; and the barometer falls according to a definite curve as we pass upward from sea level.


Course in Aerodynamics and Airplane Design

Land Pursuit Machine; Land Gun Carrying Machine; Twin Engined All Round Machine


Navy Sends Out Proposals for “Blimps"

On February 26 the United States Navy Department sent out requests for bids on dirigible balloons. Bids will be opened March 6. These bids are sent out by the Bureau of Steam Engineering and the Bureau of Construction and Repair, jointly, and constructors are asked to state the price for one, two, four, eight and more dirigibles.

The Application of Ball Bearings to the Airplane

The application of ball bearings to the airplane differs in no essential from their employment in other and better known mechanisms. The success of this type of bearing in many of the more familiar fields, as in that of the automobile and the machine tool, has been so marked as to render its use there quite a matter of course.


Sand Load Tests on Wing of Curtiss Flying Boat H-12

The tests of the H-12 wing were conducted at the order and according to the standard instructions of the British Admiralty. The official witnesses for the Admiralty were Lieut. George Sykes and Lieut. E. C. Hugh. The United States Navy was officially represented by Lieut. W. Capehart, and the United States Army by J. V. Costello.


Use of Aircraft in Saving Life and Property at Sea

One of the important duties of the Coast Guard is the assistance of vessels in distress, the saving of life and property from the perils of the sea and the removal or destruction of derelicts and other dangers to navigation. The records of the service for the fiscal year ending July 1, 1916, show that floating property to the value of over ten and one-half millions was assisted; that derelicts to the value of over $100,000 were brought in and restored to their owners; that thirty of these derelicts, dangers to navigation, were removed or destroyed; that over twelve hundred persons were saved from death or imminent peril; and that over fifteen thousand persons were on vessels assisted.

Note on Stresses in Built-up Rectangular Bodies Due to Rudder Forces

The analysis of the stresses in the body is far from complete, and one of the stress producing causes, namely, the force on a rudder whose center of pressure is fairly high above the center line of the body, seems worthy of consideration. In this brief note, the wire and longeron stresses induced by the forces on the rudder are worked out for a single panel of a fairly typical rectangular body, with dimensions and areas of tail surfaces as shown in Fig. 1.


News of the Fortnight

The British Government has among its plans for Canada the establishment of a large number of reserve squadrons of the Royal Flying Corps, and the construction of airplanes on a large scale. For some time past the Imperial Munitions Board has been inspecting numerous sites for an aviation plant and school, and has selected Camp Borden as being the most adaptable for the purpose.


The Air Service Under Universal Training

On February 21 the General Staff plan for universal military training was transmitted to Congress by the Secretary of War. This plan is the result of careful study by military experts and has been drawn to meet the military needs of all branches of the service.

Training Military Aviators

February 151917 March 151917