November 15, 1920

November 15, 1920

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Test of Aeromarine Model 40 Wing Structure

Note on Theories of Screw Propulsion

By Henry C. Watts9 min

U. S. Army Air Service

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290291

Test of Aeromarine Model 40 Wing Structure

The Model 40 Flying Boat, which was sand tested, was manufactured by the Aeromarine Plane and Motor Co. of Keyport, N. J. The machine is a two place, pusher type, flying boat, equipped with a Curtiss OXX-6, 100 hp. engine, designed for training purposes.
294295

Note on Theories of Screw Propulsion

The object of this note is to draw attention to a misconception of the theory of screw propulsion which appears in much good work now being done. This misconception lies in the combination of the Froude inflow theory and the Drzewiecki blade element theory used in conjunction with aerofoil characteristics obtained from tests in an air tunnel.

By Henry C. Watts9 min

288289

U. S. Army Air Service

CHIEF OF AIR SERVICE With rank of Major General Menoher, Charles T July 1, 1920 ASSISTANT TO THE CHIEF OF AIR SERVICE With rank of Brigadier General Mitchell, William July 1, 1920 Colonels Hall, Cholmers G July 1, 1920 Mitchell, William July 1920
284285

Surveying from the Air

The great possibilities of airplane photography in connection with the water and land work of the Coast and Geodetic Survey and looming up as a potential factor in expediting the mapping of our waterways and interior surveys. This very important subject has been the object of careful study and experiments by officers of the Survey, in collaboration with the other branches of the Government, during the past year and rapid advance in aerial photography, first seriously undertaken during the War, now promises, with proper development, a method of surveying that will probably far exceed expectations over the old methods in rapidity, economy and minuteness of detail.

By Col. E. Lester Jones6 min

298299

Annual Meeting of the Aero Club of America

The eleventh annual meeting of the Aero Club of America took place at the club house at 11 East 38th street, New York on November 8. Three hundred and eighty-five members of the club were present in person or by proxy. The meeting was held in the dining room, and which was filled by the seventy members who were present in person.
282283

Editorials

The Army Experimental Station THAT another year will see McCook Field at some other place than Dayton is inevitable as the lease on the property now occupied expires next summer and there is no probability of its renewal. The aeronautic industry generally will be glad if the engineering branch of the Air Service can have a location that is more accessible than Dayton.
284285

The Sperry Messenger Airplane

The Messenger plane, as the name implies, was designed by the Engineering Divison of the U. S. Air Service to replace motorcycles for certain messenger duties. It was built by the Lawrence Sperry Aircraft Co., Inc., Farmingdale, Long Island, N. Y. It is a one-place rigid truss biplane of pleasing appearance, which is due to the clean lines of its design.
286287

A German Diesel Airplane Engine

A new type of airplane engine has appeared which possesses many novel features. It has been developed by Prof. Junkers, the noted German aircraft engineer. It has six cylinders and is noteworthy in the following respects: It operates on the two-cycle principle; it has no carburetor, fuel being ejected directly into the cylinders; it has no valves; there are two opposed pistons per cylinder and two crankshafts connected by gearing at one end.
288289

The New Handley Page Wing

The design of aircraft has, from the very commencement, been associated with the problem of safety in rising from and alighting on the ground. Anything which tends to promote slow speed, and therefore safety in landing, is necessarilly to the good of aviation.
296297

A Variable Surface Airplane

The accompanying illustration shows an extremely interesting French machine, with variable wing, recently flown before the French Technical Section at Etampes. The machine has its upper plane in three parts, one of which forms part of a fixed biplane truss, while the other two are moveable, one sliding forward and the other backward.
NOVEMBER 81920 NOVEMBER 221920