In Partnership With

December 1, 1919

Explanation of Peculiarities Observed in Flying in the Wind

Air Fans for Driving Generators on Airplanes

The Static Head Turn Indicator for Airplanes

382383

Explanation of Peculiarities Observed in Flying in the Wind

Considerable misconception exists in regard to the effect of wind on machines which float or fly in the air. The misconception arises principally in not distinguishing between the speed of the machine in the air as compared to the speed of the machine relatively to the ground, and in not having a full realization of the fact that forces are only produced by changes in velocity and not by velocity itself.

396397

Air Fans for Driving Generators on Airplanes

In this paper the authors first briefly describe the method employed by the Radio Development Section of the War Department in testing air fans used for driving the electric generators usually installed on airplanes for radio communication.

388389

The Static Head Turn Indicator for Airplanes

An instrument to indicate whether, under all conditions, the path of the airplane is a straight line or whether it is turning to the right or left is much required. It is well known that when flying in a cloud or at night, and no fixed object is visible, even the most experienced pilot may, without realizing it, be flying on a sharp curve.

386387

Development of a 15-foot Airplane Wing Rib

During the progress of the war the Forest Produets Labortory of the United States Forest Service, Madison, Wis., at the request of the Aircraft Division, Bureau of Construction and Repair, Navy Department, undertook the development of an airplane wing rib of minimum weight, having a chord length of 15 feet, and capable of sustaining, without rupture, a distributed load of 670 pounds.

400401

French Practice in Airship Construction

Specification for Scums of Envelopes—Envelope fabric overlaps ½ in. at seams. Stitching is in two rows ¼ in. apart, seven or eight stitches to the inch. The shuttle stitch is used. One single-ply fabric strip 1⅛ in. wide of same color as exterior of envelope is cemented over exterior seam.

390391

The Linke-hoffman Central Power Plant Giant Biplanes

Some detailed information is now available of the giant airplanes built by the German Linke-Hoffman works, embodying a central multiple engine power plant with a single or twin tractors. The LHRI It appears that the first Linke-Hoffman model (LHRI), shown in Fig. 1, was of an unsuccessful character.

392393

Resume of Wind Tunnel Tests of Airship Envelopes

402403

Air Mail Record

All load-carrying air plane records for the postal mail service were broken on Dec. 2 when a twin-motor De Haviland 4 plane devised by and manufactured for the Post Office Department, covered the distance between the air mail field at Washington and that at Belmont Park, New York—a distance of 218 miles in 1 hour, 34 minutes, with a mail load of nearly 30,000 letters weighing 630 pounds.
380381

Editorials

Cockpit Design

380381

Editorials

Editorials

November 151919 December 151919