June 15, 1920

June 15, 1920

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Over-Cloud Flying and Commercial Aeronautics

By Prof. Melville Jones31 min

Notes on Propeller Theory and Design

By Alexander Klemin14 min

N. A. C. A. Reports

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Over-Cloud Flying and Commercial Aeronautics

The problem I propose to consider tonight is that of longdistance flight when the country is covered with a practically continuous layer of clouds with low under surface and bad weather underneath—the kind of day in fact that we know, to our cost, predominates in this country in the winter months.

By Prof. Melville Jones31 min

396397

Notes on Propeller Theory and Design

The Propeller as a Windmill or Brake in the Airplane The propeller acts as a windmill, when rotation and an effective torque are produced by the action of the air flowing past it, as contrast ed with the propeller or tractor in which the forced rotation produces an effective thrust.

By Alexander Klemin14 min

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N. A. C. A. Reports

Copies of these reports may be obtained upon request from the National Advisory Committee for Aeronautics, Washington, D. C. SPARK PLUG DEFECTS AND Tests—Synopsis of Report No. 51, National Advisory Committee for Aeronautics. Part I of this report discusses the various causes of failure of spark plugs, viz.: (1) Fouling with carbon deposit causing short circuit; (2) fouling with oil deposit causing open circuit; (3) breaking of the insulator; (4) preignition; (5) conduction through the insulator; (6) electrical puncture of the insulator; (7) minor trouble, such as warping and breaking of electrodes, etc.
392393

Editorials

IN a recent copy of L'Aeronautique a French author explains in a very logical fashion the manner in which internal combustion engines may be adapted for altitude flight. In the early stages of the war everything was done to improve the power of a motor by the increase of compression, by the increase of piston velocity and by the use of special materials to secure lightness.
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Determination of Sweepback for Line-Up

It is evident that if a dihedral angle is given to a panel having a built-in angle of incidence, a certain back sweep of the wing will result. As a great many biplanes and triplanes are now being built having a horizontal upper panel, with a lower panel having a dihedral angle, it is necessary to determine the amount of this sweepback in order to properly line up the machine.

By T. P. Wright4 min

400401

Gun-Airplanes Against Tanks

A number of very interesting tests were recently conducted at McCook Field to determine the relative value of bombs and the new 37 m.m. cannon when used to attack tanks at low altitudes. The first flight was made by Lieut. H. R. Harris in a Martin Bomber on which a 37 m.m. cannon, firing a one pound shell was mounted on the nose.
400401

The New Handley-Page Wing

With regard to the novel wing form discovered by the technical department of Handley Page, Ltd.—which is said to double the lifting power for the same linear dimensions— the following account from The Aeroplane, may shed some light on this remarkable discovery.
400401

Armored Airplane for Ground Strafing

A new armored triplnne and an observation plane, designed and built by the Engineering Division of the Air Service, have just been tested at McCook Field, Dayton, Ohio. The tests proved to be a great success. The armored craft is the Le Pere triplane, equipped with two Liberty engines.
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