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Aviation History
1921
1921 - 0373.PDF
JUNE 2, 1921 directions, depending on the installation requirements, without any change in the standard engine, A tapped boss is provided for the insertion of a standard distant type thermometer to register the outlet water tempera- ture. The engine is equipped with a single duplex Packard- Zenith carburettor of the single Venturi type mounted underneath the engine. In addition to making it very acces- sible, this provides for gravity feed. It also insures the greatest possible protection from fire, all vents being carried outside of the cowling so as to eliminate any such possibility from back fire. The use of a single float-chamber for a multiple- cylinder engine has been found to give the best results from the standpoint of uniform distribution and maximum economy, The single carburettor was something of an experiment, but the difficulty of synchronising two or four carburettors for throttle as well as altitude control was so great that it was decided to make the attempt, since it, of course, obviates these difficulties. Data which tests have given us in regard to power output, petrol economy and inlet manifold depression show a very satisfactory result, and it is extremely doubtful whether two or four carburettors could have given as good results. The location of the carburettor, in addition to its greater accessibility and safety from fire hazard, is also a great advance from the point of view of installation and main- tenance. The gravity feed simplifies the whole system, and the change is one which certainly should commend itself at once to aero engine designers. An improved design of mixture control valve of the McCook Field type is used, which gives uniform action and consistent results. Standard ignition equipment consists of two 12-cylinder Dixie magnetos with fixed spark advance. A Vernier type magneto coupling permits the magnetos be;ng properly set and synchronised in a minimum length of time. The magnetos are interchangeable—that is, they revolve in the same direction. Complete double ignition to two sets of spark plugs is provided, and the engine will function properly on either set. The standard engine has provisions for taking the following accessory equipment without any changes : Rear end electric starter, petrol pump, gun synchroniser drive and generator drive. The total weight of the engine, dry, is 735 lbs., and on the maximum development of 398 h.p. output this gives a weight of 1 "85 lbs. per h.p. The petrol consumption with wide-open throttle averages almost exactly £ lb. of fuel per h.p. hour. The accompanying graph gives further details in regard to the performances of the engine on the dynamo- meter. ROYAL AERONAUTICAL SOCIETY NOTICES French and English Glossary.—A number of copies of the Glossary of Aeronautical Terms prepared by the Society, with French trans- lation in parallel text by Capt. L. F. Plugge, Fellow, have been received from the Air Ministry, to whom the Society assigned their copyright for the purpose of this issue. Members who wish to obtain copies of this Glossary should apply to the Secretary. Representatives on other Bodies.—The follow- ing Members have been appointed to represent the Society on various other scientific bodies and committees :— Joint Standing Committee with the S.B.A.C.—Chairman (ex-officio), Vice-Chairman (ex-qfficio), Dr. Bairstow, Wing-Cmdr. Cave-Browne-Cave, Lieut.-Col. A. Ogilvie, Lieut.-Col. M. O'Gorman and Maj.-Gen. Sir R. M. Ruck. British Engineering Standards Association, Aircraft Main Committee.—Lieut.-Col. M. O'Gorman. B.E.S.A., Aircraft Sub-Committee No. 1 (Nomenclature).— Dr. Bairstow, Maj. Low, Lieut.-Col. M. O'Gorman, Dr. Sutton Pippard, Mr. Southwell, and the Secretary. Aeronautical Research Committee.—Lieut.-Col. A. Ogilvie. Conjoint Board of Scientific Societies.—Lieut.-Col. M. O'Gorman. Library.—The following books have been received and placed in the Library :—" Automobile and Aircraft Engines," by A. W. Judge ; " Aeroplane Performance Calculations," by Harris Booth. W. LOCKWOOD MARSH Secretary ADVISORY COMMITTEE REPORTS THE following is a list of Reports published by the Aero-nautical Research Committee during February, March, and April, 1921 ; they are obtainable from H.M. StationeryOffice :— Aeronautical Research Committee REPORTS AND MEMORANDA. 680. Distance required to take off an Aeroplane. • (With Diagrams.) June, 1920. Price 6d. 682. Modification of the Performance of an Airscrew due to the Propinquity of a Plane Surface ; also Experiments with the same Model Airscrew when mounted behind a Model of a Power Car of Airship " R.32." (With Diagrams.) September, 1920. Price ^d. 683. Experiments with Full-sized Machines. Second Series. (With Diagrams.) September, 1920. Price qd, 685. Aeroplane Instruments. Forced Vibrations in. (With Diagrams.) April, 1920. Price 3d. 686. Tests of Four Aerofoils suitable for Airscrew Design. (With Diagrams.) July, 1920. Price 3d. 687. S.E. Aeroplane with Modified Control Surfaces. Experiments on an. (With Diagrams.) September, 1920. Price 4^. 688. Effect of Fairing the Nose^of an " S.F..5 " Fuselage. Experiments on. (With Diagrams and Plates.) September, 1920. Price 6d. 702. Some Tests on Navigation Instruments during a Flight of Rigid Airship " H.M.A.R.33." (With diagrams.) September, 1920. Price 2d. 703. Metallic Couplings for Petrol Pipes. (With Diagrams.) December, 1920. Price t,d. 704. Comparative Performance of various Airscrews for S.E.5A, with Wolseley Viper Engine. (With Diagrams.) November, 1920. Price is. f>d. Aircraft and Aircraft Engines. Report on the Materials of Construction used in. Price 215. Technical Report for 1917-18. Vol. I. Model Work, Price 2is. [Previous lists appeared in FLIGHT, July 3, 1919 ; October 23, 1919 ; February 19, 1920 ; April 22, 1920 ; May 13, 1920 ; August 19, 1920 ; December 2, 1920 ; December 30, 1920 ; February 10, 1921 ; May 26. 1921.J A Bristol Fighter in Honduras NEWS to hand from Tegucigalpa states that the first aerial flight in the Republic of Honduras has been effected by a British pilot on a British aeroplane. The machine was a " Bristol " Fighter, type F. 2 B, and the route traversed was between San Pedro Sula and Tegucigalpa, a distance of some 200 miles. The time occupied in the flight was 1 hour 371 minutes, an average speed of 110 m.p.h., and it is interest- ing to record that in the course of the flight an altitude of 18,000 feet was attained. Levee at St. James's Palace AT the Levee held by His Majesty the King at St. James's Palace on Monday, May 30, amongst those in attendance on His Majesty was Air-Marshal Sir Hugh M. Trenchard, K.C.B., D.S.O., Principal Air Aide-de-Camp, and in attend- ance on H.R.H. the Duke of York, was Wing-Comdr. Louis Greig. Amongst those who attended the Levee was Capt. the Hon. F. E. Guest, C.B.E., D.S.O., M.P., Secretary of State for Air. The following were amongst those presented to H.M. the King :—Flight-Lieut. B. Adamson, Flight-Lieut. F. Barring- ton, Flight-Lieut. C. Bartlett, D.S.C., Flight-Lieut. E. Beulah, Flying-Officer J. Bentham, Flight-Lieut. R. Comp- ston, D.S.C., D.F.C., Flight-Lieut. R. Dickey, D.S.C., Flying- Officer N. Dixon, A.F.C., Flight-Lieut. H. Fellowes, Flying- Officer C. Godfrey, Sqdn.-Ldr. A. Grant, M.B.E., Flight- Lieut. G. Hall, A.F.C., Sqdn.-Ldr. E. St. Clair Harnett, O.B.E., Flight-Lieut. G. Hooper, M.C., D.F.C., Flight-Lieut. W. Longton, D.F.C., A.F.C., Flight-Lieut. C. Mackay, M.C., D.F.C., Flight-Lieut. R. Addenbrooke-Prout, O.B.E., Flight-Lieut. F. Stammers. O.B.E., Sqdn.-Ldr. A. W. Tedder, and Flying-Officer N. Ward. 373
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