MULTI-ENGINE airplanes may be divided into those which can and those which cannot fly with the full normal load after one or more of the engines have stopped. Until within a very short time the former class was practically non-existent. The latter class includes military airplanes in which it is desired to obtain a fuselage having a nose without an engine and those in which sufficient power cannot be obtained from a single powerplant.Some two-engine planes that can fly with a single engine on a test flight fail to do so after having been in use for some time. Ability of a two-engine plane to fly with one engine usually necessitates a sacrifice in the pay-load to such an extent that its operation is uneconomical. Flying with one engine of a multi-engine plane idle is difficult because of the reduction of the propeller speeds of the remaining engine or engines and the turning forces involved.These disadvantages can be overcome only by applying greater forces through the controlling surfaces, which, in turn, entails the additional disadvantage of increased head-resistance. The solution of the propeller problem lies in the use of adjustable-pitch propellers, which, however, add further undesirable complications.Although a multi-engine plane provides insurance against forced landings, this insurance is gained only at the cost of increased fuel-consumption and greater head-resistance. In simplicity, efficiency, economy of running and initial cost, the advantages are said to be all on the side of the single-engine plane. If multi-engine planes are considered desirable because of their insurance of reliability, the minimum number of engines used should be three; and in few cases is such insurance worthwhile except in large and expensive craft.MULTI-ENGINE airplanes may be divided into those which can and those which cannot fly with the full normal load after one or more of the engines have stopped. Until within a very short time the former class was practically non-existent. The latter class includes military airplanes in which it is desired to obtain a fuselage having a nose without an engine and those in which sufficient power cannot be obtained from a single powerplant.Some two-engine planes that can fly with a single engine on a test flight fail to do so after having been in use for some time. Ability of a two-engine plane to fly with one engine usually necessitates a sacrifice in the pay-load to such an extent that its operation is uneconomical. Flying with one engine of a multi-engine plane idle is difficult because of the reduction of the propeller speeds of the remaining engine or engines and the turning forces involved.These disadvantages can be overcome only by applying greater forces through the controlling surfaces, which, in turn, entails the additional disadvantage of increased head-resistance. The solution of the propeller problem lies in the use of adjustable-pitch propellers, which, however, add further undesirable complications.Although a multi-engine plane provides insurance against forced landings, this insurance is gained only at the cost of increased fuel-consumption and greater head-resistance. In simplicity, efficiency, economy of running and initial cost, the advantages are said to be all on the side of the single-engine plane. If multi-engine planes are considered desirable because of their insurance of reliability, the minimum number of engines used should be three; and in few cases is such insurance worthwhile except in large and expensive craft.


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    Titel :

    Single-Engine versus Multi-Engine Airplanes


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    Pre-1964 SAE Technical Papers ; 1906



    Erscheinungsdatum :

    01.01.1928




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Single-engine versus multi-engine airplanes

    Fokker, A.H.G. | Engineering Index Backfile | 1928


    Multi-engine airplanes and forced landings

    Smith, H.G. | Engineering Index Backfile | 1926


    Relative safety of multi-engine airplanes

    Perkins, K. | Engineering Index Backfile | 1936


    Relative safety of multi-engine airplanes

    Perkins, K. | Engineering Index Backfile | 1936


    Generalized performance selection charts for single-engine pursuit airplanes

    Ivey, H. Reese / Stickle, George W. / Brevoort, Maurice J. | TIBKAT | 1943