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Aviation History
1921
1921 - 0255.PDF
APRIL 14, 1921 THE SAULNIER THREE-ENGINED CANTILEVER MONOPLANE An Interesting French Design As an object-lesson in the beneficent effect of Governmentencouragement, it is interesting to watch the activity of the French aircraft industry, and to compare it with the com-parative inactivity of that of this country, where lack of Government policy has resulted in the dispersal of nearly allour designing staffs. During the last twelve-months or so quite a large number of new commercial aeroplanes havebeen designed and produced by French constructors, while in this country, apart from a few machines designed for theGovernment competition at Martlesham, few if any new commercial machines have been put into commission. To description and illustrations of this machine. Following is atranslation of the description of the Saulnier three-engined cantilever monoplane :— " The three-engined R. Saulnier is a monoplane of 27 ms.(88 ft. 6 ins.) span, with a thick wing attached directly to the fuselage without external bracing. The wing area is 111> sq. ms.(1,250 sq. ft.). The machine is built of metal throughout, with exception of the wing and fuselage covering, which isfabric. The wing section is such as to satisfy aerodynamic considerations, and at the same time give room for spars ofsufficient depth to withstand the bending moment on the E H E E H HHH m H H m B E E E E E E E HEBE EHBB Two views of a wind-tunnel model of the Morane - Saulnier cantilever mono- plane. take one side of the question only : the French subsidy toair services has already resulted in French constructors getting busy on the production of machines designed especiallyfor commercial work, while here we are, after letting all the air services expire for lack of encouragement, resuming a fewof them again with obsolete or obsolescent machines, simply because there has been no assistance forthcoming for producingmachines really suitable for the work in hand, and which could reasonably be expected to show a profit on a line likethe London-Paris. In our last issue reference was made to a new Saulnier three-engined monoplane, the design of whichhas just been completed. This week we are able, by the courtesy of our French contemporary L'Air, to give a brief wings. The section has been chosen after numerous experi-ments at the Eiffel Laboratory. " The wing spars are in the form of lattice girders, composedof Duralumin sheet and profiles. This girder supports the wing engines, and serves as attachment for the struts of theundercarriage. The wing engines are placed in front of the front wing spar, on frameworks integral with the spar. Thepetrol tanks are placed aft of the wing engines, between the spars. There is no petrol in the fuselage, and a form of ripping,panel is provided for emptying instantly the tanks in case of fire. The tank capacity is sufficient for a flight of sevenhours' duration. " The rectangular section fuselage is built entirely of Duralu- SPAN 88 '-6" 0-A. LENGTH 57r-9" WING AREA 1250 Sa.Fx MORANE-SAULNIER CANTILEVER MONOPLANE 3-37O H.R LORRAINE -DIETRICH ENGINES THE MORANE-SAULNIER CANTILEVER MONOPLANE : General arrangement drawings. 255
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