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| Hélice Voisin | |
|---|---|
| Name | Hélice Voisin |
| Caption | Early Voisin pusher biplane with characteristic "Hélice" tractor propeller |
| Type | Aircraft propeller |
| Designer | Gabriel Voisin |
| Manufacturer | Voisin |
| Firstflight | 1907 |
| Primaryuser | Voisin Company |
Hélice Voisin is the name applied to a family of early aircraft propellers and associated pusher biplane installations developed by Gabriel Voisin during the pioneer era of aviation. The term encompasses wooden, laminated airscrews and the integrated propulsion arrangements used on Voisin-built aircraft and licensed designs, which played a central role in the evolution of aeronautical engineering in France and influenced contemporaneous work in United Kingdom, United States, Germany, Italy, and Russia. Voisin's work intersected with notable figures and institutions such as Louis Blériot, Wright brothers, Santos-Dumont, Antoinette (engine), and the Aéro-Club de France.
Voisin began experimenting with airscrew geometry and construction in the years following his collaboration with Gustave Eiffel and his partnership with Charles Voisin at the Voisin workshop in Billancourt. Early tests drew on empirical findings from Wright Flyer experiments, data circulated via Scientific American and demonstrations at Issy-les-Moulineaux. The Hélice Voisin lineage was refined through iterative trials at sites including Buc (France), Vélodrome d'Hiver, and exhibitions like the Paris Air Show precursors. Interaction with engine makers such as Salmson, Renault (automobile), and Gnome shaped blade profiles to match powerplants used in Voisin pusher biplanes flown by aviators like Henry Farman, Raymonde de Laroche, Roland Garros, and Adolphe Pégoud. The outbreak of the First World War accelerated standardization for military procurement by authorities including the Service Technique de l'Aéronautique and prompted licensed production under firms such as Anzani and Vickers.
Hélice Voisin propellers were typically carved from multiple laminates of hardwood—principally peroba, mahogany, and hickory—glued and clamped to achieve controlled grain orientation, a practice paralleling techniques used by Wright Company and later by Fairey Aviation. The blades employed a semi-elliptical planform with a thickened root and laminated scarf joints to resist centrifugal loads imposed by engines like the Gnome Omega and the Le Rhône. Mounting arrangements on Voisin pushers used a beefed-up tubular structure tied into the airframe members used by Voisin III and Voisin V types, with torque transmitted through splined hubs influenced by patents held by Société des Moteurs Gnome et Rhône and contemporaneous gearings patented in France and United Kingdom. Pitch and camber were factory-set; later experiments incorporated variable-pitch concepts under investigation by inventors such as Frank W. Caldwell and companies like Sopwith Aviation Company. Manufacturing techniques drew on woodworking skills from suppliers linked to Breguet (aviation) and the furniture trades centered in Région parisienne.
Installed on pusher biplanes, the Hélice Voisin demonstrated reliable thrust characteristics during low-speed, short-field operations typical of early military reconnaissance sorties for units like the French Aéronautique Militaire and civilian exhibitions flown by Santos-Dumont adherents. Flight tests measured climb rates and cruise speeds against contemporaries such as the Farman HF.20 and Sopwith Tabloid; the Hélice Voisin offered consistent performance with engines in the 50–110 hp range. Endurance and vibration characteristics were documented in trials overseen by technical committees of the Aéro-Club de France and at test centers associated with Centre d'Essais en Vol. Durability issues—delamination, erosion from exposure, and damage from ground handling—prompted maintenance protocols influenced by recommendations from Royal Flying Corps manuals and the Service Technique de l'Aéronautique. Aerodynamic efficiencies were modest compared with later laminated and metal airscrews developed by Hamilton Standard and Metropolitan-Vickers, but the Hélice Voisin was praised for manufacturability and reparability in forward operating conditions.
The Hélice Voisin family spawned a range of sizes and hub fittings to suit farmanized and Voisin chassis, including specialized versions for floatplanes like those trialed at Étang de Berre and seaplane trials under Société des Avions Voisin. Licensed derivatives were produced by workshops in United Kingdom, Italy, and Russia for locally built Voisin-type aircraft; firms such as Makers of Suffield and small carpentry shops supplied replacement blades during wartime mobilization. Experimental derivatives explored different airfoil sections influenced by studies from National Advisory Committee for Aeronautics and individuals like Henri Coandă, and some prototypes used laminate/metal hybrid constructions anticipating later work by Vultee and Curtiss. Aftermarket modifications incorporated reinforced hubs and alternative mounting patterns derived from patents by Émile Levasseur and Lioré et Olivier.
The Hélice Voisin contributed to the codification of propeller manufacturing and maintenance practices in early twentieth-century aviation, informing standards later adopted by national authorities such as Bureau of Aeronautics equivalents and committees at the International Aeronautical Federation. Its pragmatic balance of simplicity, repairability, and adequate aerodynamic performance influenced contemporaries including Farman, Caudron, Breguet, and Caquot and set precedents followed by suppliers to the Royal Flying Corps and United States Army Air Service. Elements of Voisin’s airscrew philosophy—laminate construction, planform shaping, and integration with airframe structures—resonate in later work by Hamilton Standard, De Havilland Propellers, and Société des Hélices à Clichy, and are acknowledged in technical histories covering pioneers like Gabriel Voisin and early manufacturers such as Voisin (aircraft manufacturer).
Category:Aviation history Category:Propellers (aeronautics)