Aerodynamic additional device for seaplanes and floatplanes

Details Aerodynamic additional device for seaplanes and floatplanes Aerodynamic additional device for seaplanes and floatplanes

B - Operations, Transporting

64

C

B64C 25/54 (2006.01) B64C 35/00 (2006.01)

Patent

CA 2391780

The invention relates to supplementary device for floats of float aircraft that is comprised of four air-tight bladders (10), which can be pressurized with compressed air and which extend along the float and rest on lateral surfaces (11) of the float that is essentially comprised of a casing (1). The bladders (10) are made of an elastomeric material or of another type of flexible and slightly expandable material and are completely overlaid with an elastic and waterproof textile skin (9). In a pressurized state, the edges of the casing (1), i.e. the lateral edges (8) and keel edge (7), are smoothened. This enables the drag coefficient cw of the float to be considerably decreased as soon as the aircraft is in the air. For landing on water and the take-off of the aircraft, the compressed air is evacuated so that the edges (7, 8) can be rendered effective for providing directional stability (keel edge (7)) and for preventing the Coanda effect (lateral edges (8)).

L'invention concerne un dispositif complémentaire pour flotteurs d'hydravions, qui comprend quatre bulles (10) hermétiques pouvant être alimentées en air comprimé, qui s'étendent le long du flotteur et reposent sur les faces latérales (11) du flotteur consistant principalement en un caisson (1). Ces bulles (10) se composent d'un matériau flexible peu extensible ou d'un matériau élastomère et sont recouvertes dans leur globalité, qu'une peau (7) textile élastique et étanche à l'eau. Lorsque les bulles sont alimentées en air comprimé, les arêtes du caisson (1), c.-à-d. les arêtes latérales (8) et l'arête de la quille (7) sont carénées. Ainsi, dès que l'avion se trouve dans l'air, le coefficient de traînée C¿w? du flotteur est sensiblement abaissé. Pour que l'avion amerrisse et décolle, l'air comprimé est évacué de manière que les arêtes (7,8) puissent démontrer leur efficacité pour assurer la stabilité directionnelle (arête de carène (7)) et pour éviter l'effet Coanda (arêtes latérales (8).

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