AMPHIBIAN SNOW-PLANE Russian patent published in 1999 - IPC

FIELD: amphibian transport facilities; motion over snow and water surface. SUBSTANCE: amphibian snow-plane has hull, propeller driven by engine, steering gear and brakes. Propeller is of tractive type. It is mounted in fore portion of hull at negative angle of attack relative to incoming flow. Provision is made for change of angle of attack. Tractive propeller of opposite sense of rotation as compared with first one may be mounted in fore portion of snow-plane. Both propellers may have pitch changed through control of engine power, steering gear control and brake control. Propellers may overlap each other. It is good practice to synchronize their revolutions by means of reduction gears linked by synchronizing shaft. Reduction gears of propellers may be secured by means of turnings which are coaxial relative to synchronizing shaft; they may be connected with device turning both reduction gears in synchronism to preset angle of attack of propellers. Hull may be supported by supports in width and length; supports consists of plates articulated with each other and with hull; provision is made for change of their angle of attack, thus forming multi-step planing of ski support. EFFECT: improved operational properties. 7 cl, 4 dwg