SCREW PROPELLER AND MOTOR SNOWBOARD PROVIDED WITH SUCH PROPELLER Russian patent published in 2007 - IPC B63H1/26 A63C17/12 B60F3/00 

FIELD: amphibian transport facilities; manufacture of rotor-screw propellers.

SUBSTANCE: proposed screw propeller is provided with cylindrical rotor with helical ridge on its external surface. Propeller has one pair of parallel cylindrical rotors at opposite winding of helical ridges which has constant helix angle of spiral forming taper surface by vertices of ridges. Part of helical ridges of one cylindrical rotor is mounted in recesses between ridges of other cylindrical rotor. Cylindrical rotors having helical ridges may be made from aluminum alloy; diameter of cylindrical rotor is equal to 50 mm and diameter of ridges ranges from 80 to 190 mm. Proposed motor snowboard includes snowboard proper, drive including engine and control system and screw propeller. Used as engine is high-speed two-stroke carburetor engine at displacement of up to 100 cm³.

EFFECT: reduced overall dimensions of propeller and snowboard; high speed of motion; low labor input for manufacture; enhanced operational reliability.

5 cl, 2 dwg