PORTABLE CONTRA-PROPS SYSTEM Russian patent published in 2014 - IPC F02K3/72 

FIELD: engines and pumps.

SUBSTANCE: proposed system comprises free power turbine, first and second contra-props to run about lengthwise axis, transmission mechanical device and crankcase. First prop is arranged in given direction relative to second prop. Said first and second props comprises bush centre in lengthwise axis, outer shell located off-centre to confine radially the principal circular flow and connection props connecting outer shell with said bush. Transmission mechanical device is driven by free power turbine to actuate said first and second props. Crankcase is arranged between free power turbine and first and second props. Said props are located in given direction relative to crankcase. Free turbine extends in opposite direction relative to said crankcase. Crankcase comprises its extension in said given direction to make the support at second prop rotation. Connection posts of second prop are located in said opposite direction to extend radially outward.

EFFECT: decreased overall dimensions and weight.

14 cl, 4 dwg