TWO-ROTOR COAXIAL SYSTEM WITH MIRRORED SWASH PLATES Russian patent published in 2010 - IPC B64C27/32 

FIELD: aircraft engineering.

SUBSTANCE: two-rotor coaxial system with mirrored swash plates comprises reduction gearbox with two coaxial hollow shafts running in opposite directions and supporting rotors hubs. Proposed system comprises also circuits of matched control over total, differential and cyclic pitch of each rotor that include two swash plates. Note here that hollow fixed column is arranged inside top rotor rotary shaft that axially moves down relative to reduction gearbox drive gear hub. Cyclic pitch control rods are laid inside said column. Column top part accommodates top rotor swashplate, its slide ring being coupled by the rod with extra slide ring arranged at the column bottom part. Top rotor control elements are fitted on the shaft and column so that shaft downward displacement occurs without dismantling control system or reduction gearbox, and changing in operating state requires no extra adjustments for control system.

EFFECT: safe and efficient rotors, reduced sizes.

1 dwg