MARINE CONTROL DRIVE FAR MORE THAN A MARINE CLUTCH

PRECISE PROPULSION, AGILE MANEUVERING, PLUS FULL AUXILIARY POWER Twin Disc originated the clutch-slipping, power-dividing marine control drive (MCD) more than 30 years ago. The time-tested, field-proven concept has since resulted in a comprehensive lineup of MCDs in Low Dissipation (LD) and High Dissipation (HD) versions across a wide range of power requirements. They offer distinct operating advantages for vessels requiring highly accurate positioning, extreme slow-speed maneuverability and bollard pull scenarios while splitting main engine power to operate auxiliary equipment such as high-power...

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Engines are in idle, MCD and propellers are not engaged. Modulation Mode Propeller speed controlled by engine speed conveyed through MCD's 99% lock-up efficiency for underway propulsion. MCD modulates engine power to azimuth drives for precise approach and maneuvering. Firefighting Mode A Twin Disc MCD functions as a variable-ratio drive that will match propeller speed to the operator's requirements, while maintaining engine speed at maximum output. It performs as a fixed-ratio drive when continuously underway or in bollard pull conditions. When used with fixed-pitch azimuth thruster systems,...

NORMAL MODE FIREFIGHTING NORMALMODE MODE FIFI PUMP POWER PROPELLER ABSORPTION PROPELLER ABSORPTION PROPELLER ABSORPTION MCD OUTPUT RPM RPM FIFI PUMP MCDABSORPTION LOSSES MCD OUTPUT MCD LOSSES FIFI PUMP POWER PROPELLER ABSORPTION FIFI PUMP ABSORPTION MCD LOSSES

Unique hydraulic-coupling design allows for intentional clutch slipping to regulate propulsion speed. A stack of friction disks compresses to a greater or lesser degree to achieve desired shaft rpm. Torque is transmitted through a hydro-viscous media. The MCD is designed to minimize heat impact and clutch plate wear during any clutch slipping operation. When lock-up is achieved, the input and output speeds are synchronized, reaching virtually full (99%) efficiency, unlike most hydraulic couplings. The MCD is an inboard power-dividing solution versus controllable pitch propellers (CPP), which...

IT’S ALL HERE • Smooth, gradual propeller speed change resulting in improved maneuverability • Safer and easier vessel control during slow-speed maneuvering and docking • Adjustment of propeller speeds below engine speed rating • Divides the power from the main propulsion engine to eliminate the need for auxiliary engines • Delivers an instant response when required • Bearing calculated for high universal joint angles at maximum power • Dynamic positioning (DP) capable • Gear-driven, high-power PTO to drive auxiliary equipment • Emergency “come home” device per classification requirements FIND...

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