R&D Marine 910 Series Flexible Propeller Shaft Couplings 4–5" 217–723 Nm

R&D Marine 910 Series Flexible Propeller Shaft Couplings 4–5" 217–723 Nm

R&D Marine 910 Series Flexible Propeller Shaft Couplings are designed for marine propulsion installations, providing an elastic connection between the reduction gearbox and the propeller shaft. The coupling reduces engine noise and transmission vibrations while accommodating temporary misalignment and axial thrust.

The series includes six configurations with 4" and 5" flange connections for PRM, ZF, Technodrive, Velvet and Yanmar marine gearboxes. Available torque capacities range from 217 to 723 Nm.

Flexible Polyurethane Disc

The R&D Marine 910 Series coupling consists of a moulded flexible disc manufactured from tough, resilient polyurethane.

The disc is designed to provide the flexibility required for marine propulsion installations while transmitting torque between the connected flanges.

Noise and Vibration Reduction

The flexible coupling reduces engine noise and vibrations transmitted through the marine drivetrain.

Its elastic construction helps isolate vibrations between the gearbox and propeller shaft assembly.

Temporary Misalignment Compensation

The coupling is designed to accommodate temporary shaft and engine misalignment caused by:

• Engine starting and stopping.
• Acceleration.
• Movement or twisting of the vessel structure.

The flexible disc provides space for the fastening bolt heads while allowing elastic movement between the flanges.

Axial Thrust Transmission

The coupling accommodates propeller shaft thrust in both directions.

• Forward Thrust: Transmitted through the polyurethane disc between the two flanges.
• Reverse Thrust: Carried by two cross-mounted plates that also serve as a safety stop.

Material Resistance

The flexible coupling material is described in the catalogue as resistant to salt water, diesel fuel and oils.

Installation

The coupling is designed for straightforward installation and is supplied with fastening hardware.

The steel counterflange with clamping shaft connection shown in the catalogue illustration must be ordered separately.

Available Models and Torque Capacities

Gearbox Compatibility

The supplied catalogue lists coupling configurations for the following marine gearbox brands:

• PRM
• ZF
• Technodrive
• Velvet
• Yanmar

The correct coupling must be selected according to the gearbox flange configuration and required torque capacity.

Key Features

• Brand: R&D Marine.
• Series: 910.
• Product Type: Flexible Marine Propeller Shaft Coupling.
• Flexible Element: Moulded Polyurethane Disc.
• Functions: Noise and Vibration Reduction, Temporary Misalignment Compensation.
• Axial Thrust: Forward and Reverse.
• Material Resistance: Salt Water, Diesel Fuel and Oils.
• Flange Sizes: 4" and 5".
• Torque Capacities: 217 / 361 / 578 / 723 Nm.
• Fastening Hardware: Included.
• Steel Counterflange with Clamping Shaft Connection: Ordered Separately.
• Available Configurations: 6.

Technical Specifications

Torque Capacity and Coupling Selection

Select the correct R&D Marine 910 Series coupling based on the gearbox flange compatibility, flange size and required torque capacity.

The manufacturer's catalogue provides the following calculation for the maximum propeller shaft torque:

Maximum Shaft Torque (Nm) = (Maximum Engine HP / Maximum Engine RPM) × 7120 × Gearbox Reduction Ratio

The calculated shaft torque should be checked against the specified torque capacity of the selected coupling.

Confirm the gearbox flange dimensions and compatibility before ordering. The steel counterflange with clamping shaft connection is available separately.