Nakashima Propeller is a general manufacturer of marine propellers and other propulsion equipment. Nakashima Propeller provides reliable propulsion equipment for vessels navigating the world’s oceans and seas.

Product lineups

Main propulsion systems CFRP Propeller

Nakashima Propeller has succeeded in developing the world’s first CFRP propeller aimed at commercial vessels. Special characteristics such as ‘highly efficient’, ‘quiet’ and ‘lightweight’ allow for outstanding performance, obtained by making full use of material properties.

In 2015, Nakashima Propeller won the Prime Minister’s Prize at the 6th Monozukuri Nippon Grand Awards, with the title «developing the world’s first carbon fiber-reinforced plastic propeller for merchant ships in order to realize energy savings.

CFRP Propeller

Special Characteristics

Lightweight

  • Weight is 1/5th of conventional NAP propellers, making installation easy.
  • Shaft diameter is reduced due to lower moment of inertia.

High Strength

  • Higher material fatigue resistance than conventional materials, increasing reliability.

Low Vibration

  • High damping performance drastically reduces vibration.
  • Improved living conditions

Overload Reduction

  • The shape of the blade is able to deform slightly to match water flow, reducing overload in case of rough conditions such as storms.

High Performance

  • Propeller efficiency is improved through a larger diameter.
  • Cavitation occurece is suppressed.

Improved Maintenance

  • If stocking spare blades, damaged blades can be replaced quickly.
  • Exchanging blades requires no special expertise, and blades can also be repaired

Special Characteristics

Reduced Torsional Vibration Stress

Comparing Composite and Metal

Because CFRP is both lighter and stronger than conventional NAB material, both propeller weight and moment of inertia are lower, reducing torsional vibration stress.

Comparing the vibration-damping properties of CFRP and NAB

CFRP has a higher damping ration than conventional NAB material, leading to both suppressed singing and reduced torsional vibration stress.

Elastic Deformation

Elastic Deformation

By deforming in the direction of pitch reduction due to increased load, during stormy weather (rapid load change) or acceleration, engine overload can be suppressed by letting energy escape through flow-induced elastic deformation.

Suppressing Cavitation

Suppressing Cavitation

A CFRP propeller deforms according to load conditions, suppressing cavitation, leading to reduced stern vibration.

CFRP Propeller Lineup

CFRP Propeller Lineup