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

Energy Saving Device Ultimate Rudder

The Rudder-Bulb Closest to the Propeller in the World

The three factors improving efficiency using rudder bulbs are as follows:

1) Reduced hub vortex
2) Increased wake gain due to homogenized wake flow
3) Optimized interference between propeller and rudder

Ultimate Rudder

Improving efficiency by having a rudder bulb located near the propeller, the Ultimate Rudder has a rounded cap, allowing a configuration of the bulb as close as possible to the propeller.

Energy-Saving Effect of Approximately 6%

Using a normal rudder, a strong hub vortex is produced from the propeller cap toward the port side of the rudder, causing energy loss, while the Ultimate Rudder is able to recover the vortex using the bulb head. This brings an increase in negative pressure at the rudder’s leading edge, leading to reduced rudder resistance, increasing hull efficiency through the use of the Ultimate Rudder.

Ultimate Rudder

Advanced Material Bulb Head

The Ultimate Rudder is designed for an FRP material bulb head to be attached to the copper nut cover. The bulb head can be easily removed & reinstalled onto the nut cover, making maintenance easy.

Advanced Material Bulb Head