is an option on standard CP-propeller systems.
On a feathering propeller the blade angle can be arranged in line with the water flow. This reduces the water resistance and gives the following advantages;
power reduction by shutting down one of the two propellers in twin screw systems
allows for maintenance at sea of one shaft line while the other is in operation
With twin screw installation and one side out of operation it is possible to reduce requirements for the shaft brake with CP-propeller.