The stern end of a seawater hull has a rotor hub with propeller blades
thereon. The rotor hub is rotated for propulsion of the hull by means of
a propeller shaft extending through a sealed compartment within the hull.
Such sealed compartment and an electrically powered control system is
disposed within the hull to automatically adjust angular deflection of
deformable tip portions of the propeller blades by means of blade
embedded actuators, in response to varying input signals which
respectively reflect changes in seawater conditions such as temperature
and strain imposed on the propeller blades during propelling rotation of
the rotor hub.