An amphibious vehicle for traversing land and bodies of water includes a chassis, and a cycloidal propeller coupled to the chassis and which includes a plurality of cycloidal propeller blades rotatably coupled to the chassis and each extending parallel a rotational axis of the cycloidal propeller, and an extension/retraction system configured to extend the plurality of cycloidal propeller blades away from the chassis and to retract the plurality of cycloidal propeller blades towards the chassis.

An amphibious vehicle for traversing land and bodies of water includes a chassis, and a cycloidal propeller coupled to the chassis and which includes a plurality of cycloidal propeller blades rotatably coupled to the chassis and each extending parallel a rotational axis of the cycloidal propeller, and an extension/retraction system configured to extend the plurality of cycloidal propeller blades away from the chassis and to retract the plurality of cycloidal propeller blades towards the chassis.

The present invention relates to a controllable pitch propeller capable of changing a blade pitch according to the sailing conditions of a ship and, specifically, to a controllable pitch propeller having an optimal hub-to-tip diameter ratio, the propeller being capable of reducing the size of a hub so as to have a high efficiency that is close to the propulsion efficiency of a fixed pitch propeller (FPP). In order to accomplish the aforementioned objective, the present invention relates a controllable pitch propeller which comprises a hub mounted at the propelling shaft of a ship, and a blade that is mounted at the circumference of the hub and that has a variable pitch, and which is technically characterized by a H/D ratio, of diameter (H) of the propeller and diameter (D) of the hub, of 0.170-0.2.

A feedback device for use in a gas turbine engine, and methods and systems for controlling a pitch for an aircraft-bladed rotor, are provided. The feedback device is composed of a circular disk and a plurality of position markers. The circular disk is coupled to rotate with a rotor of the gas turbine engine, to move along a longitudinal axis of the rotor, and has first and second opposing faces defining a root surface that extends between and circumscribes the first and second faces. The plurality of position markers extend radially from the root surface, are circumferentially spaced around the circular disk, and extending along the longitudinal axis from a first end portion to a second end portion. At least part of the first end portion and/or of the second end portion comprises a material having higher magnetic permeability than that of a remainder of the position markers.

An outboard motor includes an engine, and a propeller driven by the engine via a drive shaft and a propeller shaft, a tilting mechanism that changes a tilt angle of the propeller shaft and/or the drive shaft, a triaxial acceleration sensor and a triaxial angular velocity sensor, and a controller. The controller is configured to acquire at least one of a gravity direction, a traveling direction, or a horizontal direction of the hull using the triaxial acceleration sensor, and detect at least one of a first angle of the drive shaft with respect to the gravity direction, a second angle of the propeller shaft with respect to the traveling direction, or a third angle of the propeller shaft with respect to the horizontal direction using the triaxial angular velocity sensor, to thereby control the tilting mechanism to adjust the tilt angle of the drive shaft and/or the propeller shaft.

An outboard motor includes an engine, and a propeller driven by the engine via a drive shaft and a propeller shaft, a tilting mechanism that changes a tilt angle of the propeller shaft and/or the drive shaft, a triaxial acceleration sensor and a triaxial angular velocity sensor, and a controller. The controller is configured to acquire at least one of a gravity direction, a traveling direction, or a horizontal direction of the hull using the triaxial acceleration sensor, and detect at least one of a first angle of the drive shaft with respect to the gravity direction, a second angle of the propeller shaft with respect to the traveling direction, or a third angle of the propeller shaft with respect to the horizontal direction using the triaxial angular velocity sensor, to thereby control the tilting mechanism to adjust the tilt angle of the drive shaft and/or the propeller shaft.

An outboard motor includes an engine, and a propeller driven by the engine via a drive shaft and a propeller shaft, a tilting mechanism that changes a tilt angle of the propeller shaft and/or the drive shaft, a triaxial acceleration sensor and a triaxial angular velocity sensor, and a controller. The controller is configured to acquire at least one of a gravity direction, a traveling direction, or a horizontal direction of the hull using the triaxial acceleration sensor, and detect at least one of a first angle of the drive shaft with respect to the gravity direction, a second angle of the propeller shaft with respect to the traveling direction, or a third angle of the propeller shaft with respect to the horizontal direction using the triaxial angular velocity sensor, to thereby control the tilting mechanism to adjust the tilt angle of the drive shaft and/or the propeller shaft.

An outboard motor includes an engine, and a propeller driven by the engine via a drive shaft and a propeller shaft, a tilting mechanism that changes a tilt angle of the propeller shaft and/or the drive shaft, a triaxial acceleration sensor and a triaxial angular velocity sensor, and a controller. The controller is configured to acquire at least one of a gravity direction, a traveling direction, or a horizontal direction of the hull using the triaxial acceleration sensor, and detect at least one of a first angle of the drive shaft with respect to the gravity direction, a second angle of the propeller shaft with respect to the traveling direction, or a third angle of the propeller shaft with respect to the horizontal direction using the triaxial angular velocity sensor, to thereby control the tilting mechanism to adjust the tilt angle of the drive shaft and/or the propeller shaft.

A propulsion device for a marine vessel includes a driving source including at least one electric motor, a propeller including blades with changeable pitches and rotatable around a central axis of a propeller shaft together with the propeller shaft, a propeller shaft rotation driver to transmit a driving force from the driving source to the propeller shaft and rotate the propeller shaft around the central axis, and a pitch change driver to transmit the driving force from the driving source to the blades and change pitches of the blades. The propeller shaft rotation driver includes a first shaft, and the pitch change driver includes a second shaft closer to a bow side of the marine vessel than the first shaft.

A compression ratio control device includes a compression ratio controller configured to control a compression ratio of a combustion chamber so that the maximum combustion pressure approaches a combustion pressure upper limit value (cylinder-internal-pressure upper limit value) based on a detection signal of a detector at least when an engine load is equal to or less than a predetermined load (engine full load).