Propulsive Elements TRIZ Cases

Pivotable arms and a skeleton-sealed motor make the sea scooter compact to store while blocking water and sand ingress in saltwater use.

An electrically isolated bearing liner blocks cathodic current paths, reducing marine deposits, wear, and early thrust assembly failures.

Hydrophilic water-glycerin hydraulics let controllable pitch propellers keep operating through leaks while reducing pollution and maintenance.

Calibration maneuvers and compensation coefficients remove AUV magnetic interference, enabling accurate subsea geological mapping without extra specialists.

A preloaded elastic element holds blade pitch fixed until resistant torque rises, improving maneuvering, cruising efficiency, and oscillation control.

A ridge-separated reverse bucket guides jet water smoothly to both sides, improving marine vessel backward thrust while reducing hull impact and re-suction.

Adjustable twin propulsion axes switch from toe-in to more parallel alignment to preserve surfable waves while improving boat turning.

By moving the bevel gearbox above the mounting flange, this marine drive cuts drag, removes struts, and improves thrust transfer.

Independent actuator shifts on two direction-changer portions enable water jet steering in two perpendicular directions for better boat maneuverability.

A pivoting in-nozzle deflector gate redirects jet water upstream, improving reverse steering and maneuverability without sacrificing forward thrust.

A split inner-outer housing keeps the stator stationary, removing slip rings while preserving compact pump-jet steering and thrust.

Replacing bulky mechanical boosters with a motor-driven cable assembly changes water flow direction while saving space, weight, and hull design freedom.

An in-hull bevel gearbox drives contra-rotating propellers without struts or skegs, cutting drag, noise, and water flow obstruction.

Opposite-pitch grate blades limit water recirculation into a vector-flow thruster intake, helping maintain thrust through 360-degree nozzle rotation.

A waterline roller brush and dedicated propeller help a floating pool robot resist currents, stay aligned, and remove edge stains.

Counter-rotating propellers cancel gyroscopic torque, enabling a slimmer strut that lowers drag, propulsion power needs, and noise.

A clamshell housing holds a split line cutter and captive screws, improving alignment and preventing dropped parts during underwater shaft work.

A dual jet-pump assembly combines compact maritime propulsion with micro-keel cooling to manage motor heat during operation.

This case shows how a front keel cavity lets water pass through during turns, reducing bottom resistance while preserving seaworthiness.

Damper-controlled water flow replaces external planes, helping two-thruster vehicles counter Munk moment and hold position in currents.

A dedicated lubricant circulation line cools propeller shaft seal rings, limiting frictional heat and extending sealing service life.

A dedicated lubricant circulation line cools propeller-shaft seal rings, reducing friction wear while preserving effective sealing.

A waterborne vessel uses a vacuum system to collect debris and an electric winch to move the removable container along guiderails.

A personal watercraft compresses ingested fluid to supply a remote propulsion device.

Deflectors on a reverse gate redirect water upwardly and laterally, reducing pitching and rolling while minimizing thrust loss through apertures.

Rubber hose bearings replace watertight units to eliminate sand wear and reduce maintenance costs on water propelled flying boards.

A passive variable pitch propeller assembly adjusts blade angles automatically using hydrodynamic lift and spring forces.

Magnetic attraction holds the thruster while a wedge locking mechanism secures it, eliminating heavy lifting and underwater operations.

A hydrofoil craft uses a prone deck and adjustable thruster to stabilize rider posture.

A motorized water vehicle compresses water via its propulsion turbine to supply pressurized fluid.

A semi-autonomous waterborne vessel uses rotatable thrusters and variable buoyancy to lift submerged payloads from the seafloor.

Adjustable stator blade pitch angles generate perpendicular control forces, eliminating tunnel thruster drag and sonar interference in underwater vehicles.

A vessel tunnel member moves between retracted and extended states to shape water flow toward the propeller nozzle.

A hybrid unmanned underwater vehicle uses reconfigurable thrusters to switch between parallel and intersecting orientations for versatile propulsion.

A variable pitch propeller adjusts blade angle automatically using hydrodynamic pressure differences generated by water flow through non-parallel orifices.

A dual coaxial NSS position determiner system uses two vertically separated devices to calculate spatial coordinates via triangulation.

A DC busbar protection system sums simultaneous current measurements to identify deviations from expected differential thresholds.

Multiple flow passages with controllable reversible pressure units enable simultaneous thrust and moment control in a full solid angle range.

Increasing propeller pitch enhances torque and reduces motor shaft speed, resolving propulsion efficiency trade-offs.

A demountable cable cutter uses a segmented hub to enable radial insertion onto a propeller shaft without removing the propeller.

An integral composite dome and nozzle structure uses a common high-temperature resin system to merge structural support and thermal insulation into one monolithic component.

Replacing mechanical propellers with a solid-state thermal thruster reduces hydrodynamic drag and biofouling while improving fuel efficiency.