Rotary Propellers TRIZ Cases

Dovetail slots defined by wedge retaining members restrict radial movement of composite propeller blades, reducing drive system stress.

Chambering elements create localized high-pressure zones at leading edges, directing cooling gas through gaps to reduce excessive air consumption.

A shaftless axial-flux underwater propelling device uses a hydraulic film to lubricate the rotor and transmit thrust without mechanical contact.

Forward-extending bracket resolves angled transom space conflicts by positioning the thruster for proper water flow and night operation visibility.

Rotatable lower drive unit repositions propellers via control signals to prevent injury during swim operations and reduce damage risk in shallow waters.

Vertical guide device allows electric thruster to emerge or submerge, enabling hybrid propulsion without structural boat modifications.

Flanking rudders forward of the propeller counteract rotational pull in reverse, reducing the minimum turning radius for planing hull boats.

A ceiling fan motor adapter uses a segmented set screw mechanism to securely couple the motor shaft to the downrod.

Segmenting motors into shaft and shroud zones reduces stationary volume while maintaining propulsion power.

A variable pitch propeller blade features a trailing edge notch that accommodates adjacent blade passage during pivoting.

A control device delays gearshift by holding the mechanism in neutral until simulated ship speed drops below a threshold.

Magnetic fields absorb axial and radial loads in a rim-driven propeller unit to eliminate bearing wear from water turbulence.

A torsion bar spring and viscous fluid damper absorb twisting vibrations in the drive shaft, eliminating trolling noise caused by component resonance.

Integrating a brushless motor with an impeller eliminates bulky transmission systems, reducing compartment volume and fuel consumption for smaller vessels.

Decoupled counter-rotating rotors with dynamic blade pitch resolve the speed versus maneuverability trade-off in turbulent underwater environments.

A hybrid watercraft propulsor combines a variable pitch propeller with a rotating duct to enhance thrust and efficiency.

Helical propeller blades align with fluid flow to optimize lift generation and reduce drag on rotating rotors.

High-strength retention plates and bolts secure propeller blades, reducing bolt count and enabling underwater servicing.

A retractable propeller drive assembly moves the propulsion unit into a hull housing to reduce vessel height.

A propulsion system uses a rotatable member with vanes to accelerate fluid flow through a tubular structure.

Strut and plate openings route exhaust gas to aerate water around propellers, reducing drag and improving acceleration.

Segmenting the propulsion unit into a removable fin and conformal battery pack eliminates drag during paddling while providing electric boost.

Varying chord length along ventilator propeller blades reduces secondary flows at the root and head, improving aerodynamic performance.

Annular drive mechanism eliminates central shaft obstruction, reducing mechanical complexity and component density while maintaining fluid flow efficiency.

Hull hollow compartment maintains constant air pressure around surface propeller via atmospheric intake.

A modular assembly system secures hydrofoils to outboard motor anti-ventilation plates using frictional engagement and adhesive foam tape.

Opposed threads on a long shaft propeller controller drive debris away from the bearing, preventing wear in shallow water operations.

Dynamic water curtain prevents air suction at the propeller in shallow waters, eliminating flow resistance from static tunnels.

Timed hubcap blades convert harmful hub vortex into forward thrust, reducing cavitation and vibration for small marine vessels.

A passive air induction system draws ambient air into a propeller tunnel to form a compressible cushion that absorbs cavitation energy.

Tapered hubs reduce exhaust back pressure by extracting flow paths, minimizing vacuum effects while maintaining structural strength.

An inboard electric motor drives a surface-piercing propeller through a magnetic coupling, eliminating lubricant pollution and extending battery life.

Segmented dampers with inclined surfaces reduce shape change during steering to maintain control stability while attenuating engine vibration.

Linear drive extends inline thruster through minimized aperture to reduce flow noise and space occupation.

Elongated rudder profiles with bulb sections generate side forces at small angles, resolving poor astern controllability of flat plate designs.

Circumferential ring propulsors eliminate cavitation and hull penetrations by housing blades within shrouds to enable precise three-dimensional maneuvering.

Plastic cathedral structures counterbalance heavy metal plates to improve seabed coupling while simplifying component access.

Segmenting the propulsion system into rigid and soft sections allows independent speed control, optimizing energy efficiency across varying fluid viscosities.

An inner rib inside the squealer tip defines a cavity that limits leakage flow transit, reducing aerothermal heating and extending blade lifetime.

Beveled cutting edge grinds debris at small clearance, protecting rubber seal from leakage.

Nested pivot pins simplify assembly while preventing fouling and corrosion through integrated galvanic anodes.

Geometric steps on marine propeller blades create high pressure peaks, resolving low pressure zones that limit thrust and require larger diameters.

Adjusts propeller rotational speed within specific angle ranges to minimize cavitation occurrence.

Segmented discharge paths lower flow resistance and counter-pressure, enhancing drive power while minimizing noise emissions.

Curved protrusions in boat hull propeller tunnels minimize low-pressure regions and cavitation to boost propulsion efficiency.

Forward skew and S-shaped blade profiles reduce cavitation in permanent magnet thrusters, improving thrust efficiency.

Adjustable pivot pins compensate for wear and production tolerances, reducing drag and noise in marine propulsion systems.

Segmented grommet design prevents water ingress while enabling easy harness removal for maintenance.

A hydrofoil mounting assembly uses friction surfaces and bolted disk components to secure the device on marine drive plates.

Segmented blades with vibration-proof dampers buffer collision shocks while allowing easy assembly and disassembly of the hub.