Propellers TRIZ Cases

Independent blade length, chord, and pitch adjustment balances pressure and load to improve rotor efficiency and reduce cavitation risk.

A spring plate hub secures UAV blades by friction, cutting mechanical complexity while enabling fast blade changes and compact storage.

A propulsion analysis model matches battery, motor, and propeller combinations to improve electric aircraft thrust, efficiency, and in-flight pitch adjustment.

An asymmetric, angularly offset blade pitch schedule cuts in-plane cyclic loading while improving thrust in open rotor aircraft propulsion.

A spring-loaded lock secures deployed UAV propeller blades against forward folding, enabling compact storage without sacrificing deployment reliability.

A sweeping gearbox deploys telescoping wings and stabilizers after launch, preserving compact storage while enabling longer-endurance flight.

Splitting thrust between primary and secondary fans creates a third stream that improves packaging, weight, and thermal management.

A partially reinforced cavity strengthens hollow composite turbomachine blades while limiting added mass and reducing vibration risk.

Strategic internal supports and elastomer filling strengthen hollow composite turbine vanes while damping skin vibration and torsional stress.

A forward-extending slat and movable wing nose vary the inlet gap to boost low-speed lift while limiting cruise drag.

Remote counterweight levers use centrifugal force to offset blade-twist axial loads, reducing counterweight mass and actuator complexity.

Fan-shaped rotating inlet struts and a spinner inlet redirect airflow into the core duct, cutting gas turbine inlet losses and improving ram recovery.

Forward and aft fuselage-mounted rotors replace wing-tip nacelles to cut drag and structural support while preserving VTOL and forward flight.

A central gripping interface inside the engine cowl replaces external lifting points to improve balance, aerodynamics, and rotation during handling.

An anisotropic composite blade changes pitch automatically with flight conditions to improve lift, cut drag, and avoid mechanical pitch controls.

Strategic placement near the wing quarter-chord uses high-pressure airflow to boost thrust while reducing scrubbing and interference drag.

Blade tips and roots are locked to hold pitch during rotation, cutting propulsor fan noise caused by centrifugal blade twist.

Strategic placement near the wing quarter-chord uses high-pressure airflow to boost thrust while reducing drag, noise, and fuel burn.

Variable rotation during EBPVD tailors turbine coating thickness by surface zone to limit spallation and CMAS attack.

A 3D-woven branched root creates a compact composite propeller blade that resists tensile, bending, and circumferential compression loads.

Gradual weft-yarn crossings in a 3D-woven blade root raise circumferential stiffness while keeping composite propeller roots compact and robust.

A compact in-line gearbox and hydraulic fan hub layout handles higher blade loads and limited turbofan housing space.

Adjustable differential blade phasing lets coaxial rotors deliver VTOL lift, then align with airflow in cruise to cut drag, vibration, and noise.

Individual blade actuators and variable-speed rigid rotors help eVTOL aircraft carry heavy payloads with lower noise and stable transition control.

Nested coaxial ducts and steering flaps improve VTOL airflow control, flight time, payload space, and propeller safety.

Grooved blended wing body sections let open-fan engines ingest boundary layer flow while reducing noise and shielding against crosswind and debris.

Separate slider and swashplate actuators improve rotor blade pitch precision while reducing off-axis loads, weight, and maintenance.

Hybrid ply layup uses automated fiber placement for large sections and manual placement in complex airfoil areas to cut burden without losing strength.

Selectable thrust rings tune propeller pitch and slip without blade changes, increasing thrust and reducing cavitation at lower RPMs.

Using rotors for lift in forward flight, this VTOL case shows how variable pitch and RPM can reduce control surfaces while preserving stability.

A preloaded retainer secures the fan blade bearing against vibration and contaminants, reducing wear and assembly complexity.

Surface undulations on a ducted fan engine nosecone accelerate vortical flow decay at blade roots, improving efficiency and reducing vibration.

Preloading a retainer keeps variable pitch fan blade bearings stable under vibration and shielded from contaminants during assembly.

Movable blade treatments change propeller airflow and sound phase so multiple blades can absorb noise and create destructive interference.

Metal casings extended into the blade cavity help a composite fan blade spar transmit loads, resist stress, and prevent shell delamination.

Alternating rigid and flexible cone sections deform under rotation to break inlet ice into smaller pieces and reduce downstream impact and vibration.

Fluid injected from nose cone nozzles wets sand and dust so fan centrifugal force diverts them away from the compressor inlet.

A ring and screw-nut vane root retainer cuts propeller pitch-system parts, easing assembly access while maintaining secure hub retention.

A compact in-hub hydraulic actuator and coaxial gearbox adjust turbofan blade pitch while handling high blade loading in limited engine space.

Positioning an unducted fan near the wing quarter chord uses higher-pressure flow to boost thrust while limiting drag and weight penalties.

Sensor-based vibration monitoring detects incipient blade flutter and adjusts airflow effectors in real time to prevent aeromechanical instability.

Using the wing's high-pressure airflow, this case shows how propulsor placement can boost thrust while reducing drag and power penalties.

A selective power transfer mechanism lets one motor switch torque between two unidirectional fans, cutting thrust system weight and complexity.

Placing the generator in the nose cowl saves turbine space, improves cooling conditions, and allows easier maintenance access.

Individually controlled VTOL propulsion units cross unstable airflow zones quickly to avoid oscillations, preserve control, and cut transition energy use.