Propellers TRIZ Cases

A serrated locking nut assembly secures spline adapters and shaft bearings through an interference fit between mating components.

A blade pitch control system maintains minimum angles to prevent aerodynamic stall during wind turbine operation.

A turbine nozzle airfoil incorporates a flow fence extending from the leading edge to the trailing edge along the suction side.

A pitchlock system uses a rotating ballscrew and belleville spring to lock propeller blades in position.

An unloaded tip zone reduces the beta angle at the blade extremity to weaken tip vortices, lowering acoustic noise while maintaining mechanical efficiency.

Varying camber line deviation along the blade height reduces secondary vortex phenomena and mechanical fatigue by distributing loads more evenly.

Mechanical coupling drives the variable area exhaust nozzle, eliminating heavy actuators and reducing weight.

A rotatable wind turbine tower uses an asymmetric airfoil cross-section to align with the wind.

Surface perturbations on the fan and core cases mitigate ingested boundary layer flow distortion, enhancing stability margins during take-off.

Closed-loop control of a variable-speed lubricant pump reduces energy consumption and extends pump lifetime by matching supply to actual bearing demands.

An optimized Co-Ni alloy composition prevents ceramic layer peeling by suppressing thermally grown oxide formation at temperatures exceeding 1500°C.

A wind turbine sensor calibration method uses rotor rotation to generate centrifugal forces for automatic measurement adjustments.

Movable covers streamline the airframe during cruise flight to resolve the trade-off between VTOL capability and aerodynamic efficiency.

Replacing DC motors with a PMSM and AC pitch motor eliminates carbon brush wear while a UPS ensures reliable feathering during power failures.

A polyurethane reactive composition forms a highly elastic protective film on rotor blades to resist rain erosion damage.

Seebeck-effect thermal diodes generate electrical power from hot gas flows to heat propfan blades, eliminating brush wear in rotating contact systems.

Single-piece annular turbine rings minimize leakage between blade platforms, reducing engine length while simplifying manufacturing complexity.

Multiple axially offset sensors measure blade pitch angle to eliminate edge-effect errors and reduce beta error across the full operating range.

A cambered turbine blade includes a pressure side stiffening rib that tunes out vibration interferences while preserving aerodynamic performance.

A wind turbine rotor blade features a porous window on the suction side paired with a deployable cover member to manage internal airflow.

A metallic split sleeve captures a double conical blade root, eliminating metal-to-composite fasteners and preventing unpredictable joint failures.

Varying clearance between the fork pin and pin hole reduces local stress concentrations, sustaining compressive residual stress against fatigue.

Grooves in contact surfaces expel debris via pressure differences, preventing abrasive wear and extending component lifespan.

Spring-loaded shaft mechanisms fold propeller blades parallel to airflow, eliminating crosswind drag and stabilizing unmanned aerial vehicles.

Protective shroud extends beyond air intake grille outer edge to prevent clothing contact and clogging, maintaining consistent airflow.

An inclined rotation axis and cardan joint reduce drag and torque by halving counterweight mass, resolving inertia control challenges.

Flow passages deliver cooling gas to limit hot gas ingestion into the wheel space cavity, tempering high-pressure gases and reducing damage.

Segmented sacrificial propeller blade tips absorb erosion and axial forces, preventing structural damage while enabling rapid replacement of worn components.

Coverplate-integrated seal assembly prevents hot gas ingestion and air loss while reducing vibration in rotating machinery.

A nested drone propeller assembly rotates three blades in opposite directions using a magnetized motor housing.

Centrifugal recovery guides liquid lubricant radially outward from the bearing to prevent feathering device contamination.

Pneumatic actuation replaces mechanical clutches to resolve adaptability versus complexity trade-offs in rotary-wing gas turbine engines.

Composite sandwich control input members and bushings reduce weight while compensating for manufacturing tolerances to maintain controllability.

Pivotal winglets on wind turbine rotor blades transition to an articulated position with a deployable sleeve, reducing effective sweep length and fatigue loads.

Continuous weaving merges the spar and airfoil into a single unit, preventing decohesion under mechanical loading.

A propeller folding apparatus adjusts blade positions to reduce drag during high-speed flight.

A removable impeller assembly employs a tubular insert with a radial key portion to prevent shaft rotation and facilitate single-handed maintenance.

Axially segmented impeller joins durable nose and lightweight tail sections to resist foreign object damage.

Segmented rotor blades with a stiffened bend prevent tip opening during extreme deflection, maintaining tower clearance and reducing contact risk.

A coaxial rotary jack drives propeller blade pivots through guide slots and cams to transform rotational motion into radial adjustment.

Elastomeric adhesive buffers thermal expansion differences between foam core and structural layer, preventing cracking during temperature fluctuations.

Segmented blades with bent parts and orifices redirect airflow to reduce tip concentration noise while increasing total air volume.

A fan-in-wing aerial vehicle uses tiltable hatches to expose internal rotors for vertical flight and retract them for streamlined forward motion.

Automated inclinometer system transmits wireless measurement data to computing devices for precise aircraft control surface calibration.

A controllable pitch propeller system adjusts blade angles to redirect acoustic emissions during flight.

A fan uses a single motor to pivot blades between deployed and retracted positions.

Coaxial ring motors drive imbalance masses at high frequencies to cancel hub vibrations, reducing structural fatigue and wear.