Propellers TRIZ Cases

See how a wall-housed diaper changing table pulls out to provide working space and retracts for

See how a nested control tube and crosshead mechanism enables rotor blade pitch control while m

See how a motor-driven telescoping shaft lowers the fan assembly to reachable height and rotate

A strategically placed balance mass shifts ram air turbine resonance outside the operating range to cut self-induced vibration loads.

A sun-and-planet gear layout synchronizes folding fan blades, cutting parts and assembly effort while keeping the fan compact and balanced.

An integrated inertial weight on the dryer blower wheel retards motor pulsation to cut audible noise without sacrificing airflow power.

Aligned retainer members engage only during blade-loss or bearing-failure events, limiting geared architecture axial movement.

Disposable segmented covers with slits and hook-and-loop fasteners protect ceiling fans and lights quickly without blade removal or custom sizing.

By making the drive gear no harder than the ring gear, pitch bearing wear shifts to an easily replaced part and avoids crane-based servicing.

Variable blade thickness around fan blade notches cuts noise and collision loss, reducing motor power while maintaining airflow.

A bellows flex support allows normal movement, while aligned stop members engage in extreme events to limit geared architecture axial shift.

A mounting ring and concealed wiring let a cap fan rotate 360° without detachment, reducing entanglement and weather exposure.

Welded shaft sections machined in one setup improve bearing alignment, cut vibration, and simplify air cycle machine rotor assembly.

Leading-edge reinforcement ribs and an oval hub cut propeller fan weight and material use while preserving stiffness and airflow.

Oscillating airflow between a wing and support surface lowers static pressure to generate lift while reducing turbulence, drag, and power demand.

Varying blade thickness between ring-adjacent and center sections cuts airflow resistance, improves velocity uniformity, and lowers fan power.

Varying ring thickness redirects molten flow into angled meld lines, strengthening injection-molded fan rings under high-speed stress.

A motor-coupled rotary vane changes outlet direction along a circular path, expanding air coverage while reducing space and manual handling.

Adjustable suspension, upward-tilted twisted blades, and resilient bushings let a large ceiling fan clear obstacles while spreading airflow evenly.

Multiple cross-flow fans around a central motor improve multi-directional airflow while reducing indoor unit vibration, noise, and heat loss.

A dual-hub fan with vibration isolation members cuts cogging-driven noise and vibration while preserving airflow and structural integrity.

A ramped multi-chamber blower redirects water-heater exhaust parallel to the flue, easing compact venting and limiting condensate entry.

Fiber weaving forms impeller blades and integrated conductive elements in one part, cutting manufacturing cost and complexity for turbomachines.

Fine mist nozzles above ceiling fan blades use airflow and evaporation to deliver localized cooling without noisy or bulky equipment.

An integrated gearbox-generator layout cuts wind turbine drivetrain size and weight while insulating bearings from damaging electrical currents.

By moving the blade-connecting ring inward from the tips, this fan cuts noise, keeps strength, and avoids a larger diameter.

A sun-and-planet gear layout synchronizes retractable ceiling fan blades while reducing parts, fan height, and balance issues.

A cup-holder battery fan uses a pivoting impeller and bell-shaped outlet to direct cooling air safely when a golf cart is stationary.

Using the Faraday effect, this MEMS optical sensor detects surge and lightning currents with high EMI resistance and wide bandwidth.

A center flow partition splits dual condenser fan discharge, cutting noise while lowering transport refrigeration engine-compartment temperature.

A bulbous blade profile with early maximum thickness and a rounded leading edge cuts turbulence and noise near heat exchangers.

A balanced vertical-axis blade layout captures wind from any direction, avoiding blade-adjustment losses in turbulent near-ground airflow.

Blade-edge notches cut trailing-vortex noise, while rear projections redirect airflow circumferentially to recover fan pressure and wind output.

A wrist-end pivot and telescoping struts let pilots reposition the armrest quickly while locking firmly against in-flight loads.

Active blade deployment replaces centrifugal opening, concealing fan blades when idle while improving balance, speed range, and airflow.

Mixed-flow impellers, a matched vaneless diffuser, and variable speed drive improve large chiller efficiency across stages while reducing size and energy use.

Internal plates in a modular fan housing keep downward air columns concentrated at floor level for localized heating and cooling in high-ceiling spaces.

Condenser exhaust airflow removes evaporator condensate without drainage plumbing, cutting aircraft chiller weight, cost, and space use.

A split collet and outer sleeve couple composite rotor blades to metallic bearing races while preserving load transfer and blade removability.

Back EMF from moving flight elements is routed through a brake resistor to create counter-torque and damp unsafe motion during power loss.

Tapered magnets inserted into an expanding sleeve cut rotor weight and improve cooling while maintaining secure magnet retention.

Fixed lift fans and a rear pusher propeller replace tilting propulsion, simplifying VTOL aircraft maintenance and flight transitions.

Rotating wings and rotor supports let a flying vehicle switch between VTOL, fixed-wing flight, and compact road mode with lower space occupancy.

Swivel side flaps cut thrust while downstream rudders keep full steering control and stable air-cushion flow in a single-engine hovercraft.

Opposed PWM vectors let dual inverter circuits share a DC bus to drive motor windings with lower noise, vibration, and failure risk.

Lever detents and dynamic cockpit feedback simplify water-to-air mode changes in seagliders and similar craft, reducing operator cognitive load.

Separating cabin microphones and speakers with DSP-based phase inversion cuts aircraft enclosure noise without bulky insulation or feedback.

Moving one electric motor ahead of the transmission frees rear access to the propeller pitch adjustment system without propeller interference.

A telescopic duct extends for hover thrust and retracts in forward flight to cut frontal area, drag, and efficiency loss.

Retaining structures secure rotor magnets while slats drive radial airflow to dissipate heat and support higher-speed aerial motor operation.

Direct electromagnetic blade rotation removes bevel gears and outer bearings, enabling a lighter compact fan with high thrust for eVTOL aircraft.

A coaxial eVTOL propulsion layout shares low-volume oil cooling and lubrication across the inverter, gearbox, and motor to cut heat and fire-barrier burden.

Oil-cooled gearbox and heat-exchanger layout cuts heat, noise, and vibration while supporting reliable distributed eVTOL propulsion.

Measured supply voltage is used to adjust motor speed and propeller pitch, preventing torque loss and stall in electric aircraft propulsion.

A planetary gearbox-driven pump circulates oil for lubrication and cooling, helping eVTOL electric propulsion cut wear, heat, noise, and vibration.

An electric motor and inverter counter hybrid-aircraft propulsion vibrations in real time, reducing instability and structural fatigue.

A planetary eVTOL gearbox cuts motor speed for propeller torque while using minimal oil cooling to limit heat, vibration, and weight.

Correlated magnets let a propeller hub disengage on blade impact, limiting motor damage while preserving continued propulsion.

Opposed PWM vectors in dual inverter circuits stabilize the DC bus and cancel motor vibration, improving eVTOL propulsion reliability.

Equal and opposite PWM vectors in dual eVTOL inverter circuits stabilize motor drive, cutting noise and vibration while improving fault tolerance.

Electrically actuated memory alloy wires move a sliding lock while a position limiter holds lock state without continuous power.

A spring-biased latch locks an eVTOL tilt joint after actuator disconnection, preventing uncontrolled rotation without redundant hardware.

Annular ducted rotors driven by axial-flow or piezoelectric motors cut energy use while improving thrust, stability, and flight range.

Different waveguide modes steer microwave sensing in two directions to track blade position with less wiring, lower noise, and higher reliability.

Electronic rotor position control parks and folds VTOL blades for road use while preserving large rotor area for efficient flight.

Monitored supply voltage lets aircraft propellers reduce speed and adjust pitch to preserve torque and thrust when motor voltage falls.

Automatic landing-site selection, glide control, and variable-pitch thrust help a hybrid eVTOL land vertically after propulsion faults.

A concentric actuator around the fluid transfer bearing cuts turbomachine bulk and power use while enabling variable-pitch blade actuation.

Asymmetric lock slots stop proprotor rotation in non-rotary flight, limiting aeroelastic instability and enabling higher tiltrotor airspeed.

Upstream and downstream thrust units reshape local flow to cut viscous drag and power use while improving low-speed thrust efficiency.

A segmented lip and labyrinth seal uses knife edges, airflow, and biasing to limit lubricant leakage and contaminant ingress in propeller shaft bearings.

Airflow openings and a tortuous path help a hybrid propeller shaft seal limit lubricant leakage, contamination, and wear in bearing systems.

Captive fasteners and tool-access passages let turbomachine fluid lines self-align for sealed connection with faster removal and lower maintenance effort.

Dynamic display elements map pilot inputs to authority limits, helping eVTOL pilots judge remaining control margin in hover and transition.

A one-way clutch pitch lock stops fan blades drifting to fine pitch after hydraulic pressure loss, cutting drag and preserving coarse pitch.

Cross-wing electrical bus routing lets distributed lift and tilt propellers share control paths, improving eVTOL fault tolerance without single-point failure.

Rotating propeller assemblies align landing gear with each flight phase, cutting forward-flight drag while preserving VTOL lift and range.

A convex-concave bearing fitting and pitch arm let rotor blades pivot and rotate for quicker thrust response with less added control complexity.

A secondary bearing engages after primary failure to keep rotor pitch change active while reducing skidding, false brinnelling, and maintenance risk.

Blade-root electric actuators and gear trains replace hydraulic pitch systems to cut propeller weight and enable precise, faster blade control.

Flexible tip extensions help ducted rotors hold tight blade-to-duct clearance, absorb contact forces, and reduce wear without replacing full blades.

Flexible rotor blade tip extensions keep duct clearance tight while absorbing unintended contact and simplifying worn tip replacement.

A feedback limiter uses measured actuator speed and current slew-rate control to avoid pressure drops and fuel diversion during turboprop transients.

A two-stage planetary gearbox extends propeller pitch beyond 90° to enable thrust reversal and flexible thrust profiles.

A reinforced cavity core with lattice or shell supports and elastomer damping helps composite turbomachine vanes stay light while resisting resonance.