Propellers TRIZ Cases

A ducted contra-rotating fan system generates torque-neutral thrust for vertical take-off and landing operations.

A ducted rotor duct integrates spars and ribs to minimize weight.

A turbine spacer with retention flanges manages gas flow and acts as a friction damper.

Segmented airfoil trailing edges with wave-shaped projections generate counter-rotating vortices to mix downstream wake flow.

Environmental barrier coatings with CMAS mitigation capability prevent chemical interaction and material loss in gas turbine engine components.

Stationary subdividing disc creates self-pressurizing hydrodynamic bearings using peripheral restrictive means.

A hybrid wind turbine blade combines an epoxy prepreg structural box with a polyester infused shell joined by specialized adhesive.

A nested damper-seal assembly seats against blade platforms using centrifugal force to maintain a positive seal during engine rotation.

Dielectric barrier discharge plasma actuators prevent boundary layer separation at low Reynolds numbers, reducing noise and power consumption.

A turbomachine fan uses a waveform leading edge on airfoils to enhance aerodynamic efficiency.

A composite turbine rotor wheel uses a variable-diameter spring ring to maintain radial abutment against an orientation disk during operation.

A rotary hydraulic actuator uses fluid port interconnection to control blade pitch angles.

Asymmetrical fan wheel plates stabilize circumferential flow distributions, reducing aerodynamic losses and noise emission from irregular pressure patterns.

Spiral blade folding reduces aerodynamic drag during airplane mode, while airbags prevent nacelle contact to enable higher forward speed.

Inverting spring placement reduces overhung mass and increases natural frequency separation.

Segmented spinner portions move blades along a longitudinal axis to reduce drag while maintaining thrust capability.

Emergency power supply mechanism generates electricity from rotor rotation to drive pitch control, eliminating battery maintenance needs.

Plasma actuated cascade arrays induce directional airflows over rotorcraft blades using stacked electrode-dielectric layers.

Adjustable nozzles on a single drive unit direct air jets to enable vertical take-off and horizontal movement without rotary elements.

Different rotor geometries prevent constructive interference of acoustic signatures while maintaining equivalent thrust and simplified control systems.

Segmented aerodynamic devices manage low frequency high amplitude loads with a first device and high frequency low amplitude loads with a second device.

A fluidic cylinder uses a single routing device to balance chamber pressures and inhibit blade excursion.

A detachable plate with a serpentine channel connects high and low pressure coolant regions within the turbine rotor blade platform.

Curved propeller blades reflect RF waves to create high-gain directional antennas, overcoming low gain limits in small UAVs.

Offset blade portion with reinforcing ribs distributes stress concentration at the root, preventing metal fatigue and blade detachment.

Propeller pitch control system maintains blade angles within defined thrust and torque envelopes, preventing mechanical degradation from excessive loads.

A control system calculates impeller remaining life using speed and temperature sensor data to trigger maintenance warnings.

An aerially distributable communications device uses gyrochute autorotation to stabilize descent and deploy wireless mesh networks in disaster zones.

A rotary blower uses interchangeable inserts to modify the radial section of its annular conduit for versatile fluid handling.

Segmented rotors use beamforming to cancel acoustic radiation while maintaining thrust generation.

Involute sidewalls maintain constant interwall distance in diffuser channels, resolving manufacturing precision trade-offs while expanding compressed airflow.

Sacrificial filler decomposes during foreign object impact, preventing cover separation and maintaining engine windmilling capability.

A fan-powered folding wing bicycle integrates a ducted turbine engine with pivotable wings for novelty and transportation.

Dynamic sound flaps on adjustable propellers generate anti-sounds to cancel aerial vehicle noise while maintaining aerodynamic performance.

An asymmetrical nacelle circumscribes the fuselage to ingest boundary layer air from the upswept tail section.

A turbine bucket platform defines a dedicated cooling passage between the main circuit and the pressure side face to enhance heat removal efficiency.

A planetary gear set transmits rotary input into counter-rotating outputs via a carrier and ring gear arrangement.

Segmented rings with spring-loaded seats and outer sleeves resist centrifugal expansion to prevent lug disengagement.

A passive adaptive airfoil structural insert with buckling members deflects nonlinearly to mitigate gust loads.

Embedded carbon fiber networks form electric circuits in rotating blades to detect structural anomalies during operation.

Segmenting the fan into independently rotating stages allows the aft stage to increase pressure ratio without exceeding mechanical limits of the engine core.

A hub-mounted airfoil body adjusts position relative to rotor blades to increase aerodynamic lift at the inner blade section.

An enclosed pumping chamber in a turbine rotor cover plate delivers cooling air to the central web, avoiding stress concentrations from tight spacing.

A wind turbine control method stores past control values to calculate an alert parameter based on signal variations.

Nested plates clamp stator vanes to pivots, reducing radial dimensions while protecting roots from damage.

A safety rotor system uses deceleration detection to stop flight rotors before impact.

Segmented metallic platforms with frangible wings reduce manufacturing complexity and foreign object damage risks.

A wireless control device manages rotor blade bearing orientation during assembly without altering existing hydraulic cabling.

Segmenting the drive mechanism into a nested module preserves structural integrity while eliminating drag from external hydraulic connections.

Segmenting power delivery into two coaxial motors reduces nacelle diameter and wing moment while improving cooling access.