Propellers TRIZ Cases

Rotatable paired thrusters shift between hover and forward flight to limit rotor downwash effects while adding anti-torque thrust control.

A rotatable inner frame and varying elastomer stiffness let one disk absorber be tuned on-site for different vibration frequencies and directions.

Elastic restoring force secures onboard electrical components while keeping the attachment structure thin for better cooling and less airflow interference.

A rotating auxiliary hydraulic circuit stores pressure for rapid blade feathering when the main oil transfer supply fails.

An electric motor, planetary gearset, and lead screw replace hydraulic pitch control to save hub space and avoid fluid leakage.

An axial lip-and-spring seal keeps rolling bearings compact and leak-tight under centrifugal loads without extra retaining parts.

Real-time sound quality feedback guides drone distance to improve audio capture while maintaining a safe position from the sound source.

Real-time flight condition sensing and effector coordination reduce aerodynamic and structural loads while preserving aircraft control.

A pivoting dual-rotor lift layout cuts motor count and assembly complexity while improving stability, speed, and flight time.

A dual FMA channel decelerates, pressurizes, then re-accelerates flow to cut low-speed wave drag without large heavy ducts.

A torsion bar and hydraulic damper smooth torque peaks and suppress start-up resonance in aircraft propeller drives for stable engine operation.

Variable pump displacement matches fan blade load, cutting continuous high-pressure losses and leaks in turbojet pitch control.

A screw-driven control tube inside the rotor hub replaces external pitch links, reducing mast length, lost motion, and stiffness loss.

A stationary pump and rotating transfer unit deliver hydraulic fluid to variable vane actuators while cutting module weight and power use.

A tapered bushing bore and matching fastener surface create a widening gap that lowers local interface stress in structural joints.

Two electric machines driven by parallel intermediate gear lines balance turboprop loads while adding electrical power without enlarging the gearbox.

A shared electrical bus links lift and tilt propellers across wings, cutting wiring weight while preserving fault-tolerant eVTOL control.

Sensor-based state estimation and repulsion field control help manned VTOL aircraft avoid obstacles while preserving pilot input.

Tiltable proprotors and a central autorotating rotor enable VTOL, stable mode transitions, and more efficient forward flight without a runway.

A VTOL UAV carries hydrogen at up to 30 bar to cut compression infrastructure needs and reach remote delivery points autonomously.

A three-state hydraulic valve blocks fine-chamber flow and pressurizes the coarse chamber to preserve feathering after seal failure without added weight.

A controller-tuned dampening device creates opposite-phase vibrations in the actuator path to keep tail-rotor vibration out of the fuselage.

Flexible self-retaining wear-pad geometry simplifies spherical bearing assembly while limiting rotation, wear, and component clashes.

Real-time HUD cues combine weapon orientation, target vectors, and ballistic data to speed target switching and improve shot placement.

Two multi-axis sticks and a flight control computer remove cross-coupling, keeping VTOL control intuitive from hover to forward flight.

A decoupled two-stick VTOL control scheme keeps pilot inputs consistent from hover to forward flight, reducing workload and training time.

Resiliently mounted elevons and fuselage actuators improve UAV pitch, roll, and yaw control while enabling coordinated surface deflection.

Stored hydraulic fluid in the rotating frame keeps turbine blades featherable if the main supply or transfer bearing fails.

A seal-free plain bearing with rolling bearings on both sides controls oil leakage, misalignment, and wear in variable-pitch fan modules.

Electronic signal control replaces mechanical linkages in a free propeller assembly, enabling full blade rotation, higher agility, and lower noise.

Friction-welded bearing races are induction hardened to resist wear while preserving corrosion resistance in propeller blade retention elements.

Two electric machines driven by parallel reducer lines balance loads and raise electrical power capacity without enlarging the stator housing.

Offset pinion axes and parallel transmission lines integrate an electric machine into a turboprop speed reducer without added bulk.

Tailplane-mounted propulsors re-accelerate downwash into slipstreams, boosting tail lift at low speed without larger, draggier surfaces.

A portable GPS-guided beacon uses rotors and onboard feedback to hover at fixed coordinates and provide longer emergency visual or radio signals.

Curved overhang and elliptic airfoil surfaces keep airflow attached around trailer edges, cutting drag and reducing wake voids.

Deployable blade sections raise drag-generated torque so UAVs can maintain control and land safely during motor-out conditions.

Pivoting engine modules shift thrust from lift to cruise, helping VTOL aircraft gain speed and range with lower noise and infrastructure needs.

When thrust or tilt limits are reached, translational commands are reduced so aerial vehicles can preserve rotational control and flight stability.

Fuselage-mounted effectors and resilient trailing edges coordinate elevons and rudders for stable UAV pitch, roll, and yaw control.

A VTOL UAV carries hydrogen at up to 30 bar, avoiding costly compression or pipeline infrastructure while enabling flexible point-to-point delivery.

Gradual hydraulic drainage during feathering smooths propeller pitch change, limiting thrust and rolling-force spikes that impair aircraft control.

A keystone-style clamping ring and nut remove mounting clearance in a turbomachine fan hub blade pivot, preventing wear and uneven load paths.

A solenoid and spring-biased locking pin secures the propeller without continuous power, reducing wear, drag, and windmilling risk.

A passive blocking unit fixes movable aircraft components at defined positions during power loss while avoiding clutch complexity, drag, and lift loss.

Three independent rotor modules and coordinated tilt-speed control keep transition flight stable, cut power use, and retain control after rotor failure.

Null-space projection lets aircraft actuators handle secondary tasks without disturbing primary torque and thrust control.

A ring-gear-blocked epicyclic gearbox cuts moving parts, weight, and lubrication needs while reducing turbine speed for aircraft rotors.

Rate sensors and lag compensation estimate rotorcraft attitude for stable fly-by-wire control across hover and cruise transitions.

Two multivariable correctors manage fuel flow and propeller pitch saturation to preserve decoupling and prevent turbomachine overshoot.