Propellers TRIZ Cases

A stationary pump and rotating hydraulic transfer unit reduce aircraft engine module size.

A mechanical rotor coupling adjusts blade angle from drive torque, supporting quieter, more efficient multicopter flight.

A feedback controller combines requested oil flow with leakage compensation to stabilize variable-pitch propeller speed control.

This case positions the hybrid turboprop air inlet axially and asymmetrically to reduce drag and preserve motor and gearbox space.

Nonuniform outlet guide vane spacing reduces turbofan interaction noise.

Spring-loaded hinges and centrifugal force automatically fold UAV propellers for storage and extend them for flight without manual handling.

Separate actuator and surface sensors compensate for drive-train nonlinearity while enabling continuous sensor-failure detection.

Non-constant airfoils and lift coefficients across blade sections improve efficiency while reducing torque and noise.

This case shows how a spring-loaded brake pad holds an unpowered propeller stationary, then disengages automatically to avoid flight drag.

This case uses pivoting trailing edges and centrifugal force to seal variable-pitch blade gaps and preserve core airflow.

Pivotable guide vane sections adapt airflow and support thrust recovery in open rotor propulsion.

A magnet and Hall sensor detect two blade-pitch states, supporting hovering, forward flight, and vertical takeoff.

Radial passages and diverging-converging duct sections improve thermal transfer without enlarging the propulsion inlet duct.

Counter-rotating rotors and brushless toroidal motors preserve aircraft architecture while supporting quieter, flexible hybrid propulsion.