Rotocraft TRIZ Cases
- Rotor Mast Bearing Restraint Using Groove Collar Retention
A groove collar and retaining ring replace threaded mast coupling to restrain radial bearings and reduce rotor mast fatigue risk.
- Tunable Blade Assembly With Adjustable Mass for Resonance Control
An adjustable mass inside a blade cavity shifts natural frequency to curb resonance, extend structural life, and improve comfort.
- Pitch-Lag Rotor Hinge for Back-EMF-Limited VTOL Response
A pitch-lag hinge lets rotor blades auto-adjust pitch during lag, cutting back EMF impact while improving thrust, torque, and VTOL response.
- Four-Bar Flapping Rotor Hub to Limit Lead-Lag Vibrations
A four-bar rotor hub shifts the blade’s instantaneous rotation to suppress lead-lag vibration while reducing hub weight and damper size.
- Rotor Blade Retention Assembly for Compact Hub Removal
A tension-torsion strap lets rotor blades be removed without hub top plate disassembly while reducing hub radius, weight, and drag.
- Tail Boom Duct Shroud Airfoil Profile for Forward-Flight Drag
Airfoil-shaped shroud sections on a rotorcraft tail boom cut forward-flight duct drag while preserving counter-torque thrust.
- Universal Rotor Blade Spar for Multi-Aircraft Manufacturing
A constant-height spar and adaptable root let one rotor blade fit multiple aircraft models while cutting tooling cost and factory space.
- Collapsible Rotor Blade Assembly for Compact Crash-Resistant UAVs
Torsion-spring rotor blades fold toward the body at low speed, cutting landing damage, storage bulk, and blade cost while preserving lift.
- Helicopter Pitch Change Assembly With Single-Bearing Flexible Rod
A flexible rod and single bearing replace multiple large bearings in helicopter pitch controls, cutting weight, parts, and cost.
- Hovering Aircraft Rotor Pitch Control Without Speed Change
A threshold-triggered hub and control element adjusts blade pitch to vary counter torque without changing rotor speed, reducing noise and energy loss.
- Helicopter Vertical Tail Concavity for Tail Rotor Anti-Torque
A concave vertical tail and spoilers reduce tail rotor side-wash interference, cutting anti-torque energy use and improving hover stability.