71939 ⎘
Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft Variable-diameter propellers; Mechanisms therefor
Propeller control system of air mobility
#2Propeller safety device
#3Passive tip gap management systems for ducted aircraft
#4Aircraft turbine engine with a pair of rotating and non-ducted propellers
#5Convertible propeller
#6Rotor or propeller blade with dynamically variable geometry and other properties
#7Aerial vehicle with different propeller blade configurations
#8Aerial vehicle propulsion mechanism with coaxially aligned and independently rotatable propellers
#9Telescoping propeller blades for aerial vehicles
#10Aerial vehicle propulsion mechanism with coaxially aligned propellers
#11Aerial vehicle adaptable propeller blades
#12Adaptative wind turbine
#13Collapsible airfoil spooled retractable rotor
#14Optimization of downstream open fan propeller position and placement of acoustic sensors
#15Disc rotor retraction system
#16Propeller arrangement
#17Optimization of downstream open fan propeller position
#18Variable-diameter rotor with centrifugal forces compensation mechanism
#19Propeller with Flexible Variable Blades
#20Methods and apparatus for adjustable surfaces
#21Methods and apparatus for adjustable surfaces
#22Methods and systems for starting propeller-driven devices
#23Propeller sound alteration for a drone
#24Drone noise reduction