71404 ⎘
Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction; Propellers; Hubs; Blade connections the blades being foldable automatically foldable or unfoldable
Folding Propeller for a Water Vehicle
#2Folding propeller and methods of use
#3Folding propeller
#4Propeller
#5Surfboard booster system
#6Improvements to a propeller
#7Variable hybrid catamaran air cushion ship