Rotary Propellers TRIZ Cases

Segmenting the motor and bearing reduces shroud volume and drag while maintaining propulsion efficiency for underwater vehicles.

Segmented hub caps with external connection rings eliminate vortex energy loss while enabling accessible installation on controllable pitch propellers.

Shot peening extends compressor wheel service life by imparting compressive residual stresses to fatigue-prone surfaces.

Pre-swirl stators create counter-rotating swirl flow to reduce propeller wake resistance while the arc duct generates additional thrust.

Rotating shielding portions adjust exhaust volume without replacing static plugs, eliminating plug loss and reducing inventory costs.

True hydrofoil shapes maintain laminar flow, reducing drag and cavitation across varying speeds.

A combined propeller cap structure reduces hub vortex cavitation through integrated contraction and diffusion sections.

A single push button switch with an operation processor detects pressing modes to control ship-mounted equipment and power supply states.

Flow holes in propeller blades discharge or suction water to eliminate blade tip vortex cavitation, reducing underwater noise and vibration.

An elastomeric bushing limits axial displacement in the propeller hub, preventing noise generation from shaft misalignment across different motor brands.

A flap intercepts the wake wave to adjust propeller immersion depth at lower speeds.

Pultruded spar cap profiles guide shear web placement and maintain bond gaps for adhesive distribution.

An asymmetric pre-nozzle with internal fins conditions uneven wake flow via pre-swirl, reducing energy losses and improving propulsion efficiency.

Asymmetrical flexbeam roots reduce virtual flapping hinge distance below 7% of rotor disc radius, lowering harmful moments and natural flapping frequency.

A link-type operation mechanism reduces device complexity by replacing multiple hydraulic cylinders with one actuator to control tilt and trim angles.

An integrated stiffening structure merges axial securing functions, reducing manufacturing complexity while maintaining structural integrity.

A controller detects sustained propeller shaft oscillations to adjust torque commands and mitigate parasitic vibrations.

Spring-loaded gates open for thrust and close for protection, preventing cavitation and damage.

Blade duct openings channel high-pressure fluid to reduce cavitation damage and underwater radiated noise.

A titanium alloy composition increases tensile strength by 100 MPa over Ti 6-4 while maintaining density and ductility.

Offset mass distribution generates centrifugal opening forces, reducing weight and vibration in marine propulsion systems.

A marine propulsion control device acquires engine torque and hull speed alongside rotation data to determine ventilation occurrence.

Pressurized gas channels displace water in rotating gaps, cutting friction losses by a factor of 800 and improving propulsion efficiency.

A peller blade with a movable flap converts rotational energy into translational force to drive water flow.

A laser displacement sensor measures propeller blade geometry via servo-controlled movement along linear and curved axes.

A vertical drive shaft lowers the propulsion unit near the hull bottom.

A spline-coupled bushing with a hollow shaft member and elastic damper absorbs shock loads through a breakable portion to prevent power transmission damage.

Varied stator blade shapes route a motor drive belt through the pump, enabling shallow water operation on vessels lacking recessed inlet ducts.

A boat propeller shaft sleeve uses a rubber shock-absorbing member to dampen vibrations during rotation.

Internal screw attachment eliminates external feet, reducing hub diameter while maintaining torque transmission via oil pressure interference fit.

Segmented frame design resolves launch stability versus lift effort contradictions by allowing hull removal for reduced weight and drag.

A marine vessel with selectively deployable hull members transforms between catamaran, SWATH, and barge configurations.

A coaxial propeller device synchronizes front and rear blade rotation through pitched seating surfaces and resilient locking elements.

Dual fins on a pulling pod unit generate lateral forces to reduce azimuthal torque and recover rotational energy losses.

Polymer hubs with galvanic anodes reduce moment of inertia and corrosion in marine environments, maintaining structural integrity.

Holes in an upper duct plate merge vortices and prevent sink vortex generation, restoring lateral hull accuracy.

A mechanically-adjustable pitch propeller hub uses a linear actuator to rotate blades for thrust control.

Lower rear handle placement shifts weight distribution, allowing extended arm posture and reducing strain during transport.

Resilient inserts in a propeller hub adaptor absorb shock and reduce gear noise at low revolutions while maintaining adaptability across motor brands.

Tapered and scalloped ribs maintain open feed paths during casting to eliminate porosity defects from premature solidification.

Detachable hull modules interconnect to form a stable, adaptable recreational platform.

An acceleration nozzle with internal fins reduces swirl losses in fixed-pitch propellers, cutting propulsion power requirements by up to 9%.

A small duct positioned close to a propeller with decreasing pitch optimizes radial load distribution.

A marine engine propelling apparatus with a linear power transmission route and height adjustment mechanism.

Pretwisted turbine blades coupled via friction elements absorb operational twisting forces.

Rotating thrusters replace fixed units to resolve maneuverability complexity trade-offs in harsh environments.

A marine transmission gearbox cooler uses a plastic housing and metal heat sink to transfer heat efficiently.

Outer fins on a fore-nozzle generate pre-swirl to improve propeller inflow efficiency.

A two-shell adaptor seals the gap between the motor housing and propeller, preventing weed migration that causes heat buildup and power drain.