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Patent for License:

Light Weight High Performance Propeller/Rotor    

A much lighter, more efficient, less expensive and entirely new structural design.


The design of this propeller consists of a carefully engineered hollow blade shell of carbon fiber and a carbon fiber spar that is shaped like an I-beam. The spar extends from blade tip to blade tip. The blade is rigidly attached to the spar only at the outer third of the blade. The pitch links attach to the blade shell at the root. As the pitch links rotate the rigid blade shell to change propeller pitch, the unattached portions of the I-beam spar twists inside the hollow propeller blade. It twists in the flat wise direction. The blade is hollow and light yet strong enough to permit a blade shape that more closely approaches the optimal shape of a propeller (very wide root and marked scimitar tip). The pitch change mechanism takes advantage of the composite bending attributes which will not fatigue during the life of the propeller. The high centrifugal forces are easily carried by the spar in tension.

The propeller can be designed for either pusher or tractor applications of any diameter, engine HP or cruise speed. The propeller and controller can (and should) be matched to the engine so that the package will optimize the propulsion efficiency for the operating envelope of the target aircraft or application. The design lends itself to electronic pitch control that optimizes performance using multiple input parameters i.e. forward airspeed, engine torque and density altitude.

Primary Application of the Technology

The technology should add value to any application where it is necessary to move air. I.e. propellers, helicopter rotor blades and wind turbine blades.

All propeller aircraft could demonstrate significantly improved take off and climb performance with this propeller technology without increasing hp.

Frequently Asked Questions

Testing and Certifications/Validation:

Propellers using this technology have been extensively tested on test stands and in flight. Three different sizes of propeller have demonstrated the scalability of the design:

A 100 in (8-4") for a 400hp engine has documented 1855 lbs of static thrust on 380 hp (figure of merit of 0.79) and 1275 lbs of thrust on 193 hp (figure of merit 0.88). Similar proportional performance has been documented on a 28 inch propeller for a 40 hp UAV engine and a 60 inch propeller for a 65 hp two cycle engine.

Rotors using this technology have also been tested and flown. A 45 ft rotor has flown a 4000 lb rotorcraft and a 26 ft rotor has flown a 700 lb rotorcraft.

The propellers and rotors are not FAA certified at this time.

Patent Summary

U.S. Patent Classes & Classifications Covered in this Patent:

Class 244: Aeronautics And Astronautics

Machines or structures adapted to be: completely or partially sustained by the air (e.g., winged aircraft, helicopters, parachutes, kites, balloons, etc.); propelled and guided or stabilized through the air (e.g., projectiles with fins, guided missiles, etc.); placed in an orbit or which substantially operate outside the earth"s atmosphere (e.g., satellites, space vehicles, etc.); or subcombinations of these machines or structures.

Subclass 17.11: Helicopter or auto-rotating wing sustained, i.e., gyroplanes
Subclass 17.25: Lifting rotor having lift direction varying means
Subclass 17.27: Lifting rotor supports, e.g., pylons
Subclass 8: Airplane and auto-rotating wing sustained

Class 416: Fluid Reaction Surfaces (I.E., Impellers)

This class provides the locus for all fluid impellers not elsewhere classifiable. The working fluid, which is acted on by or acts upon the impeller, may be a liquid or gas.

Subclass 134A: Aircraft rotors
Subclass 138: With manual control means
Subclass 139: Including weight bias means
Subclass 141: Plural articulation
Subclass 148: Tiltable carrier (e.g., hub, etc.)
Subclass 168R: Link connection to working member
Subclass 226: Formed with main spar
Subclass 228: Tined or irregular periphery
Subclass 230: Wire, fiber, strand or fabric
Subclass 231R: Apertured or permeable
Subclass 238: Cantilever blade
Subclass 245R: Spinner or fairwater cap
Subclass 27: Pitch adjustment and throttle regulation with condition sensing means
Subclass 28: Temperature responsive control
Subclass 30: Electrical control or sensing means
Subclass 35: With electrical means comparing and reducing error related to preset datum
Subclass 36: Plural diverse condition responsive
Subclass 37: Relative ambient condition sensing (e.g., temperature, density, wind force, etc.)
Subclass 39: Temperature or icing condition responsive
Subclass 40: Responsive to relative working fluid velocity
Subclass 42: Pressure or altitude responsive
Subclass 44: Impeller rotation speed responsive
Subclass 47: Control by means of separate motor

Class 415: Rotary Kinetic Fluid Motors Or Pumps

This is the class for apparatus, and corresponding methods of operating such apparatus, comprising a runner, and in which a working fluid is guided to, around, or from, the runner. A means for guiding or confining, the working fluid must be present. This class includes typically turbines, wind and water wheels, centrifugal pumps and blowers; and such casings, conduits, guide means and other elements peculiar to the subject matter of this class not otherwise classifiable.

Subclass 124.1: Runner supported portion engages shaft transmission train (e.g., peripheral gear drive, etc.)

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