Reverse velocity rotor and rotorcraft
Abstract
Abstract A ROTARY WING AIRCRAFT AND ROTOR CONTROL SYSTEM FOR SUCH AIRCRAFT, WHICH USES THE REVERSE VELOCITY AIRFLOW PRODUCED BY HIGH AIRSPEEDS OF THE AIRCRAFT ACROSS THE RETREATING BLADE TO GENERATE POSITIVE LIFT ON THE RETREATING BLADE. BLADE PITCH CONTROL MEANS AND METHOD FOR SUCH AIRCRAFT PROVIDING A TWO/REVOLUTION, CAM OR HIGHER ORDER CYCLIC PITCH INPUT TO GENERATE MORE UNIFORM LIFT IN THE ADVANCING AND RETREATING BLADE SECTORS OF ROTOR MOTION. A MAIN ROTOR FOR SUCH AIRCRAFT HAVING A NEW AIRFOIL SHAPE ADAPTED TO MORE EFFICIENTLY GENERATE POSITIVE LIFT FROM THE REVERSE VELOCITY AIRFLOW, AND ALSO HAVING SLOTTED FLAPS OR OTHER AUXILIARY LIFT DEVICES FOR INCREASING LIFT AT LOW AIRCRAFT AIRSPEEDS. A TWISTABLY-MOUNTED TAIL ROTOR FOR SUCH AIRCRAFT ADAPTED FOR COUNTER-TORQUE OPERATION AT LOW AIRCRAFT AIRSPEEDS AND FOR FORWARD PROPULSION AT HIGH AIRSPEEDS.
Inventors
- 👤 Harold E Lemont
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |