Aircraft having a helicopter rotor and an inclined front mounted propeller

• US 20070095973A1
• Filed: 10/27/2005
• Published: 05/03/2007
• Est. Priority Date: 10/27/2005
• Status: Abandoned Application

• Current Assignee: Douglas Challis
• Original Assignee: Douglas Challis
• Inventors: Challis, Douglas
• Application Number:
  US11/259,353
• Publication Number:
  US 20070095973A1
• Time in Patent Office: Days
• US Class Current: 244/17.21
• CPC Class Codes: B64C 27/08 with two or more rotors
• CPC Class Codes: B64C 27/22 Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft

Abstract

An aircraft features a nose mounted propeller on a fuselage having a typical helicopter rotor assembly. The propeller axis of rotation is tilted upward from the longitudinal axis of the fuselage so that its rear face points downward. By reducing the amount of lift and forward thrust needed from the main rotor, the propeller allows greater forward speeds as the angle of attack on the rotor'"'"'s blades can be kept low to avoid the stalling and violent vibration experienced by conventional helicopters at relatively high speeds. By greatly reducing the amount of thrust produced by the main rotor but still using it to generate lift, the addition of wings can be avoided. The aircraft can be flown in a forward direction in a generally horizontal orientation, as the nose does not have to be pitched downward to create thrust from the main rotor.

Claims

1. An aircraft comprising:

a fuselage having a front end, a rear end and a longitudinal axis;

a main helicopter rotor supported for rotation about an axis thereof on top of the fuselage, said rotor being operable to control both vertical and horizontal movement of the aircraft;

a propeller supported for rotation about an axis thereof at the front end of the fuselage for selectively producing thrust to move the aircraft forward; and

at least one powerplant supported on the fuselage;

the main rotor and propeller each being operatively connected to the at least one powerplant for selective driven rotation thereby;

wherein vertical lift of the aircraft is provided substantially wholly by the main helicopter rotor;

the propeller being supported for rotation in a plane transverse to the fuselage, said plane being inclined with respect to the longitudinal axis of the fuselage so as to extend upward from front to rear with said longitudinal axis horizontally oriented.

2. The aircraft according to claim 1 wherein the at least one powerplant comprises a propeller powerplant and a rotor powerplant, the propeller and main helicopter rotor being operatively connected to the propeller and rotor powerplants respectively.

3. The aircraft according to claim 1 wherein the at least one powerplant comprises a common powerplant having a rotor output and a propeller output, the propeller and main helicopter rotor being operatively connected to the propeller and rotor outputs respectively.

4. The aircraft according to claim 1 wherein the propeller is adjustable in pitch.

5. The aircraft according to claim 1 wherein the propeller is pivotally mounted to allow adjustment of an angle at which the transverse plane in which said propeller rotates is inclined with respect to the longitudinal axis of the fuselage.

6. The aircraft according to claim 1 wherein the at least one powerplant comprises a propeller powerplant and a rotor powerplant, the propeller and main helicopter rotor being operatively connected to the propeller and rotor powerplants respectively, said propeller and propeller powerplant being pivotally mounted to adjust an angle at which the transverse plane in which said propeller rotates is inclined with respect to the longitudinal axis of the fuselage.

7. The aircraft according to claim 1 wherein the propeller is adjustable in pitch an is pivotally mounted to adjust an angle at which the transverse plane in which said propeller rotates is inclined with respect to the longitudinal axis of the fuselage.

8. The aircraft according to claim 1 wherein the propeller is adjustable in pitch and the at least one powerplant comprises a propeller powerplant and a rotor powerplant, the propeller and main helicopter rotor being operatively connected to the propeller and rotor powerplants respectively and said propeller and propeller powerplant being pivotally mounted to adjust an angle at which the transverse plane in which said propeller rotates is inclined with respect to the longitudinal axis of the fuselage.

9. The aircraft according to claim 1 further comprising a torque countering device for countering a torque reaction exerted on the fuselage about the axis of the main helicopter rotor caused by driven rotation of said rotor.

10. The aircraft according to claim 9 wherein the torque countering device comprises a tail rotor supported for rotation in generally vertical plane parallel to the longitudinal axis of the fuselage rearward of said fuselage.

11. The aircraft according to claim 1 further comprising a vertical stabilizer supported rearward of the fuselage.

12. The aircraft according to claim 1 further comprising a horizontal stabilizer supported rearward of the fuselage.