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8162253 |
Convertible vehicle for road, air, and water usage
A convertible combined road, water, and aircraft vehicle has a road form, a water form, and an aircraft form. The vehicle includes a vehicle body having a passenger compartment and wheels...
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8157203 |
Methods and apparatus for transforming unmanned aerial vehicle
Methods and apparatus for a transforming aerial vehicle according to various aspects of the present invention may operate in conjunction with a launch system configured to rotate the aerial vehicle...
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8070089 |
Hybrid helicopter that is fast and has long range
A hybrid helicopter (1) includes a central fuselage (2) defining a front end (3) and a rear end (4), the hybrid helicopter (1) having a main lift rotor (10), an additional lift surface (20), a...
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8066219 |
Anhedral tip blades for tiltrotor aircraft
A tiltrotor aircraft having a fixed wing and tilting rotors has a rotor blade with a shaped tip portion that provides improved hover performance. The shaped tip portion preferably has a terminal...
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8020803 |
Rotorcraft engine and rotor speed synchronization
Systems and methods are provided in which an electrical control system independently effects acceleration of both driven and driving elements of a clutch to engage each other. In preferred...
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7930074 |
Vertical speed and flight path command module for displacement collective utilizing tactile cueing and tactile feedback
A flight control system includes a collective position command module for a lift axis (collective pitch) which, in combination with an active collective system, provides a force feedback such that...
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7918415 |
Convertible aircraft operating method
The invention relates to a convertible aircraft operating method. According to the invention, the aircraft comprises: a fuselage, standard fixed wings which are equipped with ailerons, a tail unit...
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7873445 |
Governor for a rotor with a variable maximum collective pitch
A governor configured to regulate the rotational velocity of one or more rotors of an aircraft by adjusting a collective blade pitch of the one or more rotors. In one embodiment, the governor...
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7866598 |
Rotorcraft engine and rotor speed synchronization
Systems and methods are provided in which an electrical control system independently effects acceleration of both driven and driving elements of a clutch to engage each other. In preferred...
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7857252 |
Rotor/wing dual mode hub fairing system
A hub fairing system (12) for a stopped-rotor aircraft (10) having a fuselage (14) including a hub (16). The hub (16) is mechanically coupled to the fuselage (14) and to multiple blades (40) and is...
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7753309 |
VTOL/STOL tilt-prop flying wing
An aircraft comprises two wings, a fuselage, a tail planform and a pair of counter-rotating propellers. The two wings are located at a longitudinal center of gravity of the aircraft. The fuselage...
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7681832 |
Ducted fan air vehicle with deployable wings
A ducted fan air vehicle and method of operation is disclosed for obtaining aerodynamic lift and efficiency in forward flight operation without significantly impacting hover stability. One or more...
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7611090 |
Reaction-drive rotorcraft having an adjustable blade jet
Rotorcraft including an airframe having a fuselage extending between a forward and an aft end and a powerplant producing high-pressure fluid. The rotorcraft includes a rotor assembly rotatably...
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7584923 |
Tilt-rotor aircraft
A tilt-rotor aircraft (1) comprising a pair of contra-rotating co-axial tiltable rotors (11) on the longitudinal center line of the aircraft. The rotors (11) may be tiltable sequentially and...
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7571879 |
Automatic conversion system for tiltrotor aircraft
One embodiment of the present invention is a method for automatically controlling the conversion of a tiltrotor aircraft. An airspeed command for the tiltrotor aircraft is received. The airspeed...
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7434763 |
Rotor/wing dual mode hub fairing system
A hub fairing system (12) for a stopped-rotor aircraft (10) having a fuselage (14) including a hub (16). The hub (16) is mechanically coupled to the fuselage (14) and to multiple blades (40) and is...
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7188802 |
Convertible aircraft provided with two tilt fans on either side of the fuselage, and with a non-tilting fan inserted in the fuselage
The present invention relates to a convertible aircraft provided with first and second tilt fans disposed on either side of the fuselage a little forward of the center of gravity of the convertible...
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7147182 |
Gas-powered tip-jet-driven tilt-rotor compound VTOL aircraft
A tilt-rotor compound VTOL aircraft has a multiple-flow thrust generator(s) comprising a gas-powered tip-jet driven rotor(s) having a thrust-augmentation ratio of at least two; that tilts about the...
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7143973 |
Avia tilting-rotor convertiplane
The present invention provides a tilt rotor aircraft having a centrally mounted tiltable engine and rotor assembly. A turbine or other type of engine (or engines) is pivotally mounted on a central...
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7070145 |
Tailboom-stabilized VTOL aircraft
A disclosed flying craft includes a suspension structure having a first end and a second end, a lift unit, and a payload unit. The lift unit includes a nacelle and a tailboom, and pivotally couples...
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7014142 |
Low-drag rotor/wing flap
Rotor/wing aircraft having a low-drag flap are disclosed. In one embodiment, a rotor/wing aircraft includes an elongated blade having a body portion and a flap portion. The body portion has first...
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6978970 |
Aircraft with foldable tail assembly
A foldable tail assembly for an aircraft includes a stabilizer and a pair of right and left fins mounted with respect to the stabilizer so that the fins may lay flat over the stabilizer during...
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6974105 |
High performance VTOL convertiplanes
A single-tilt-rotor VTOL airplanes have a tiltable rotor attached to an elongated power pod containing the collective and cyclical pitch mechanism, and transmission. The power pod is pivotably...
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6885917 |
Enhanced flight control systems and methods for a jet powered tri-mode aircraft
A method of stabilizing a jet-powered tri-mode aircraft as the aircraft travels in a helicopter mode, a compound mode, and a fixed-wing mode is disclosed. The method includes receiving a plurality...
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6868315 |
Flight control system for controlling the pitch of an aircraft with vertical takeoff and with an orientable lift direction
A flight control system for controlling the pitch of an aircraft having a vertical takeoff capability and an orientable lift direction may include a first device, to which a pitch command...
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6863241 |
Control of an aircraft as a thrust-vectored pendulum in vertical, horizontal and all flight transitional modes thereof
An improved aircraft includes a thrust source, a wing, and a boom functioning as a “free lever” and having a distal end upon which the thrust is acting and a proximal end about which the boom is ...
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6863242 |
Method and system for controlling an aircraft control surface
A system for controlling an aircraft control surface may include a control surface having at least two control surface elements mounted to rotate about an axis on a stabilizer element of the...
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6845941 |
Rotary/fixed wing aircraft
A rotor system that allows an aircraft to operate as a helicopter and as an airplane is disclosed. The invention incorporates an annular airfoil attached at the tips of the rotor blades. The rotor...
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6830215 |
Pivoting transmission unit with a device to take up play along the pivot axis
A pivoting power transmission unit is provided for transmitting rotational drive to a rotor configured to revolve about an axis of rotation and configured to be swivelled about a pivot axis...
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6824096 |
Device for controlling the pitch of the blades of a convertible aircraft rotor
A pitch control device for a blade of a tilting rotor of a convertible aircraft. The pitch control device is external to a rotor hub which is driven in rotation by a mast and connected to the...
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6719244 |
VTOL aircraft control using opposed tilting of its dual propellers or fans
The invention relates to improvements with regards to the control of VTOL aircraft that use two propellers or fans as the primary lifting devices in hover. More particularly, the invention is a...
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6695254 |
Rotary-wing aircraft rotor with constant velocity drive
A tilting rotor of a convertible aircraft comprises, between the mast and the hub, a constant velocity drive mechanism and pivoting arrangement comprising two gimbals, each of which is driven by...
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6676073 |
Pivoting power transmission unit with peripheral face toothed gearwheels of the face gear type
A pivoting power transmission unit is provided for transmitting rotational drive from a power source to a rotor configured to revolve about a first axis and configured to swivel about a second axis...
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6669137 |
Air vehicle having rotor/scissors wing
An air vehicle, such as a manned or unmanned air vehicle, has a fuselage, a rotor/scissors wing, and a scissors wing. At helicopter mode, the rotor/scissors wing rotates to make the air vehicle fly...
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6634861 |
Power plant for propeller aircraft
A power plant for propeller aircraft has two propulsion devices, each having a propeller, an engine for powering the propeller, and a gear transmission interposed between the engine and the...
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6622962 |
Fixed wing aircraft having powered rotor VTOL capability with rotor blades stowable during horizontal flight
An apparatus that includes a rotor blade assembly capable of generating vertical lift, one or more propulsion units capable of engaging and disengaging from the rotor blade assembly, an...
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6592071 |
Flight control system for a hybrid aircraft in the lift axis
A flight control system includes a lift control algorithm which selectively communicates with the pitch command of the flight system control algorithm. The lift control algorithm selects the proper...
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6561455 |
Vertical take-off and landing, aerodynamically self-sustained horizontal flight hybrid aircraft
An vertical take-off and landing (VTOL) and horizontal flight (HF) aircraft has a fuselage with wings providing lift during horizontal flight, a rotor on the nose of the fuselage that is stowable...
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6497385 |
Rotor blade with optimized twist distribution
A rotor blade has a local geometric twist angle θ=ƒ(r/R), with R being the blade span and r being the distance along the blade span from the axis of rotation. The blade has an inner region b...
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6457672 |
Propulsion nacelle alignment system for tilt-rotor aircraft
The propulsion nacelles of a tilt-rotor type aircraft are adjustably positioned on the aircraft wings under control of a programmed actuator in response to error signals produced by change in angle...
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6367736 |
Convertiplane
A convertiplane having a wing in turn having two halfwings, each defined by a fixed portion adjacent to the fuselage, and by a movable portion rotating, with respect to the fixed portion, about a...
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6343768 |
Vertical/short take-off and landing aircraft
A tilt-rotor aircraft capable of vertical/short take-off and landing. The aircraft utilizes a co-axial counter rotating rotor system to provide vertical and horizontal thrust. The fuselage is...
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6328256 |
Low-height tunable tilt rotor downstop
A improved tilt rotor aircraft comprising an airframe, at least one wing member coupled to the airframe, and at least one tilt rotor assembly carried by the at least one wing member. The improved...
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6290171 |
Device for controlling a helicopter hybrid countertorque system
The present invention relates to a device (1A) for controlling a hybrid countertorque system of a helicopter (He), which comprises a countertorque rotor (R2), and at least one aerodynamic steering...
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6247667 |
Tiltrotor aircraft pylon conversion system
A pylon conversion system (100) for operating a pylon (12) on a tiltrotor aircraft (10) between an aircraft mode and a helicopter mode is disclosed. The system (100) comprises first and second...
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6234422 |
Uniblade air rotor and flight and covercraft vehicles with its
The invention is related to air flight vehicles, such as vertical take-off and landing (VTOL) airplanes, helicopters and covercraft.The goal of this invention is to create an air rotor designed so...
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6227481 |
Method and apparatus for controlling force fights in a rotating shaft
An improved tilting rotor aircraft, a control system for an elongated shaft, and a method of controlling an elongated shaft are provided. Sensors are utilized to detect an amount of twist on a...
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6220545 |
Method and apparatus for sensing preload in a tilt rotor downstop
A improved tilt rotor aircraft comprising an airframe, at least one wing member coupled to the airframe, and at least one tilt rotor assembly carried by the at least one wing member. The tilt rotor...
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6161800 |
Pivoting spanwise-flow redirector for tiltrotor aircraft
A tiltrotor aircraft includes a spanwise-flow redirector having a pair of flow-redirection panels respectively mounted on the aircraft's mid-fuselage area for rotation about a panel pivot axis...
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6082968 |
Centrifugally activated variable damper assembly
A centrifugally activated variable damper assembly for a stopped-rotor aircraft is disclosed for adjusting dampening level of teetering motions produced by the rotors during the in-flight...
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