Abstract:
A system for cooling a ducted fan aircraft engine includes a first nacelle surrounding the engine and a second nacelle substantially concentrically surrounding the first nacelle. The system includes a first spinner coupled around a base of a rotor of the ducted fan and a second spinner substantially concentrically surrounding the first spinner and forming a duct between first and second spinners. The second spinner includes an opening to allow air to flow into the duct. The rotor includes a plurality of airfoils penetrating through the first and second spinners. Each of the airfoils includes a first portion located in the duct, and a second portion located between the second spinner and a fuselage of the ducted fan. The first portions of the airfoils provide cooling airflow over the engine and structural support for the second portions. The second portions of the airfoils provide thrust for the aircraft.
Abstract:
A VTOL vehicle including a fuselage with two foldable wings, two tiltable nacelles attached to the wings, a vertical stabilizer, a horizontal stabilizer, and two auxiliary thrusters. Each nacelle contains a system of vanes located at the rear opening thereof, and actuators are provided for extending and retracting the vanes in conjunction with nacelle tilting mechanisms to deflect the airflow over a predetermined range of angles from the horizontal. Each nacelle also contains two rotary engines, each of which directly drives a fan. The fans face each other and operate in counter-rotating directions at the same rotational speed. An alternative embodiment includes two additional nacelles attached to the fuselage instead of having the auxiliary thrusters. A redundant computerized flight control system maintains stability of the vehicle as it transitions from one flight mode to another.
Abstract:
A hollow type impeller for a water surface shifter is disclosed. The hollow type impeller includes a hollow tube-impeller assembly having a hollow tube and an impeller formed on the inner peripheral surface of the hollow tube. The impeller is capable of discharge air or water at a high speed when rotated. A roller-tooth wheel transfers a driving power of an engine of the water surface shifter via a power transmission shaft to the tube-impeller assembly. A crown sprocket gear is integrally formed with the outer peripheral surface of the hollow tube and engaged with the roller-tooth wheel. A hollow tube-type impeller housing is formed at the outside of the hollow tube-impeller assembly. The impeller can carry out suction and discharge of water and air while rotating at a high speed by means of the driving power transferred by the roller-tooth wheel, so that a propulsive force is generated to move the water surface shifter in a state floated above the water surface.
Abstract:
La invención se refiere a una hélice que comprende una base (2, 15) y una pluralidad de palas (1, 14) que se extienden de dicha base de forma inclinada aguas arriba, es decir, en la dirección correspondiente a la dirección de marcha (D1) hacia delante de la nave. Las palas se extienden en una dirección que forma un ángulo agudo α con la dirección de marcha hacia delante, 10°≤α≤ 80°. La invención también se refiere a un sistema de propulsión que incluye la hélice así como a una nave que incluye el sistema de propulsión.
Abstract:
La invención se refiere a una hélice que comprende una base (2, 15) y una pluralidad de palas (1, 14) que se extienden de dicha base de forma inclinada aguas arriba, es decir, en la dirección correspondiente a la dirección de marcha (D1) hacia delante de la nave. Las palas se extienden en una dirección que forma un ángulo agudo α con la dirección de marcha hacia delante, 10°≤α≤ 80°. La invención también se refiere a un sistema de propulsión que incluye la hélice así como a una nave que incluye el sistema de propulsión.
Abstract:
A VTOL vehicle with tiltable nacelles (14 and 16), with counter rotating fans which are directly driven by two included rotary engines. In an alternate embodiment there are two additional nacelles with additional thrusters. A redundant computer flight control system maintains stability while the vehicle transitions from one flight mode to another.
Abstract:
A disclosed vertical lift flying craft includes a lift unit that, during operation, develops a force including an upward component. A payload unit suspends from the lift unit. The payload unit suspends from the lift unit in such a way as to impart lateral stability while remaining capable of horizontal flight, without incurring the adverse effects of a downward pitching moment. In addition to a lift unit and a payload unit, the vertical lift flying craft includes a pair of bearings and a suspension structure, which cooperate to suspend the payload unit from the lift unit. Other systems and methods are also disclosed.
Abstract:
A high performance propeller comprises a hub and a plurality of blades, characterized in that on the tip of each blade is formed an extension that is substantially perpendicular to the blade and extends from the tip either to one side of the blade or to both sides. With the propeller according to the present invention the induced resistance is reduced, the centrifugal force can be transferred into effective force, the difference of pressure near the tip is increased and whereby the effective force of the blades are increased. It is proved that in case of large tilting propeller the flow rate is increased up to 12-17%, or 40%-70% of energy is saved.
Abstract:
a low-aspect ratio propeller system is provided with a multiple ring structure (42) formed with a plurality of circular or non-circular, annular, narrow equivalent air foil rings (56.1, 56.2, 56.3, 56.4) which are held by rails (40) in a predetermined relationship with the propeller blades (44). The upstream ring (56.1) is located downstream from the tip vortex of the propeller (44) within the axial span of the propeller. One or more additional downstream-located rings (56.2, 56.3, 56.4) are used so as to provide at least one annular multiple ring-defined pump aperture (60, 62, 64) through which peripheral vortices generated by the propeller blades (44) or fan blades may enhance the mass flow. These vortices increase thrust because their induction action on the rings (56.1, 56.2, 56.3, 56.4) increase beneficial ring flow circulation. Augmented ring flow reduces the velocities in the expanding wake by increasing the mass flow. The destruction of tip and root vortices reduces noise. The multiple ring structure (42) also serves as a guard.