Class 244/65 - Screw

Subclass of Class 244 - Aeronautics and astronautics
Definition: The arrangement relative to aircraft and the combination
No. of patents: 30
Last issue date: 10/02/2007

Number	Title	Issue Date
7275973	Toy aircraft A toy aircraft may include an airframe, which may include a fuselage and a wing assembly. The toy aircraft may include at least one propulsion unit mounted to the airframe. The at least one propulsion unit may be operable to propel the toy aircraft. The toy aircraft...	10/02/2007
7267589	System and apparatus for improving safety and thrust from a hydro-drive device A system and apparatus are disclosed for improving safety and hydro-flow thrust from a hydro-drive device. The apparatus may include a shroud having a first opening for the ingress of water, and a second opening for the egress of water, and a vane extending inward f...	09/11/2007
7229331	Shroud for a hydro thrust device An apparatus is disclosed for improving safety and hydro-flow thrust from a trolling motor. The apparatus may include a first and second semi-circular portions configured to connect together to substantially enclose a hydro-drive device, and a semi-circular bracket ...	06/12/2007
7121505	Method of control for toy aircraft The invention described here offers a low-cost method of remote flight control suitable for use in toy airplanes and ornithopters (flapping-wing aircraft). To accomplish this, the aircraft is powered by a reversible electric motor. The propeller or flapping wing pro...	10/17/2006
7007889	Flexible airfoils and method An airfoil for use in kites, movable wing aircraft and fixed wing aircraft has a straight spar inserted into a sleeve in the arcuate leading edge of a flexible wing panel. The resultant forces on the spar dynamically shape the airfoil. The airfoil is reinforced by b...	03/07/2006
6457671	Funneled rotary foil A funnel strip is added to a rotary airfoil, which utilizes the Bernoulli principle to increase the velocity of air over the suction side of the rotating airfoil to increase the lift. The device is applicable to thrust-producing devices, such as propeller...	10/01/2002
6264138	Propeller gearbox An aircraft (10) having turboprop propulsion has a plurality of gas turbine engines (11), each with a two stage reduction gearbox (30,41) with the engine output shaft (17,17A) inline with the propeller drive output shaft (19,51) to drive a propeller (12) ...	07/24/2001
6138946	Device for lift and to reduce resistance to aircraft advance The device for lift and to reduce forward resistance of aircraft consists of a converging input duct of truncated-cone-shaped or truncated-pyramid-shaped, arranged lengthwise inside the fuselage and inclined to the longitudinal axis, with the larger openi...	10/31/2000
5971322	Propeller propulsion unit for aircrafts in general A propeller propulsion unit for aircrafts in general including a rotation shaft driven by a motor, the unit including a single-blade propeller and a counterweight that are connected to the shaft, the counterweight being arranged in a substantially diametr...	10/26/1999
5961067	Method for reducing turboprop noise An apparatus and method for reducing noise within the fuselage of a propeller driven aircraft. In one embodiment the propeller blades are spaced apart and in front of an offset inlet. The inlet provides air to a gas turbine engine powering the propeller, ...	10/05/1999
5839926	Airboat systems and methods for increasing engine efficiency while reducing torque and noise An airboat propelling system is provided wherein a propeller is rotated by a hollow driven shaft. A further embodiment is provided wherein two propellers are rotated in opposite directions by counter-rotating coaxial hollow driven shafts. Floating stiffen...	11/24/1998
5823466	Propeller balancing method and apparatus A method and apparatus to balance propeller blades including, but not limited to, those used on model aircraft provides relocation of the propeller's center mounting hole to the propeller's center of mass by installation of appropriate eccentric bushings ...	10/20/1998
5810289	High velocity propeller A propeller for fluid propulsion comprises a pair of substantially rigid blades which rotate about their longest dimension in opposite directions, the blades each being oppositely helically twisted along the longest blade dimension and positioned together...	09/22/1998
5810288	High velocity propeller A propeller for fluid propulsion (such as air or water) comprises a pair of substantially rigid blades. The blades are mounted for rotation about respective, separate, parallel rotation axes, with the axes being also substantially parallel to the longest ...	09/22/1998
5791595	Propeller balancing method and apparatus A propeller balancing method and apparatus provides relocation of the propeller's center mounting hole to the propeller's center of mass. The method uses a conventional balance stand, by first attaching a balanced drill guide fixture to the hub of the pro...	08/11/1998
5743489	Aircraft with two alternatingly operated propellers of different radius An aircraft has at least one drive motor coupled to first and second propellers for forward thrust of the aircraft. The first propeller is dimensioned for takeoff and landing conditions and for flight conditions below a predetermined first flight altitude...	04/28/1998
5588619	Propeller syncro-pulsing Indexing a propeller blade so it leads intake valve timing by a specific amount causes an increase in engine power. The proper indexing allows the high energy propeller wake in the form of an acoustic wave to be ingested by the induction system and arrive...	12/31/1996
5516061	Shroud for a reversible thrust fan The invention is a shroud for a reversible thrust fan, the shroud having a inlet duct and an exhaust nozzle with the fan located there between. In general terms, the shroud includes a system for increasing the efficiency of the exhaust nozzle when acting ...	05/14/1996
5292088	Propulsive thrust ring system A low-aspect ratio propeller system is provided with a multiple ring structure formed with a plurality of circular or non-circular, annular, narrow equivalent air foil rings which are held by rails in a predetermined relationship with the propeller blades...	03/08/1994
5135185	Wing mounted unducted fan engine An aircraft engine is mounted on an aircraft wing such that the wing wake sheds along a zone at a predetermined position on the engine disk thereby minimizing dynamic loads or resonance. For a prechosen or design set of engine conditions the strength of t...	08/04/1992
4930725	Pusher propeller installation for turboprop engines A pusher turboprop engine is provided with an interior exhaust duct structure which directs the hot turbine gases through and out of the engine nacelle and around the rear spinner which surrounds the propeller hub. The spinner supports blade-shaped shield...	06/05/1990
4892269	Spinner ducted exhaust for pusher turboprop engines A pusher turboprop engine is provided with an interior exhaust duct structure which directs the hot turbine gasses through and out of the engine nacelle to an annular duct mounted on the rear spinner which surrounds the propeller hub. The rotating annular...	01/09/1990
4871130	Propulsion apparatus for an aircraft An internal combustion engine is installed near to the center of gravity of an aircraft and has a power output shaft which is arranged to be inclined with respect to the aircraft longitudinal axis, in the direction of a high empennage of the aircraft. An ...	10/03/1989
4795308	Obstacle in front of a propeller In combination with a propeller disposed in an aircraft, aft from the nose portion of the craft, an improvement is provided for reducing noise, as well as mechanical load on the propeller blade, and includes a construction part situated upstream from the ...	01/03/1989
4676459	Double propeller for propelling aircraft Double propeller for propelling aircraft, with two coaxially and axially offset propellers that can be driven separately by associated drive mechanisms through a central shaft and a hollow shaft. To reduce noise and maintain safe operation even when one p...	06/30/1987
4630787	Airframe and propulsion system An aircraft is disclosed as having the components of a high wing airframe, a single engine of the 360 type, and a propeller formed with airfoil cross sections along the blades thereof having profiles which, when particularly matched with the designated en...	12/23/1986
4611774	Propeller drive assembly An assembly for mounting a propeller, which is driven by an aircraft engine, on a longitudinal member of a lightweight aircraft. The assembly includes a sleeve positioned about the longitudinal member, and a pair of opposed adjustable cups securing the sl...	09/16/1986
4504029	Fluid motor driven multi propeller aircraft An aircraft has a pair of wing portions with propellers of a propeller pair which are driven and synchronized by a fluid transmission between the power plant and the propellers. A fluid line structure keeps most components of the craft together and consis...	03/12/1985
4500055	Aircraft propulsion system arrangement In an aircraft arrangement comprising an aircraft fuselage provided with a wing on either side thereof and provided with a propeller propulsion system at the rear of the fuselage, the improvement comprising a propulsion system comprised of at least two in...	02/19/1985
3968944	Aircraft with shrouded propeller drive This invention relates to an improvement in an aircraft having a tail-mounted, shrouded pusher-type propeller and an engine mounted in front of the shroud, the improvement comprising exhaust pipe running from the engine to the shroud....	07/13/1976

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Class 244/65 - Screw