Match Document Document Title
5035577 Blade for an aircraft rotor and rotor comprising such a blade  
A blade is overtwisted in the extremity zone from at least 0.85R so that the resulting twist is at least equal to a limiting twist θlimC according to the plane form Co/C(r) of the blade in this...
5035377 Free standing or aircraft lift generator  
In order to increase the lift supporting underpressure force on top of the inlet fairing of a shrouded fan of a lifting engine and in order to reduce the negative lift generating force of the...
5017090 Variable pitch propeller blades and drive and adjusting mechanism therefor  
A propeller blade having (i) a planar configuration (ii) an inner end portion, (iii) an outer end portion, (iv) a relatively sharp, outwardly swept back leading edge portion, and (v) a cylindrical...
RE33589 Helicopter blade airfoil  
A family of airfoil cross sections, termed SC21xx, for use in a helicopter blade is disclosed. The airfoil (36) achieves maximum lift performance equivalent to prior art airfoil configurations...
5007801 Impeller made from a sheet-metal disk and method of manufacturing same  
An impeller formed from sheet-metal by stamping and bending, at a low production cost, capable of delivering an increased quantity of air at a reduced noise level and with reduced power...
4941803 Airfoiled blade  
A family of airfoils for use in a high solidity factor blade having a leading edge portion and a trailing edge portion, a tip portion, and a root portion, has a plurality of airfoil sections. Each...
4930990 Quiet clutch fan blade  
A clutch fan has a new and unique blade design that results in quieter and more efficient operation. The blade design involves the leading edge having inner, intermediate, and outer regions such...
4928663 Enhanced air-flow convection oven  
An enhanced, air-flow convection oven is disclosed, comprising an oven chamber liner circumscribed by a thermally insulated outer oven shell with a heat source in a combustion chamber between the...
4927330 Air propeller  
A propeller is used to displace a vehicle at a reduced speed but with a high slip of approximately at least 60% and has a quality coefficient of at least 70% for 100% slip. The ratio of the...
4921404 Propellors for watercraft  
A propellor (10) for watercraft has a hub (11) with a pair of blades (12) with a leading portion (13) central portion (14) and trailing portion (15). The leading portion (13) of the blades are...
4911612 Sections for shrouded propeller blade  
This invention relates to a section for shrouded propeller blade, of which the relative thickness is included between 9% and 15%, wherein, the curvature of said section having a maximum value at...
4896971 Mixing apparatus  
A mixer which provides axial flow in a non-uniform flow field, such as may be established by gas which is sparged into a medium being mixed in a tank, and provides large axial flow volume without...
4893990 Mixed flow impeller  
The disclosure is directed to a mixed flow impeller with a low noise, to be used for a blower of an air conditioner or the like. The mixed flow impeller of the present invention is characterized...
4869644 Blades for propeller fan  
Each blade (2) of a propeller fan projecting radially outwardly from the outer peripheral surface of an annular boss (1) has on at least part of its suction side (3), a coarsened surface (4).
4859150 Blades for low speed propeller fan  
Each blade of a low speed propeller fan extended radially outwardly from a member connected a rotating body has a coarsened surface at least part of its suction side. The coarsened surface has a...
4846629 Blades for high speed propeller fan  
Each blade of a high speed propeller fan extended radially outwardly from a member connected to a rotating body has a coarsened surface at least part of its suction side. The coarsened surface has...
4840541 Fan apparatus  
A fan apparatus for preventing the occurrence of a burble on a surface of a blade while the resistance to air flow into the fan is increased and the generated noise is kept small. Each fan of the...
4826405 Fan blade fabrication system  
A system for fabricating fan blades wherein the assembly includes a flat hub plate having generally radially oriented notches defined therein intersecting the plate periphery. Individual blades...
4817858 Method of manufacturing a workpiece of any given cross-sectional dimensions from an oxide-dispersion-hardened nickel-based superalloy with directional coarse columnar crystals  
Method of manufacturing a workpiece of any given cross-sectional dimensions from an oxide-dispersion-hardened nickel-based superalloy available in the form of coarse-grained longitudinally...
4796836 Lifting engine for VTOL aircrafts  
A hovering or VTOL aircraft with a propulsion unit using a fan in a shroud whose upper end is toroidally shaped and rotationally symmetrical with a convex curvature with a radius of curvature...
4795312 Turbo-machine blade  
Turbo-machine blade, including: a continuously curved profile contour having convex curved leading edge, suction side and trailing edge regions, and a concave curved pressure side region; the...
4790724 Aerial propellors more especially for aircraft propulsive units  
The mean line (F) of each blade (1) is formed by a flat continuous curve contained in a plane OZ-OYo forming with the plane of rotation of the propeller an angle φo between 35° and 55° and...
4789306 Marine propeller  
A multi-bladed marine propeller designed for efficient operation in intermediate, partially cavitating flow regions between fully cavitating flow and noncavitating flow. Each of the blades has a...
4780058 Stable fluid foil section  
A fluid foil for use in a marine propeller having an upper surface with a uniform, continuous convex shape commencing at the leading edge and terminating at the trailing edge of the foil section...
4776531 High lift, low pitching moment airfoils  
This invention relates to airfoils which have particular application to rotors of helicopters and rotorcraft and to aircraft propellers. Two airfoil profiles, the RC(4)XX and RC(5)XX are shaped to...
4775297 Non-clogging impeller for use in axial and mixed-flow centrifugal pumps  
The vane of the impeller in a high-speed or mixed-flow centrifugal pump for the conveying of liquids which contain high or low concentrations of strands or strips of vegetable, plastic or other...
4773825 Air propellers in so far as the profile of their blades is concerned  
The invention relates to improvements to air propellers in so far as the profile of their blades is concerned. The law of evolution of the curvatures of the extrados 2 is the following: the...
4774031 Aerator  
An aerator (10) is disclosed which includes a hollow outer tube (12) and a hollow inner tube (14) rotatably supported therein. The inner tube is drivingly connected to a drive shaft (28) of the...
4746271 Synthetic fan blade  
The invention pertains to a fan blade and a method for making a fan blade wherein the stresses within the blade material are substantially constant throughout the length of the blade and the...
4732532 Arrangement for minimizing buzz saw noise in bladed rotors  
The invention minimizes selected tones present in buzz-saw noise, otherwise known as multiple pure tone noise. This noise arises from the production of unequal shockwaves during the rotation at...
4730985 Prop-fan with improved stability  
Improved prop-fan stability is achieved by providing each blade of the prop-fan with a leading edge which, outwardly, from a location thereon at the mid-span of the blade, occupy generally a...
4692098 Airfoil for high efficiency/high lift fan  
Airfoil for vehicle fan which operates in low Reynolds number and varying turbulent conditions having a discontinuity formed on the suction surface thereof adjacent to its leading edge to trigger...
4671738 Rotor or stator blades for an axial flow compressor  
A rotor or stator blade for an axial flow compressor has one or both of its end portions designed to minimize the interference between the annulus boundary layer and the blade. The basis of the...
4669164 Method and apparatus for the manufacture of variable dimension fans  
Construction of impellers of various dimensions are manufactured from tubular hub stock and sheet-like blade stock by cutting a hub of particular length from said hub stock and blades of...
4668169 Helicopter rotor blade  
An outboard region of a helicopter rotor blade of aerofoil cross section has a thickness to chord ratio not greater than twelve percent and an inboard region has a thickness to chord ratio greater...
4664593 Blade configuration for shrouded motor-driven fan  
A motor-driven fan including a hub adapted to be driven by a motor, a plurality of fan blades provided on the hub to extend in radial directions, a shroud including a ring-shaped portion...
4652213 Propeller blade for aircraft propulsion  
The external part at least of a propeller blade, having a maximum relative thickness between about 2 and 6%, has a profile whose thickness variation law along the chord comprises a first zone (I)...
4632636 Propeller with blades having regressive pitch  
A propeller (10) including a hub (12) and a plurality of blades (16) having a leading edge (22), outside edge (24), tail edge (26) and inside edge (28). Each of the blades (16) extend...
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...
4602410 Guide vane ring for a return flow passage in axial fans and a method of producing it  
A guide vane ring for a return flow passage in axial fans comprises a ring (3) intended for placing in the return flow passage (4) coaxial with the impeller (6). A plurality of guide vanes (7) are...
4564337 Aircraft propeller  
An aircraft propeller blade comprising an inner section which extends from the propeller hub toward the blade tip, a middle section adjacent to said inner section, and an outer section which...
4555835 Process for producing propellers  
A method is provided for the fabrication of a steel propeller which is designed to have a final shape and size consistent with a conventional propeller design. The resultant formed propeller...
4550497 Tool to produce a new angle on a fan blade  
Cutting tools for shaping or reshaping the airfoil edge of a blade of a gas turbine engine to produce a uniform blade leading edge shape on the operative portion of the blade.
4531270 Method for the manufacture of metal vanes for turbomachinery  
To make vane airfoils for an axial flow compressor metal strip is first contour rolled to a cross section comprised of two opposing airfoils separated by a center rib, where one of the faces of...
4519746 Airfoil blade  
An improved airfoil blade for aircraft propellers and the like which exhibits high aerodynamic performance and low far and near field noise levels at a minimum weight is provided with a novel high...
4507960 Speed indicator  
A speed indicator for water vehicles which has a vane wheel transmitter mounted for rotation about an axis is exposed to the extent of one half thereof to the flow of water. In order to obtain a...
4498646 Wing for short take-off and landing aircraft  
Profile design for aircraft lift-wings in general aviation up to flight speeds of about 700 km/h, the profile design being determined by the path of the center line with a forward (first) and rear...
4477228 Injection molded propeller  
An inexpensive injection molded propeller for mounting on a drive shaft. The drive shaft is attached to the hub of the propeller by a chemical and thermal shrink fit and by deformation due to the...
4473336 Turbine blades  
The present invention relates to turbine blades and in particular to turbine blades for use in gas turbine engines. Tensile stresses are introduced into turbine blades when they rotate at high...
4467217 Hydro-turbine  
An improved hydro-turbine having a casing with an inlet port and an outlet port. A driveshaft is journaled in the casing and a rotor is secured to the driveshaft. The rotor has a cylindrical...