Abstract: A piece of rotary equipment for a drone, the rotary equipment having a rotary assembly including at least one blade. The rotary assembly includes at least one furrow that extends in a skin from a first end to a second end, the at least one furrow being at least arranged over the blade, the at least one furrow presenting at least one change of direction on the blade, the rotary assembly including at least one deicer having an electrically conductive track that extends in the at least one furrow, the electrically conductive track extending from a first terminal to a second terminal, the first terminal being present at the first end and the second terminal being present at the second end, the deicer including a protective layer covering the electrically conductive track.

Abstract: Systems and methods of deicing aircraft propellers include a deicing heater timing cycle, i.e. heater on/heater off schedule that is calculated as a function of ambient temperature and the airspeed of the aircraft.

Abstract: A heating fan has a fastening means for fastening of said fan to a first surface. A stem connects the fastening means to a hub. The hub has a motor unit. The motor unit rotates a plurality of wings extending radially from said hub. The wings have upper and lower surfaces. Each wing has a leading edge and a trailing edge, defining upper and lower surfaces therebetween. At least one wing has electrical heating means integrated or connected to the upper surface. At least more than half the length of the leading and/or trailing edge is bent downwards relative to the surface of the wing.

Abstract: An electrical heating device includes at least one heat generating element and at least one heat emitting element having opposed surfaces that abut the heat generating element. The heat generating element includes at least one PTC heating element having strip conductors on both sides of it for the electrical supply of the PTC heating element At least one of the strip conductor is provided with at least one contact projection which protrudes beyond a PTC heating element locating face formed on the strip conductor. Also disclosed is a heat generating element having at least one strip conductor provided with at least one contact projection.

Abstract: The inventive power system preferably comprises an air-duct provided with a vane-type rotor, which is arranged therein and mechanically connected to a shaft of a generator, and a heater electrically connected to the generator's outlet. The air-duct is incorporated into a building or arranged outside thereof. It can be located between the outer and inner walls of thereof and in its premises. The heater is mounted directly on the vanes of the rotor or they can be embodied in the form of electric heater. The electric heater located outside of the air-duct warms up the building independently of the temperature of air in the air-duct. An elastic sleeve can be installed between the air-duct and an air-balloon and is embodied in the form of a portion of the air-duct. The system can comprise a number of air-ducts of different configurations, a number of heat exchangers (heaters and/or coolers).

Abstract: An all season fan with heated circulating blades includes heating elements mounted in slots defined in the rear surface of the fan blades for heating of air blown outwardly therefrom. Resilient biasing devices such as a bow springs are mounted in the fan blades extending over the slots to retain the heating elements in the slots. Electrically conductive ball bearings are included to facilitate rotation of the fan blade and hub while simultaneously providing electrical power to the heating elements during fan rotation. At least two bearings each individually maintain separate electrically conductive abutment respect to two separate conductive rings mounted in an insulating insert within the fan hub. Each ring is electrically conductive with respect to one end of each heating element for heating thereof during fan rotation.

Abstract: The present invention involves coatings deposited on a substrate including a layer having a selected resistivity. The resistive layer can serve as a heat source in a variety of applications and can be fabricated using an arc plasma spraying procedure.

Abstract: An electrical appliance has a plug receptor to receive the plug of another appliance such that both appliances can draw power from a single electrical outlet. The appliance of the present invention is operable at different wattages and has a switch which is movable to different switch settings to determine the wattage at which the appliance is operating. When the switch is set such that the appliance operates at a high wattage, the plug receptor is blocked from access to the plug of the other appliance to prevent over loading of the electrical outlet.

Abstract: The present invention involves coatings deposited on a substrate including a layer having a selected resistivity. The resistive layer can serve as a heat source in a variety of applications and can be fabricated using an arc plasma spraying procedure.

Abstract: A hot air/cold air dual-mode electric fan including a vane assembly having an electric heating coil in the mica sheets of each vane, a bakelite mount fixedly secured to the vane assembly and having a circuit board with backward female contacts, a barrel mounted inside a holder in front of a motor and having separated carbon brushes, a shaft mounted within the barrel and coupled to the motor and having male contacts respectively connected to the female contacts and separated copper rings respectively disposed in contact with each carbon brush, and a control circuit for controlling power supply to the electric heating coils and regulating its heating temperature, so that the vane assembly produces currents of cold air when the motor is started and power supply is cut from the electric heating coils by the control circuit, or currents of hot air when the motor is started and power supply is connected to the electric heating coil by the control circuit.

Abstract: A nozzle attachment for a hair dryer has a cylindrical element for connecting a flow-directing member to the nozzle of a hair dryer. The flow-directing member deflects the air coming from the hair dryer by a certain acute angle. The flow-directing member is rotatable relative to the cylindrical element. Vanes are provided within the flow-directing member. They are slanted to the direction of air flow from the hair dryer, so that impingement of air on the vanes causes the flow-directing member to rotate thus providing air flow having a continually varying flow direction.

Abstract: An electric fan includes a vane assembly fastened to a hub connected to a base plate in front of a motor output shaft of the motor by a connector and two bearings, which vane assembly is consisted of a plurality of vanes, of which each is comprised of an electric heating element covered by two aluminum alloy blades with radiating fins thereon and electrically connected to the two opposite ends of an external power supply through a switch with an adjustable thermostat in series to control the "on" or "off" and the temperature of the heating elements.

Abstract: A bubbling air mat has an air hose leading to a control unit having a motor therein. A number of saftey devices are provided to prevent a user from being electrocuted if water reaches the control unit. In the most protected area within the control unit, a rope heater is provided to warm an air stream being driven by said motor and through said air hose to bubble from the air mat.