Dual-channel deicing system for a rotary wing aircraft
First Claim
1. A main rotor blade assembly for a rotary-wing aircraft comprising:
- a main rotor blade;
a first electrothermal heating element located along a leading edge of said main rotor blade over a stagnation line;
a second electrothermal heating element located aft of said first electrothermal heating element along an upper surface of said main rotor blade; and
a third electrothermal heating element located aft of said first electrothermal heating element along a lower surface of said main rotor blade;
a controller in communication with said first electrothermal heating element, said second electrothermal heating element and said third electrothermal heating element, said third electrothermal heating element operated prior to said first electrothermal heating element and said first electrothermal heating element operated prior to said second electrothermal heating element in response to a heating cycle defined by said controller, said heating cycle includes an on-time and an off-time.
1 Assignment
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Accused Products
Abstract
A deicing system includes dual deice system components to provide a redundant deice system. Each redundant portion of the system generally includes a controller, an air data computer, an ice rate controller, and an ice rate probe. The controller communicating a heating cycle which defines a multiple of electric pulse trains to sequentially provides power to a multiple of heating elements in a designated blade set. Each electric pulse train is defined by an element on-time, a null time between the element on-time for this element and the next element, and an off-time between repetition of the heating cycle for the first heater element. The element on-time is a function of outside air temperature (OAT). The off-time is a function of liquid water content. The tail rotor heating cycle is a more straightforward version of the main rotor heating cycle as each of the tail rotor blade are activated simultaneously and there is only a single heating element on each tail rotor blade.
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Citations
17 Claims
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1. A main rotor blade assembly for a rotary-wing aircraft comprising:
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a main rotor blade; a first electrothermal heating element located along a leading edge of said main rotor blade over a stagnation line; a second electrothermal heating element located aft of said first electrothermal heating element along an upper surface of said main rotor blade; and a third electrothermal heating element located aft of said first electrothermal heating element along a lower surface of said main rotor blade; a controller in communication with said first electrothermal heating element, said second electrothermal heating element and said third electrothermal heating element, said third electrothermal heating element operated prior to said first electrothermal heating element and said first electrothermal heating element operated prior to said second electrothermal heating element in response to a heating cycle defined by said controller, said heating cycle includes an on-time and an off-time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A main rotor blade assembly for a rotary-wing aircraft comprising:
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a main rotor blade; a multiple of electrothermal heating elements located adjacent a leading edge of said main rotor blade; a controller in communication with said multiple of electrothermal heating elements, said multiple of electrothermal heating elements operated in response to a heating cycle defined by said controller, said heating cycle includes an on-time and an off-time for each of said multiple of electrothermal heating elements, said off-time a function of liquid water content (LWC). - View Dependent Claims (12, 13, 14, 15)
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16. A rotary-wing aircraft comprising:
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a multiple of main rotor blades; a controller in communication with at least one electrothermal heating element on each of said multiple of main rotor blades, said at least one electrothermal heating element operated in response to a heating cycle defined by said controller, said controller operable to initiate said heating cycle simultaneously on a first main rotor blade of said multiple of main rotor blades and a second main rotor blade of said multiple of main rotor blades, said first main rotor blade opposite said second main rotor blade; a first electrothermal heating element located along a leading edge of each of said multiple of main rotor blades over a stagnation line; a second electrothermal heating element located aft of said first electrothermal heating element along an upper surface of each of said multiple of main rotor blades; and a third electrothermal heating element located aft of said first electrothermal heating element along a lower surface of each of said multiple of main rotor blade; said controller in communication with said first electrothermal heating element, said second electrothermal heating element and said third electrothermal heating element on each of said multiple of main rotor blades, said third electrothermal heating element operated prior to said first electrothermal heating element and said first electrothermal heating element operated prior to said second electrothermal heating element in response to said heating cycle defined by said controller. - View Dependent Claims (17)
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Specification