Abstract: A hybrid propulsion system for an aircraft, the aircraft having a propulsor, such as a propeller or ducted fan. A motor/generator drives the propulsor and/or generates electrical energy to be stored in an on-board battery pack. A power turbine is directly connected to the motor/generator via a power shaft, and is driven by exhaust from a gas generator system. The gas generator system has a compressor, a combustor, and a gas generator turbine that drives the compressor via a compressor shaft as well as produces exhaust gas output for the power turbine.

Abstract: A method of filtering air entering the intake opening of a gas turbine engine. A straightening tube provides a straight channel for incoming air flow. A flow redirector provides a path for air flow that is at right angles to the channel provided by the straightening tube and that leads to the intake opening of the engine. A filter at the downstream end of the flow redirector has a pair of rollers for unrolling and re-rolling a roll of adhesive tape, with an exposed section of the adhesive tape blocking the downstream end of the flow redirector and capturing particles in the air flow. The rollers are activated as needed to expose fresh sections of tape.

Abstract: A method of filtering air entering the intake opening of a gas turbine engine. A straightening tube provides a straight channel for incoming air flow. A flow redirector provides a path for air flow that is at right angles to the channel provided by the straightening tube and that leads to the intake opening of the engine. A filter at the downstream end of the flow redirector has a pair of rollers for unrolling and re-rolling a roll of adhesive tape, with an exposed section of the adhesive tape blocking the downstream end of the flow redirector and capturing particles in the air flow. The rollers are activated as needed to expose fresh sections of tape.