Abstract: A low cost, high power density, low emissions general aviation turbine engine (GATE) with improved fuel economy over current engines. Ideally suited for 50 to 500 shaft horsepower (SHP) range aircraft applications such as GA, UAS, UAS, air taxi, helicopters and commercial markets. The engine design features with centrifugal compressor and radial turbine rotors has a high-end practical limit of ˜800 (SHP). The new turboprop incorporates 2 non-concentric spools aero-thermal—pressure coupled wherein staged compressor rotors lend to a simple engine design, optimized high overall engine pressure ratio (OPR) and low specific fuel consumption (SFC). An integral starter-generator system further simplifies the engine design and offers high electrical output power capability for auxiliary power requirements.

Abstract: An axial fan with reversible flow direction comprises a rotor (11), which is driven by a variable speed-controlled driving motor (14) and is provided with adjustable rotor blades (13) fitted around a rotational axis. The rotor (11) is preceded by an inlet stator (15) and followed by a downstream stator (16), which are each provided with guide vanes (17, 18). The guide vanes (17, 18) of the inlet stator (15) and the downstream stator (16) are designed so as to be mirror-symmetrical to the radial center plane of the rotor (11) and may be adjusted at an angle to the direction of flow in such a way that—when the flow direction is reversed—the inlet stator (15) takes on the function of a downstream stator and the downstream stator (16) takes on the function of an inlet stator.