Abstract: A propulsion device for exerting thrust to a fluid comprises a central hub and at least two propulsive arrangements which protrude radially from the hub. Each propulsive arrangement comprises front and rear propulsive elements extending from a front inner end to a front outer end and from a rear inner end to a rear outer end, respectively. Inner and outer guide elements extend from the front end to the rear end. An elongate front distance member and an elongate rear distance member extend radially from the hub to the inner guide element. At least one intermediate propulsive element is arranged between the front and rear propulsive elements and extends radially from the inner guide element to the outer guide element. The inner guide element, the front distance member, the rear distance member and the periphery of the hub define an open space allowing free passage of the fluid.

Abstract: A propulsion device for exerting thrust to a fluid comprises a central hub and at least two propulsive arrangements which protrude radially from the hub. Each propulsive arrangement comprises front and rear propulsive elements extending from a front inner end to a front outer end and from a rear inner end to a rear outer end, respectively. Inner and outer guide elements extend from the front end to the rear end. An elongate front distance member and an elongate rear distance member extend radially from the hub to the inner guide element. At least one intermediate propulsive element is arranged between the front and rear propulsive elements and extends radially from the inner guide element to the outer guide element. The inner guide element, the front distance member, the rear distance member and the periphery of the hub define an open space allowing free passage of the fluid.

Abstract: A method for adjusting angle of attack feedback gain based characteristics and position of mounted stores, and a control system using the method.

Abstract: A vortex detection device suitable for use in fighter aircraft including an angle-of-attack sensor, an angle-of-attack processing unit connected to the angle-of-attack sensor capable of forming a signal representative of current air stream's angle-of-attack, a synthetic angle-of-attack estimation unit capable of forming a synthetic angle-of-attack signal, and a vortex level calculation unit connected to the processing and estimation unit, capable of calculating a vortex level signal, and a vortex detection unit connected to the vortex level calculation unit, for deciding, based on the vortex level signal, if a vortex is detected.

Abstract: A vortex detection device suitable for use in fighter aircraft including an angle-of-attack sensor, an angle-of-attack processing unit connected to the angle-of-attack sensor capable of forming a signal representative of current air stream's angle-of-attack, a synthetic angle-of-attack estimation unit capable of forming a synthetic angle-of-attack signal, and a vortex level calculation unit connected to the processing and estimation unit, capable of calculating a vortex level signal, and a vortex detection unit connected to the vortex level calculation unit, for deciding, based on the vortex level signal, if a vortex is detected.

Abstract: A method for adjusting angle of attack feedback gain based characteristics and position of mounted stores, and a control system using the method.

Abstract: The present invention relates to a method and a device for executing phase compensation in a control system of a motor-driven vehicle, in which the time derivative for an output signal (y) from a circuit (1) contained in the control system is limited relative to the time derivative for an input signal (u) to the circuit (1) if the time derivative for the input signal (u) exceeds a predetermined value. A difference signal (.epsilon.) is formed between the output signal (y) and a signal (x) present in the circuit (1), the time derivative of which is not limited in relation to the time derivative for the input signal (u). The difference signal (.epsilon.) is filtered via an asymptotically stable filter (3) to form a signal (.delta.), which is fed back and added to the input signal (u) of the circuit (1) to form the signal (x). A conventional rate limiter may be used to form the output signal (y) from the signal (x).