Abstract: To improve upon a fan blade (6) with regard to the use of materials and the weight, in particular a fan blade for smoke venting fans, having fastening means (5) for fastening the fan blade (6) onto a fan hub as well as having a blade section (7), it is proposed that the blade section (7) shall have an outer jacket (8) enclosing a cavity.

Abstract: A system and method are disclosed to attach a blade section (2) of a fan blade (1), in particular of a smoke extractor fan, to a fan hub, as well as a fan blade (1), which provides a high tensile strength even at high temperatures. The attaching part and fan blades (1) are to be produced so as to save as much weight as possible. The attaching part has a connecting section (5) embodied to produce a high-tensile connection to a blade section (2) of a fan blade (1). The connecting section can be arranged essentially in the interior of the blade section (2).

Abstract: In order to disclose attaching means (3) for attaching a blade section (2) of a fan blade (1), in particular of a smoke extractor fan, to a fan hub, as well as a fan blade (1), which provides a high tensile strength even at high temperatures, wherein the attaching means (3) and fan blades (1) are to be produced so as to save as much weight as possible, it is proposed that the attaching means (3) have a connecting section (5) embodied to produce a high-tensile connection to a blade section (2) of a fan blade (1), which connecting section can be arranged essentially in the interior of the blade section (2).

Abstract: In order to provide a ventilator hub having coupling elements for connecting to a ventilator spindle and an essentially cylindrical fastening section having radial adapters for a number of ventilator blades, whereby the fastening section has an inner casing surface that ensures fastening of the ventilator blades with sufficient tensile strength, even at high temperatures, such as they can occur in tunnel fires, without thereby having an undesirably high mass, it is proposed to provide the ventilator hub with an essentially annular, closed reinforcement element having coupling elements for fastening the ventilator blades with high tensile strength, that is designed essentially separate from the fastening section.

Abstract: In order to disclose attaching means (3) for attaching a blade section (2) of a fan blade (1), in particular of a smoke extractor fan, to a fan hub, as well as a fan blade (1), which guarantee a high tensile strength even at high temperatures, wherein the attaching means (3) and fan blades (1) are to be produced so as to save as much weight as possible, it is proposed that the attaching means (3) have a connecting section (5) embodied to produce a high-tensile connection to a blade section (2) of a fan blade (1), which connecting section can be arranged essentially in the interior of the blade section (2).

Abstract: To improve upon a fan blade (6) with regard to the use of materials and the weight, in particular a fan blade for smoke venting fans, having fastening means (5) for fastening the fan blade (6) onto a fan hub as well as having a blade section (7), it is proposed that the blade section (7) shall have an outer jacket (8) enclosing a cavity.

Abstract: In order to provide a ventilator hub (1) having means (2, 3) for connecting to a ventilator spindle and an essentially cylindrical fastening section (4) having radial adapters (6) for a number of ventilator blades, whereby the fastening section (4) has an inner casing surface (5) that ensures fastening of the ventilator blades with sufficient tensile strength, even at high temperatures, such as they can occur in tunnel fires, without thereby having an undesirably high mass, it is proposed to provide the ventilator hub with an essentially annular, closed reinforcement element (7) having means (10) for fastening the ventilator blades with high tensile strength, that is designed essentially separate from the fastening section (4).

Abstract: In order to disclose attaching means (3) for attaching a blade section (2) of a fan blade (1), in particular of a smoke extractor fan, to a fan hub, as well as a fan blade (1), which guarantee a high tensile strength even at high temperatures, wherein the attaching means (3) and fan blades (1) are to be produced so as to save as much weight as possible, it is proposed that the attaching means (3) have a connecting section (5) embodied to produce a high-tensile connection to a blade section (2) of a fan blade (1), which connecting section can be arranged essentially in the interior of the blade section (2).

Abstract: The surface effect vehicle comprises a plurality of lift fans for generating an air cushion, each of the fans having a drive with a motor and a regulating circuit with sensors and actuators for acting on the air cushion, each of the drives having an associated regulating circuit, the drive of the first one of the lift fans being operated as a master drive, while a rest of the lift fans being operated as follower drives.