Abstract: A method for attaching a bearing on a turbomachine including a stator and a rotor, the bearing including: a first portion attached on the stator of the turbomachine by a plurality of screws and nuts, a second portion attached on the rotor, rotationally movable in one given rotation direction, and a rolling bearing provided between the first and second portions of the bearing is disclosed. The method provides using screws having a screwing rotation direction contrary to the rotation direction of the rotor.

Abstract: The invention relates to a method for attaching a bearing (7) on a turbomachine comprising a stator and a rotor, the bearing (7) including: a first portion (73) attached on the stator of the turbomachine by a plurality of screws (80) and nuts (85), a second portion (74) attached on the rotor, rotationally movable in one given rotation direction, and a rolling bearing (70) provided between the first (73) and second (74) portions of the bearing. The problem addressed by the invention is that of improving the attachment of the bearing (7) by making it more reliable and more robust, particularly against unscrewing. In order to solve this problem, the method provides using screws (80) having a screwing rotation direction contrary to the rotation direction of the rotor.

Abstract: A sting for supporting and spinning small diameter models in a wind tunnel consistsing of a rear section securable within a standard wind tunnel, a cone shaped region at the front end of the rear section and a small diameter, model supporting, front section upon which a balance and a model can be mounted; an electric motor within the rear section aligned along the string axis; a drive gear mounted on the motor shaft; a driven shaft parallel to the motor shaft and extending from the motor to the cone shaped region, a driven pinion at the rear end of the driven shaft in meshing contact with the drive gear, a drive pinion at the front end of the drive shaft, a driving sleeve on the front section having a driving gear secured to its rear end and in engagement with the drive pinion, and a pair of spigots at the front end of the driving sleeve for contacting a model to be tested.

Abstract: A strain gauge balance consisting of an outer longitudinal shell and a monopiece inner center core; the outer shell having a open end and a closed end with a frustoconical bore extending towards the closed end, and the inner core having frusto conical shaped ends, one end being sized to fit within the frusto conical core and the other end being sized to fit into a sting; four radially extending, equally spaced, webs formed within the core and at each end of the core inboard of the frusto conical ends, and a central region of two longitudinally separated, semicircular cross-section parts each being formed within the part, with tensioning rings, one disposed diagonally to the other, and a number of strain gauges secured to the webs and the rings to determine induced strain in 6 degrees of freedom.

Abstract: A spin rig for spinning wind tunnel models has a support mountable on a sting, bearings for mounting the model on the support and an electric motor mounted on the support, inside the model. The motor has a stator fixed to the support and a rotor that is connected to the model. With a D.C. motor of high coercive force permanent magnet stator, the spin rig can be accommodated within a model small enough to be used in small wind tunnels. Tests can be run at constant, controlled spin. Model development costs are significantly reduced.