A method for balancing a set of blades intended to be arranged on a bare disc of an aircraft engine, the bare disc comprising a defined number of numbered cells (ai) intended to receive the same defined number of blades, which can have a spread of mass, the method comprising the following steps:—sorting the blades by monotonic order of their mass (mi) to form an ordered set of blades,—separating the ordered set of blades in a balanced manner into four lobes constituted by a first large lobe, by a second large lobe, by a first small lobe and by a second small lobe, the blades being classified into each lobe according to a current placement order, and—arranging the four lobes on the bare disc by making the current placement order of the blades correspond to the numbered cells of the bare disc.

A method for balancing a set of blades intended to be arranged on a bare disc of an aircraft engine, the bare disc comprising a defined number of numbered cells (ai) intended to receive the same defined number of blades, which can have a spread of mass, the method comprising the following steps:—sorting the blades by monotonic order of their mass (mi) to form an ordered set of blades,—separating the ordered set of blades in a balanced manner into four lobes constituted by a first large lobe, by a second large lobe, by a first small lobe and by a second small lobe, the blades being classified into each lobe according to a current placement order, and—arranging the four lobes on the bare disc by making the current placement order of the blades correspond to the numbered cells of the bare disc.

A dynamic balance testing device includes a vibrating unit configured to rotatably hold a predetermined rotating body being a specimen, a first spring configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a direction parallel to a rotation axis of the predetermined rotating body, and at least three second springs configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a predetermined direction orthogonal to the rotation axis. The at least three second springs are attached to the vibrating unit on a same predetermined plane, and the vibrating unit holds the predetermined rotating body such that a projection of a center of gravity of the predetermined rotating body onto the predetermined plane is substantially at the same position as a position where the first spring is attached to the vibrating unit.

Provided is an apparatus capable of transporting a rotor from a first location to a second location, including: a holding device for engaging with a portion of the rotor at the first location so as to hold the rotor relative to the apparatus; a position determination device for determining the position of at least one component part of the rotor relative to another component part of the rotor or another body; a positioning device for positioning or repositioning said at least one component part of the rotor relative to another component part of the rotor or another body; and a movement device for moving the rotor from the first location to the second location. Also described is a method of loading a rotor into a balancing machine.

Provided is an apparatus capable of transporting a rotor from a first location to a second location, including: a holding device for engaging with a portion of the rotor at the first location so as to hold the rotor relative to the apparatus; a position determination device for determining the position of at least one component part of the rotor relative to another component part of the rotor or another body; a positioning device for positioning or repositioning said at least one component part of the rotor relative to another component part of the rotor or another body; and a movement device for moving the rotor from the first location to the second location. Also described is a method of loading a rotor into a balancing machine.

A non-destructive device that measures the accuracy potential and relative ballistic coefficient of projectiles, by placing the object tested within a swirling vortex having both a rotational and vertical vector, hovering the projectile essentially above the device, and essentially unencumbered by any stator. A perfectly balanced object hovers and turns at a high rate about its long/vertical axis without contact with the device.

A non-destructive device that measures the accuracy potential and relative ballistic coefficient of projectiles, by placing the object tested within a swirling vortex having both a rotational and vertical vector, hovering the projectile essentially above the device, and essentially unencumbered by any stator. A perfectly balanced object hovers and turns at a high rate about its long/vertical axis without contact with the device.

An aircraft weight and balance data management system includes a central server storing weight and balance data thereon which communicates over a communications network with computer devices belonging to both pilot and maintenance persons respectively. The system i) receives up to date data from maintenance persons, ii) calculates weight and balance specifications for aircraft according to data from maintenance persons, iii) communicates the specifications to a pilot, and iv) calculates variations to the specifications for a loaded aircraft for all fuel burn scenarios. The system communicates up to date weight and balance information relating to large numbers of aircraft configurations to a central location such that all maintenance personnel and pilots have access to the same up to date information.

An aircraft weight and balance data management system includes a central server storing weight and balance data thereon which communicates over a communications network with computer devices belonging to both pilot and maintenance persons respectively. The system i) receives up to date data from maintenance persons, ii) calculates weight and balance specifications for aircraft according to data from maintenance persons, iii) communicates the specifications to a pilot, and iv) calculates variations to the specifications for a loaded aircraft for all fuel burn scenarios. The system communicates up to date weight and balance information relating to large numbers of aircraft configurations to a central location such that all maintenance personnel and pilots have access to the same up to date information.

An imbalance measurement machine for determining tire imbalance has a hollow shaft rotatably driven relative to a fixed hollow axle. A tubular air feed for filling the tire with air is centered within and rotates with the shaft to rotate the tire for determining imbalance. An air hose is connected to a rotational coupling disposed at an air feed end that faces away from the tire. Force transducers between the axle and a machine bed measure forces that occur there during operation. The air hose is attached not only to the rotational coupling but also to the axle, at a distance from the rotational coupling. An alternative embodiment omits the rotational coupling and fills the tire in the resting state of the shaft, via the air hose and the non-rotating air feed. Subsequently, the air hose is separated from the air feed, and the tire retains the supplied air.