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Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset. Face splines are used to couple two rotary components axially. The coupling is compact, self-centering and has a high torque capacity. It was developed by Albert Hirth, an engine manufacturer in Germany, and so is often also referred to as a Hirth joint or ...
Aircraft principal axes. An aircraft in flight is free to rotate in three dimensions: yaw, nose left or right about an axis running up and down; pitch, nose up or down about an axis running from wing to wing; and roll, rotation about an axis running from nose to tail. The axes are alternatively designated as vertical, lateral (or transverse ...
The vertical stabilizer is the fixed vertical surface of the empennage. A vertical stabilizer or tail fin[ 1 ][ 2 ] is the static part of the vertical tail of an aircraft. [ 1 ] The term is commonly applied to the assembly of both this fixed surface and one or more movable rudders hinged to it. Their role is to provide control, stability and ...
Linkages (silver) to the rotor blade. In aeronautics, a swashplate is a mechanical device that translates input via the helicopter flight controls into motion of the main rotor blades. Because the main rotor blades are spinning, the swashplate is used to transmit three of the pilot's commands from the non-rotating fuselage to the rotating rotor ...
Thrust vectoring. Thrust vectoring, also known as thrust vector control (TVC), is the ability of an aircraft, rocket or other vehicle to manipulate the direction of the thrust from its engine (s) or motor (s) to control the attitude or angular velocity of the vehicle. [1][2][3] In rocketry and ballistic missiles that fly outside the atmosphere ...
Bracing (aeronautics) In aeronautics, bracing comprises additional structural members which stiffen the functional airframe to give it rigidity and strength under load. Bracing may be applied both internally and externally, and may take the form of struts, which act in compression or tension as the need arises, and/or wires, which act only in ...
Power transfer unit. In aviation, a power transfer unit (PTU) is a device that transfers hydraulic power from one of an aircraft's hydraulic systems to another in the event that the other system has failed or been turned off. The PTU is used when, for example, there is right hydraulic system pressure but no left hydraulic system pressure.
Flight dynamics is the science of air-vehicle orientation and control in three dimensions. The critical flight dynamics parameters are the angles of rotation with respect to the three aircraft's principal axes about its center of gravity, known as roll, pitch and yaw. Aircraft engineers develop control systems for a vehicle's orientation ...