Propulsion

Propulsion is a means of creating force leading to movement. The term is derived from two Latin words: pro, meaning after or forward; and pellere, meaning to drive. A propulsion system consists of a source of mechanical power, and a propulsor (means of converting this power into propulsive force).

A technological system uses an engine or motor as the power source, and wheels and axles, propellers, or a propulsive nozzle to generate the force. Components such as clutches or gearboxes may be needed to connect the motor to axles, wheels, or propellors.

Biological propulsion systems use an animal's muscles as the power source, and limbs such as wings, fins or legs as the propulsors.

Vehicular propulsion

Air propulsion

An aircraft propulsion system generally consists of an aircraft engine and some means to generate thrust, such as a propeller or a propulsive nozzle.

An aircraft propulsion system must achieve two things. First, the thrust from the propulsion system must balance the drag of the airplane when the airplane is cruising. And second, the thrust from the propulsion system must exceed the drag of the airplane for the airplane to accelerate. In fact, the greater the difference between the thrust and the drag, called the excess thrust, the faster the airplane will accelerate.

Union

Union is the state of being united or joined.

Union may also refer to:

Labor

Education

History and politics

Union Township, New Jersey

Union Township, New Jersey is the name of several places in New Jersey:

Existing townships

See also:

Defunct municipalities

See also

Union (Toni Childs album)

Union is the debut album of the American singer/songwriter Toni Childs. Released in 1988, the album peaked at #63 in the US (where it has since been certified Gold for sales of over 500,000 copies). It also peaked at #1 in New Zealand where it was certified 5x Platinum (75,000 copies sold).

The album was recorded in London, Paris, and Swaziland. Following its release, Childs was nominated for two Grammy Awards (for 'Best New Artist' and for 'Best Rock Vocal Performance (Female)' for the single "Don't Walk Away").

Track listing

All songs written by Toni Childs and David Ricketts except as indicated.

Personnel