Airplane in Start Wallpapers

Airplane in Start, Gala wallpapers: Fixed-wing aircraft is a term used to refer to what are more commonly known as airplanes in North American English and aeroplanes in Commonwealth English. An airplane is a heavier than air aircraft where any movement of the wings in relation to the aircraft is not used to generate lift. All aircraft wings flex and some aircraft have wings that can tilt, sweep back or fold but if none of these movements are used to generate lift the wing is considered to be a "fixed-wing". Fixed-wing aircraft include a large range of craft designed for many purposes from small trainers and recreational airplanes to large airliners and military cargo aircraft. Some aircraft use fixed wings to provide lift only part of the time and may or may not be referred to as fixed-wing. Airplanes have no ability to drive on the ground for extended time periods. The term also embraces a minority of aircraft with folding wings that are intended to fold when on the ground. This is usually in order to to ease stowage or facilitate transport on, for example, a vehicle trailer or the powered lift connecting the hangar deck of an aircraft carrier to its flight deck. It also embraces an even smaller number of aircraft, such as the General Dynamics F-111 Aardvark, Grumman F-14 Tomcat and the Panavia Tornado, which can vary the sweep angle of their wings during flight. In the early days of their development, these were termed "variable geometry" aircraft. When the wings of these aircraft are fully swept, usually for high speed cruise, the trailing edges of their wings abut the leading edges of their tailplanes, giving an impression of a single delta wing if viewed from above or below. There are also rare examples of aircraft which can vary the angle of incidence of their wings in flight, such the F-8 Crusader, which are also considered to be "fixed-wing". Two characteristics common to all the airplanes are the necessity of constant air flow over the wings for lifting of the aircraft, and an open area free of obstacles where they can, with sufficient space, take off or land. The majority of airplanes, however, also need an airport with enough infrastructure to receive adequate maintenance, restocking, refueling and for the loading and unloading of crew, cargo and/or passengers, when these are present in sufficient amounts. While the vast majority of airplanes land and take off on land, some are capable of take off and landing on ice, snow and calm water. The airplane is currently the fastest method of civil and military transport on the planet. Commercial jet airplanes can reach up to 875 km/h, and cover one fourth of the terrestrial sphere in a matter of hours, and single-engine airplanes are easily capable of reaching 175 km/h or more at cruise speed. Supersonic airplanes, currently only military, research and a few private aircraft, can reach speeds that sometime surpass the speed of the sound.