| |
| |
Aircraft - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-07) |
 | | Fixed-wing aircraft generally use an internal-combustion engine in the form of a piston engine(with a propeller) or a turbine engine (jet or turboprop), to provide thrust that moves the craft forward through the air. |
 | | In the case of aerodynamic lift, the aircraft is kept in the air because of aerodynamics, usually by means of wings, or rotors, of some kind. |
 | | The major distinction in aircraft usage is between military aviation, which includes all uses of airplane for military purposes (such as combat, patrolling, search and rescue, reconnaissance, transport, and training), and civil aviation, which includes all uses of airplanes for non-military purposes. |
| encyclopedia.worldsearch.com /aircraft.htm (1677 words) |
|