時間：2011-03-11 23:18來源：藍天飛行翻譯 作者：航空 點擊：次
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von Ohain, Dr. Hans Pabst. The designer and developer of the first turbojet engine to actually power an airplane. Von Ohain’s HeS3b engine was built in Germany by the Heinkel Company, and it flew in a Heinkel HE-178 airplane on August 27, 1939. VOR (very-high-frequency omnirange navigation equipment). A type of electronic navigation equipment in which the instrument in the cockpit identifies the radial, or line from the VOR station measured in degrees clockwise from magnetic north, along which the aircraft is located. VOR is a phase-comparison system in which two signals transmitted simultaneously from a ground station are in phase only when they are received at a location directly magnetic north of the station. At a location magnetic east of the station, they are 90° out of phase. At magnetic south, they are 180° out of phase, and west of the station, they are 270° out of phase. The pilot selects on the omni bearing selector (OBS) the radial on which he wants to fly, and the needle of the course deviation indicator (CDI) centers when the aircraft is on the radial. If the aircraft moves off the radial, the needle moves away from center to show the pilot which direction to turn to return the aircraft to the radial. The indictor for the VOR is often also used as the localizer indicator. VORTAC (electronic navigation system). An electronic navigation system used by both military and civilian aircraft. The name VORTAC is the combination of the names of two types of navigation equipment: VOR, very-high-frequency omnirange navigation equipment, and TACAN, a military pulse-type tactical navigation system. VOR and TACAN equipment are colocated at a VORTAC station, and signals from both systems are transmitted simultaneously. |
