The helicopter is mainly composed of the fuselage and the three major systems of lift (including rotor and tail rotor), power and transmission, as well as on-board flight equipment. The rotor is generally driven by a turboshaft engine or piston engine through a mechanical transmission system consisting of a drive shaft and reducer, etc. It can also be driven by the reaction force generated by the jet from the tip of the paddle.
Helicopters are a type of airplane whose most important feature is the upward force provided by one or more large, horizontally rotating rotor blades. Helicopters can lift vertically, remain motionless in mid-air (hover), or fly backwards, a distinguishing feature that makes them useful in many situations. The helicopter's outstanding anti-tank capability is what makes it an indispensable part of modern warfare. The disadvantages of helicopters are rotor resistance, low speed, high fuel consumption, short range, large radar reflective area in the war, vulnerable to ground combat weapons attack.
Expanded Information
There have been many incentives in the history of helicopter development.
1, the world's first helicopter was the vs300 developed by Sikorsky, which really had the flight characteristics of a modern helicopter. The use of single rotor with tail rotor structure, laid the most commonly used aerodynamic layout of modern helicopters.
2, the world's smallest helicopter is the Japanese development of a single super small helicopter. The helicopter is installed with a 37-kilowatt forced cooling engine, the main rotor diameter of about 6 meters, weighing only 115 kilograms.
3, fly the farthest helicopter is the United States of America's OH-6 helicopter. 1966 April 6 ~ 7, the aircraft by the pilot Ferry driving, created a straight-line range of 3561.55 kilometers of the world record.
4, the earliest helicopter airborne combat is the U.S. Army in March 1951 in the Korean battlefield Wang Fangshan battle implementation. In this battle, the U.S. Army used helicopters to airborne more than 20 people on the position, with ground forces to capture the other side of the position. This is the earliest record of helicopters participating in actual combat.
5. The first helicopter to use an ejection system was the Soviet Union's Ka-50 "gimmick" helicopter. The aircraft also won the first single-seat attack helicopter and the first **** shaft-type attack helicopter two world firsts.
Baidu Encyclopedia - Helicopter