1 INTRODUCTION 1.1 Design Target 1.1.1 Supersonic Civil Aircraft The international civil aviation industry have been pursuing the improvements of flight speed since we entered the era of jet engines in the 1950s when the jetliners was continuing to mature.The market of supersonic transportation is also optimistic.If civil aircrafts could achieve the goal to flying faster than the sonic,the speed of aircrafts would improve more than twice,which would greatly shorten the time of long flight. 1.1.2 Business Aircraft Business aircrafts are the ones which are used as vehicles for administrative matters or commercial activities.They are usually small aircrafts less than nine tons carrying 4 to 10 people.But in some places special planes of the presidents,kings and members of the royal families are also included in the scope of general aviation.This makes large aircrafts,like Boeing 747,can also be placed into the rank of business aircrafts. 1.1.3 Our design target:SBJ Supersonic flight will enable businesses to manage global operations more efficiently and consider more investment opportunities.They will be closer to their customers, more often.It will let passengers enjoy life more by spending less time in the air. Under the current situation,we determined our design target:SBJ.SBJ is a supersonic business jet which caters to wealthy clients or senior executives of large commercial groups. 1.2 Market Analysis 1.2.1 National Policy The general aviation industry of new China was built in 1951.As was well received in the various departments,it got rapid development.General aviation aircraft had the flight operation time of 39739 hours in 1979.However,the average flight operation time was always about 40000 hours ever since then.Under the big background of swift and violent development of China's economy,GDP had gone up more than 26 times,while the general aviation market was continuing to be down turn.Table 1-17 1 INTRODUCTION 1.1 Design Target 1.1.1 Supersonic Civil Aircraft The international civil aviation industry have been pursuing the improvements of flight speed since we entered the era of jet engines in the 1950s when the jetliners was continuing to mature. The market of supersonic transportation is also optimistic. If civil aircrafts could achieve the goal to flying faster than the sonic, the speed of aircrafts would improve more than twice, which would greatly shorten the time of long flight. 1.1.2 Business Aircraft Business aircrafts are the ones which are used as vehicles for administrative matters or commercial activities. They are usually small aircrafts less than nine tons carrying 4 to 10 people. But in some places special planes of the presidents, kings and members of the royal families are also included in the scope of general aviation. This makes large aircrafts, like Boeing 747, can also be placed into the rank of business aircrafts. 1.1.3 Our design target: SBJ Supersonic flight will enable businesses to manage global operations more efficiently and consider more investment opportunities. They will be closer to their customers, more often. It will let passengers enjoy life more by spending less time in the air. Under the current situation, we determined our design target: SBJ. SBJ is a supersonic business jet which caters to wealthy clients or senior executives of large commercial groups. 1.2 Market Analysis 1.2.1 National Policy The general aviation industry of new China was built in 1951. As was well received in the various departments, it got rapid development. General aviation aircraft had the flight operation time of 39739 hours in 1979. However, the average flight operation time was always about 40000 hours ever since then. Under the big background of swift and violent development of China’s economy, GDP had gone up more than 26 times, while the general aviation market was continuing to be down turn. Table 1-1