semihighspeed

Semihighspeed refers to a category of aircraft that operates at speeds between those of subsonic and supersonic aircraft. These aircraft typically cruise at speeds ranging from Mach 0.8 to Mach 1.2, which is roughly equivalent to 600 to 900 miles per hour (965 to 1,448 kilometers per hour). The term "semihighspeed" is not a standard classification used in aviation, but it is sometimes employed to describe aircraft that fall into this speed range.

Aircraft in the semihighspeed category often feature advanced aerodynamic designs to improve fuel efficiency and reduce drag at high subsonic speeds. These designs may include swept wings, supercritical airfoils, and other features that help to minimize drag and improve performance. Examples of semihighspeed aircraft include the Boeing 747, the Airbus A340, and the Tupolev Tu-204.

The semihighspeed category is important for long-haul air travel, as it allows aircraft to cover long distances quickly and efficiently. However, these aircraft may face challenges related to noise and emissions, particularly at high subsonic speeds. As a result, there is ongoing research and development in the field of semihighspeed aircraft to improve their environmental performance and reduce their impact on the environment.