ABSTRACT
Aero gas turbines have an exhaust system that passes the turbine discharge gases to atmosphere at a velocity and direction appropriate to the flight condition. Thus, it provides the thrust force required for all flight conditions except in landing where it may provide through the thrust-reverse system the dragging force needed for aircraft stopping at an appropriate distance. For turbopropeller engines, the major part of thrust is developed by the propeller, and the exhaust gases have little to contribute in that activity.
