NacellesTypes: Nacelles can be either fixed or movable, and they house and protect the aircraft engine.Materials: Common materials used in nacelle construction include carbon fiber reinforced polymers (CFRP), titanium, and aluminum alloys.Thrust ReversersTypes: Thrust reversers are devices that reverse the direction of thrust to provide braking force during landing.Mechanisms: Thrust reversers utilize various mechanisms to achieve thrust reversal, such as cascaded vanes, translating cowls, and clamshell doors.