The components were intended to replace nickel superalloy turbine blades or nozzle vanes. Flow rate may also be controlled by inlet vanes or outlet dampers on the fan. The hottest turbine vanes and blades in an engine have internal cooling passages. There may be many stages of rotating blades and fixed guide vanes. The rotor contains a number of sliding vanes, typically six. The engine include variable stator vanes (VSVs) and 3D printed parts. Cooling air for the turbine vanes undergoes a similar process. Five booster inlet guide vanes are fractured and eight outlet guide vanes are missing. These used a lever arm which moved hydraulically damped vanes inside the unit. The missiles are steered with a combination of control fins and through thrust vectoring vanes. Wraps can also make the future removal of vanes and fletching-glue much easier. Another solution was the use of variable inlet vanes. The inner vanes of the feathers have velvety barbules. The VDS body is a streamlined fairing fitted with Y-shaped hydrodynamic vanes for towing stability. The flight feathers are black with white on the basal portions of the vanes.