A microelectromechanical system based fluid ejector comprises an ejector nozzle, a chamber that communicates with the ejector nozzle, and a plurality of movable ejection structures associated with the ejector nozzle and arranged to move in the chamber such that a variable volume of fluid is ejected from the associated ejector nozzle. One leading edge has a triangular cross-section, while the other has a cross-section similar to a parallelogram. The composition is totally non-flammable under all reasonably foreseeable conditions of use. Thus, when the core airflow begins to expand in a high-energy gas stream, it has a substantially axial path from the combustion chamber through the turbine. When heated simultaneously, the different coefficients of thermal expansion of chamber and mandrel cause the chamber to expand more than the mandrel, creating a natural tension along mandrel resulting in a near perfectly straight shaft.