Apparatus, systems, and methods are disclosed that operate to drive an output with a data signal and to boost a potential of the output in response to a boost signal. The first housing member includes a housing body portion in which the recess portion is formed, and a discharge-side cylindrical portion formed integrally with the housing body portion so as to define a discharge passageway of the cooling water. The lateral opening has an inwardly extending surface for providing a first locking surface. in an atmosphere containing oxygen to form a sintered body that is pulverized back to a powder. The configuration of this invention combines the efficiency and performance of a single engined aircraft with enhanced safety advantages.