U.S. Patent Specifications

In an aircraft, a power plant, a cowling surrounding said power plant, a propeller driven by said power plant, a fairing mounted on said propeller and having an external contour which merges with the external contour of said cowling, an orifice in the upstream end of said fairing to permit throughflow of air to cool said power plant, an axially adjustable streamlined body extending from said orifice and shaped to vary the inlet area of said orifice, and means responsive to the air pressure anteriorly of said body for axially adjusting said body thereby to influence the airflow encompassing said fairway and said power plant.