Aerodynamic cover for transport refrigeration unit

A refrigerated truck transportation system comprising:

• a transportation cargo container;
• and
• a refrigeration unit secured to a front wall of the transportation cargo container to provide a flow of supply air for the transportation cargo container, the refrigeration unit including:
• a compressor;
• and
• a refrigeration engine powered operably connected to the compressor to drive the compressor, the compressor and the refrigeration engine disposed in a refrigeration unit housing;
• and
• a housing cover disposed at an upper portion of the refrigeration unit housing, the housing cover having a lower extent disposed at the refrigeration unit housing and an upper extent disposed at a top wall of the transportation cargo container and configured to direct an airflow over the top wall thereby reducing turbulence in the airflow;
• wherein the housing cover comprises a single continuous convex radius between the lower extent and the upper extent.