Air encircling marine propeller apparatus

摘要

An air encircled marine thruster cowling includes a cowling that surrounds a propeller and provides an annular blanket of air around the slipstream from the propeller. The cowling includes an inner conical section around the propeller and an outer tubular section around the conical section to form an annular space around the conical section. A duct leads exhaust gas from the engine into the annular space, and an additional duct leads moving ambient air into the annular space, as when a boat is in motion.