National Geographic : 1965 Mar
PHOTOGRAPHED UNDERWATER ATFLORIDA'SSILVERSPRINGS What has the propulsion efficiency of an outboard and the fuel economy of an inboard? MerCruiser Stern Drive: A MerCruiser is the most efficient underwater unit you can buy. It is more efficient than a conven tional inboard because, like an outboard, it ap plies the propeller thrust directly parallel to the plane of motion instead of down ward at an angle. Unlike an inboard, MerCruiser has no fixed shaft, strut, rud der and skeg to cause underwater drag or turbulence around the propeller. Mer Cruiser's exclusive Jet-Prop also reduces drag by filling the vacuum pocket behind the propeller hub with exhaust gases. All MerCruisers have economical 4-cycle marine engines that develop high torque at low rpm. There's no need to mix the fuel and oil... and they operate quietly and efficiently on regular fuels. Propulsion efficiency and fuel economy are just two of the reasons to buy MerCruiser. Ask your MerCruiser dealer to show you some others like: the eight MerCruiser engines covering the 60 to 310 hp range ... MerCruiser's exclusive protection fea tures such as hydraulic shocks, safety tilt, rubber safety clutch, one-piece lower unit housing. Ask him to show you all the reasons why more people buy MerCruiser than all other stern drives combined...60, 110, 120, 150, 190, 225, and 310 hp gasoline; 60 hp diesel. ' STERN DRIVE POWER PACKAGES © 1965, Kiekhaefer Corporation, Fond du Lac, Wisconsin, and Toronto. Subsidiary of Brunswick Corporation.