OJ Props produce inboard boat propellers for various boats. They have been around for almost eighty years since starting out in 1936 by it’s founder Oscar Johnson along with his son Ivar. They make the highest quality and performance boat props you can buy for your up to about twenty five foot inboard ski or pleasure boat. These props are made out of...
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Volvo Penta was first to come out with a sterndrive with a single boat propeller in 1959 and they were first with a sterndrive that has two counter rotating boat propellers on a single prop shaft in 1982. The advantages of a sterndrive with two boat props are much less slippage that gives a better bite on the water, improved low speed steering...
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Sterndrives have the engine inside the boat connected to a drive unit and boat propellers located outside the boat, at the transom. The bottom of the drive unit looks like the gearcase of an outboard engine and in most cases really is. It is attached to a drive-shaft housing that is connected through the transom to the engine which transmits power through...
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The 1970’s, 80’s and 90’s. By the 1970’s outboard motors had evolved into tried and true basic designs and systems that carried over for decades with minor improvements along the way. Horsepower was always being increased in order top or at least compete with the other manufacturers. Boat propeller performance also had to be improved...
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When world war II ended in 1945, Mercury was ready with two new motor models. A 3.2 horsepower single cylinder called the Comet and the twin cylinder 6 horsepower named the Rocket. In 1947 the engines were redesigned with a much more modern look and a third model was added called the Lightning. This new model was a higher RPM, 20 cubic inch, 10 horsepower...
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