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Hydrodynamics: Part 2 – The Science and Art of Gearcase Hydrodynamics

In our recent Intro to Hydrodynamics post we discussed the impact of drag on escalating boat speed, and the importance of using the science of hydrodynamics to reduce that drag. The gearcase is the one component of a high-performance sterndrive or outboard that is always in the water, and thus subject to drag. Mercury Marine and Mercury Racing have a long history of developing gearcases for racing and high-performance applications, with the first Quicksilver racing gearcase and shortened midsection introduced in 1950 for the Kiekhaefer Mercury KG-7 Super 10 Hurricane outboard, which promised to increase top speed by 20 to 30 percent on the racing runabouts of the era.