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When we admire tanks, we often focus on their guns and armour, but the heart of every tank is its engine. In this video, we explore the amazing variety of power units that have propelled tanks from the dawn of their history to the present day. From the modest 105 horsepower petrol Daimler engine that drove the British WW1 tanks to the mighty 1,200 horsepower Perkins diesel that powers the Challenger 2, we will discover how engines have shaped the evolution of tanks.