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Douglas MacCullagh (Dougmac)

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Posted on Wednesday, February 23, 2005 - 10:53 pm:   

The tanks work differently. Tanks typically have 3 or more forward gears. The second differential is driven directly by the engine, and whether you turn left or right is controlled by steering brakes. You get a 0 radius turn in neutral, and progressively wider turns as the gears go up. However, you still have only one turning radius for each gear. The best diagrams & discussions I've seen have dealt with the Merritt-Brown gearbox used in WWII Churchill tanks. Continuously variable turning radii in all gears requires a triple differential gearbox, and I still do not have a real strong handle on how they work.