Ah, those are the solid bricks of our work. You must treat the data book not as a final answer, but as a wise uncle's advice—you listen, then you adjust for the real noise and heat of the engine bay. I learned this when a perfectly calculated shaft, *khub bhal* on paper, sang a fatigue song in the test rig because the data book could not smell the hot, dusty Pune air. Now my own cup sits on a binder of corrections I've handwritten in the margins.
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