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Under these conditions, blading becomes strictly a reaction kind design with the base of the blade solely impulse. As the volume increases, the blade top will increase, and the bottom of the blade spins at a slower velocity relative to the tip. This change in velocity forces a designer to change from impulse at the base, to a high reaction-style tip. Steam turbines had been pioneered by British engineer Charles Parsons(1854–1931), who used them to power a famously speedy motorboatcalled Turbinia in 1889. In a coal-fired plant, coal is burned i