The Napier Sabre is a British H-24-cylinder, liquid-cooled, sleeve valve, piston aero engine. The engine evolved to become one of the most powerful inline piston aircraft engines in the world, developing from 2,200 hp (1,600 kW) in its earlier versions to 3,500 hp (2,600 kW) in late-model prototypes. Early problems with the engine's sleeve valves resulted in engine seizures, but these were resolved with improved metallurgy and manufacturing methods.
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