In the military, shutting down one or two engines to save fuel is a relatively common practice. Crews flying maritime patrol aircraft such as Lockheed’s Orion or Britain’s Nimrod had the ability to shut down two engines while in high-altitude cruise, allowing them to increase endurance. Such practices are also common in the military helicopter world, particularly during long-range flights. But now helicopter manufacturers and engine suppliers are hoping they can sell a similar ...

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