Gulfstream Aerospace was planning to equip its newest jet, then under development, with four Rolls-Royce RB401 engines, each rated at 7,000 lb. thrust. But when word reached Gulfstream's headquarters in Savannah, Georgia, that the British engine-maker was developing a refanned version of the Spey engine, which powered the Gulfstream Ⅱ and Ⅲ, the planemaker asked for details. And Rolls obliged.
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