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While there have been notional types with more than two engines, I'm unaware of any with 4. So, how practical would it be?
Given a POD of 1939, how would you mount them? Twin pods, like the Me-262? Over-under pods, like the Lorin Me-262? Or my favorite, a pair of o/u in the fuselage, like a twinned version of the BAC Lightning.
Also, why didn't anybody do this with the first-generation jets? Given how low their thrust was...