I think a Boeing 747-8IC could also take-off, cruise and land by using only 2 of its jet engines... O.k., with 2 engines you can only reach a lower speed on the runway but probably more uplift... Because if the air is faster underneath the wings then it is thinner, too which reduces uplift - so you don't need such a high take-off speed at all... That means I would reduce the number of engines in use and exploit sailing much more - approx. double wings instead of double engines...
Best wishes, Joseph de la Mikula and Team
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