|Quoting Waterpolodan (Thread starter):|
possibility of a 450 seat twin in the future, and people were theorizing that it would require engines with 160,000 pounds of thrust
It all depends on how far you want to fly.
An A321 can move half that number of pax on two 30,000 lbs engines. So a twin taking 450 pax over a max 321 range would need no more than 60,000 lbs engines.
You could also just modify an A380 with two GE
-90-115B and it would take 550 pax, not 7-8,000nm, but maybe 2-3,000nm.
A B777-200LR is supposed to take some 250+ pax over some 8,200nm. We can modify it with extra underfloor tanks, and it would take zero pax some 9,500nm instead. We could also make it twin deck, stuff in 450 pax, and probably fly them 4,000nm.
Very high powered engines are more for long range than for high number of pax. That's logical because a long range plane lifts a fuel weight which is many times heavier than the payload weight.
But anyway, would a 160,000 lbs engine be feasible? If it had to retain the 115B fan dimentions and rely on higher N1 speed, then the first thing to worry about would be that it would be too noisy to be certified for civil flight today. So it will definitely have to be larger.
Would such a twin be feasible? I doubt. I quad would do the same job on four 60,000 lbs engines. Or even less than that because it would have a much more favorable weight distribution on the wing. The twin would need a much stronger and heavier wing to support those two 160,000 lbs engines. Greater fan diameter would for ground clearance call for longer, stronger and heavier landing gear.
An A380 will take 550 pax in three classes far away on four times 70,000 lbs = 280,000 lbs installed thrust. On two times 160,000 = 320,000 it would never do the same job. It would need more like two times 200,000 lbs. Maybe more because structure weight mainly on wing and landing gear would have to grow considerably.