Although there are a number of "stretched" planes out there, I want to focus on 2 models in particular: The 737-900 and the 767-400.
Those planes represent the longest stretches of any plane from the original design. Both are so long as to look almost comical.
So what are the limits that which an airliner design can be stretched? Taking into account the center of gravity, how long can a plane be made before it would be at risk of collapsing from under its own weight?
Also what about rotation considerations at takeoff? The 739 in particular looks to me like it cannot achieve a very high AOA at rotation because the exceedingly long fuselage and the fact that it has original 737 landing gear-which means it sits like a Mexican low-rider to the ground-would put the plane at risk of scraping the underside at very high speed.
Would taller landing gear alleviate these problems?
Is this a genuine concern or am I overlooking something?