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Originally posted by ch1466
I have to assume that it is an aerodynamic feature (similar perhaps to the gull 'step' on the Spitfire), but it may also be related to getting a deeper wingroot for a unified wingbox mount with a composite fuselage, added fuel (quite a few bizjets are not in the 3K+ legs range and some of the Gulftreams etc. are up to 6 I guess) or added baggage stowage reasons.
Originally posted by ch1466
Other things to be asked:
Does the keel effect of the engine pylon help or hurt in terms of stability and empennage drag? Do you get any adverse fencing effect with roll at yaw or similar coupled maneuver modes beyond straight and level?