I have been doing some research on futuristic aircraft designs and came across the D8 "Double-Bubble" aircraft. One of the main benefits that this aircraft has over conventional airliners is the increase in fuselage carryover lift, which results in a reduction in the spanwise length of the wing.
http://web.mit.edu/drela/Public/N+3/tasaa.pdf
In addition to this, the nose design is interesting but confusing at best. Apparently the nose produces nose lift and a nose up pitching moment, thus a smaller horizontal tail can be designed. Can anyone clarify why this is the case, as I am very confused by it all.