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...correct me if I'm wrong, but isn't the back end of the "dolphin-like" Morrelli shape purpose to keep the aerodynamics from (a) creating positive lift (ie, a "wing") and trying to fly, as well as, (b) creating negative lift (ie, a "brake") and trying to create too much downward force?
...thus, to most efficiently have the separated upper and lower air streams re-converge as seamlessly and smoothly back together with absolute minimum drag creation?
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