Because of the Doppler-effect air gets slow and thick after an aircraft that leaves it and this might be an important reason for turbulances... By a little opening at the tail of the airplane you could allow this air behind the airplane that otherwise contributes to drag to stream back right into the auxiliary power unit... This way the efficiency of the auxiliary power unit could be increased and the drag of the entire aircraft could be reduced...
Best wishes, Joseph de la Mikula and Team
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