Efficiency can be gained by mounting a propeller behind the fuselage, because it re-energizes the boundary layer developed on the body, and reduces the form drag by keeping the flow attached to the fuselage.
12.
This design is believed to work because the combination of the gentle ramp angle and the curvature profile of the walls creates counter-rotating vortices which deflect the boundary layer away from the inlet and draws in the faster moving air, while avoiding the form drag and flow separation that can occur with protruding scoop designs.
13.
The drag force can be separated into two portions, " lift-induced drag ", which is inherent in the wing ( primarily arising from wingtip vortices ), and " parasitic drag ", including skin friction drag from the friction of air and body surfaces and form drag from the bird's frontal area.
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