Quote:
Originally Posted by orbywan
Does anyone know, is a rounded shape like the one shown in the diagram the most efficient, or should the sides be straight? I guess it's time to order that book on fluid dynamics.
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Ideally it should be rounded, tapering on all sides, and ending in a point, but in the real world it is often ended in a small flat plate where a licence plate and tail lights can be mounted, and where ventilation and/or engine cooling exhausts can be discharged to help fill the tiny void behind the small flat plate. Use the Aerodynamic Streamlining Template pictured in the thread with that name as a pattern in designing your boattail.