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I patterned my boattail after the tail cone of the Questair Venture, which is a 350mph kitplane nicknamed "the flying egg". I tufted the entire area of my rear window and it had attached airflow throughout. I can't see the rest of my boattail and I don't know of any fellow aero nuts living around here who could follow my car and make sense of what they were seeing, so I haven't been able to test the rest of the boattail's surfaces. But I've noticed that parts of cars that have recirculating airflow buffeting them usually get covered with crud, and my boattail stays clean except for a very small amount of crud deposited on the underside of the boattail.
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