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Hello Max,
The gap is about three quarters of an inch. I think the smoke is behaving like it is in the picture in my earlier post because the attached air on top is meeting the attached air along the side of the Aerolid at the intersection of the two planes. Since the lid slopes back, the attached air runs out of surface to attach to on the sides and mixes with the air flowing over the roof.
The earlier Aerolid I built, the silver one, had a front surface which angles in and meets the angled surface of the rear of the cab. In the later version I built, the white one, I extended the forward surface of the Aerolid to cover the angled rear surface of the cab.
Both versions deliver about a 15% increase in fuel efficiency at freeway speeds. I do like the later version better as far as style goes.
Bondo
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