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That last one's gorgeous. I'd like a 1:43 model of it!
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Thanks. Models scales drive me nuts. 1/10th? 1/18th? 1/24/25th!?! 1/32nd? 1/35th (military)? That said, I like 1/43 (easy to store), and 1/24th (1/2 dollhouse scale or 1/2" to the foot).
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You could probably mount some NACA inlets on the C pillar area of the boat tail and duct air past the cooling outlets, finally exiting the rear of the tail. The air moving through the ducts and into the wake would suck the cooling air right out, and probably not add too much drag- especially when compared to not having an upper part.
Actually, put the inlets up top like an RS200 (but of course use NACA ducts):
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I'm picturing something sort of horn-shaped, that would have a horizontal slot that overhangs the drip rail and 'eats' the vortex that is trying to form as the air spills over the drip rail. But, yeah...
And that exit duct? Coanda Nozzle.
Back in the 50s, someone raced a Porsche that had the exhaust pipe on each side in the center of a high-bypass duct that pulled air through the engine. No mechanical fan. [citation needed]
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This is the one I'd choose, but it might be worth the effort of smoothing out those interior corners that develop between the rear fenders and the body sides. Think about building a custom rear bumper?
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I understand about filleting, but I also consider buildability. These renderings are only approximate. I can hold the parts up against each other, but I can't Boolean AND them together—yet. The lighting and rendering comes easy; the modelling, not so much.
The next round will have the upper part shortened forward to where the bike rack sits now. In fact if I chop the rack about 2—3" it would work perfectly. The lower part will extend back about one foot (down from 18"), and be curved to the contour of the stock rear bumper. Two 1/8"x3"x16" steel straps would relocate the bumper and carry any diffuser parts required.
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It would be neat to find a ratty Bug body , hack it off where your boat tail begins, and build a new rear end with perfect curvature.
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Last thing.
If you're doing this version, use some '63 Thunderbird taillights to make it look like a rocket ship. And add NASA logos to the side
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Always one of my favorites. I wonder what they weigh.
Maybe something about the size of a 5-gallon bucket lined with red LEDs, with a soap bubble generator fed by pumped engine cooling air?