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Old 09-01-2016, 09:35 AM   #2185 (permalink)
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Originally Posted by freebeard View Post
It's got a profile in the back that results in an internal Gurney flap. I wonder how that compares to a half-tonneau for effectiveness.
I have never done a half-tonneau cover, but I do have a full-tonneau cover and have experimented with different height rear spoilers/Gurney flaps.

If I recall correctly, once I shaved down my rear spoiler/Gurney flap to proper size the gas mileage was down perhaps 1 mpg, but the high speed stabilization was priceless - glued to the road, no lane wandering even in high winds at 80 mph.

I suspect this rat-rod truck gets some small amount of down-force which may equate to more drag. I'd worry about rain water intrusion but don't think that thing ever sees rain. Just looking at it makes my mouth dry.
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

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Rear Spoiler Pick Up Truck

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