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Old 09-28-2008, 09:59 PM   #13 (permalink)
Big Dave
Master EcoModder
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Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,314

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
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Looks like you about where I am.

My take:
Hinges on the cab is not the right answer. The hinges will inevitably foul the air flow and the cab structure is not solid enough for anything heavier than paper. I intend to use a stout front bulkhead to operate the hinges.

We have discussed how far to taper down. For my 80" long bed my new fastback will truncate at 8-10 inches above the tailgate top. That gives me a 12 degree slope where the flow should stay attached all the way to the end. Mine is now 17 degrees and I may be getting flow separation.
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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