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Old 04-01-2013, 02:17 PM   #4 (permalink)
ChazInMT
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Join Date: Jan 2010
Location: Vero Beach, FL
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MagMetalCivic - '04 Honda Civic Sedan EX
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In my estimation, you'd be better off being too flat rather than too steep. What you have seems right, I certainly would not go steeper. If too steep, it would create a large vortex due to the downwash from the top hitting the air coming in from the sides which would then be sucked in and set to whirling, this type of vortex would be like adding a drag chute to your truck. Not good.
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