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Old 02-28-2013, 12:35 PM   #69 (permalink)
freebeard
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Your modification looks well done. For the back consider the open tapered box. Reference materials at:

Effect of rear body taper on a simple body

http://bioage.typepad.com/greencarco...on-Project.pdf

Fuel Savings by Means of Flaps Attached to the Base of a Trailer: Field Test Results

Simpler construction than a boattail and you add 1/4 the vehicle's width or less in length.
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