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freebeard · 02-22-2013, 02:16 AM

Oh, I don't know, maybe it was this one:

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

It shows the same inset or slanted flaps, but sizes them at 1/4 the vehicle width.

02-22-2013, 02:16 AM	#50 (permalink)
freebeard Master EcoModder Join Date: Aug 2012 Location: northwest of normal Posts: 27,706 Thanks: 7,778 Thanked 8,586 Times in 7,070 Posts	Oh, I don't know, maybe it was this one: Fuel Savings by Means of Flaps Attached to the Base of a Trailer: Field Test Results It shows the same inset or slanted flaps, but sizes them at 1/4 the vehicle width.