Hi All,
I am thinking that the difference between the 2nd and 3rd Gen Prius, besides the increased CdA of the 3rd, may be related to the lower rake of the 3rd Gen Prius windhield. You may know I am of the opinion the 3rd Gen is just not as good at higways speeds based on coasting performance at specific locations on my commute. Thus this discussion is interesting to me.
Rather than put the bubble on top of the roof, put it on the upper 1/4 of the windsheild and make it widthwise. Now, you keep the flow attached, and maybe the flow over the top balances with the flow around the sides?
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