Quote:
Originally Posted by BabyDiesel
70% after the rear tires?! Umm, that can't be road legal if I add that much to the rear of the car... lol.
I could not find Mair's torpedo. Do you have a picture?
That is an idea! I am curious to know what kind of drag reduction I would get with a setup such as the one you describe. I would hope for less than 0.20 Cd.
I made some *epic-fail* front skirts today. I am embarrassed to post them, they are that bad 
I am doing coast down testing tonight! We will see just how much improvement I have done to the ZX2. Stock Cd is 0.33, I am hoping for >0.3  I will be using the method spelled out here -> Measure the drag coefficient of your car |
Here is a depiction of Mair's boat tail research model without the cylindrical section.
Here is the full monty
Along the 'with skinny tires' line you can read off estimated Cd as a function of tail length.
Here you can see the relationship between fineness ratio and drag.Half-bodies based upon streamlined bodies would have about 2X the drag in ground proximity.
Here you see how the drag varies as a function of tail length on the M-B C-111 III
Here is Fachsenfeld's 'extensible' boat tail of the mid-1930s which Hucho felt the automotive community ought to revisit.
Here is the Land Speed Record EV1:lowered,taped up,flush wheel covers,and boat-tailed.The car was reported at Cd 0.14.
Here,Buchheim et al. has used a bit more aggressive contour with their Cd 0.14 VW-Flow body (long-tail)
The same car with truncated tail doesn't gain that much drag
