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Old 08-12-2017, 01:54 PM   #200 (permalink)
aerohead
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3.81:1

Quote:
Originally Posted by Vman455 View Post
Some more work on the tail today. I had a couple trips to Kansas in the last month, and just to try out the cargo carrier I installed a box temporarily on back:



Now that I've been home this week, I got some 2" foam board and cut a piece large enough to be the platform for the streamlined tail:



Since I frequently carry bikes in back and use the car for sleeping in on road trips, I wanted to preserve hatch access. The tail is spaced 6" away from the bumper edge to facilitate this, just enough so I can stand between the tail and bumper, and exactly enough clearance for the hatch to swing upward and clear the box.

I took the plan taper from the rear bumper cover--which turned out to be more aggressive than I thought, 12 degrees--and extended it with a straightedge onto the tail platform:



Then, I gradually tapered the angle to 21 degrees at the end of the tail.



Cut out one side:



And then the other:







You'll barely be able to see it coming down the road:



The tail itself is 36" long, giving the car a total 42" extension from the rear bumper edge for a total length of 218", 9" longer than a regular cab 6.5-foot bed F-150. Length/depth ratio of the vehicle system will be 3.81:1, up from the stock 2.99:1, and the width of the tail at the back is 35", a little more than half the width of the car at the rear bumper.
For comparison:
*2005 AeroCivic 3.719,Cd 0.17
*1983 GM Aero 2002, 3.854:1,Cd 0.14
*1983 Ford Probe-IV, 3.828:1, Cd 0.154
*2013 CUER, 4.071:1, Cd 0.11
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