I did these test runs back on Dec. 3, 2011.
The results weren't very encouraging which is one reason I didn't post them earlier, sorry.
The results seem to show that the best version was the three panel one. The "better" design that would have been a full Kamm back all the way back, did not do as well.
See pic of four panel version below.
- Three panel version was the two side panels plus the "dropped" rearmost center panel, approximately parallel to the trunk lid.
- Four panel version had a roof extension panel coming off the roof extending over the rear glass (see pic below).
- Full cover had one more panel that completed the roof extension all the way back to meet the dropped panel's rear edge. So had it been done cleanly, that would have been a nice full Kamm back to a point even with the rear bumper.
Spoiler----- -----------Start--End--MPH
Version------Time------MPH--MPH--drop
Full cover---02:39 PM--65.4--48.0--17.4
Full cover---02:46 PM--67.6--49.2--18.4
Full cover---03:00 PM--68.6--50.5--18.1
Full cover---03:08 PM--65.6--48.3--17.3
Four panel--03:33 PM--67.3--49.3--18.0
Four panel--03:38 PM--69.0--51.0--18.0
Four panel--03:46 PM--64.7--48.8--15.9
Four panel--04:00 PM--68.7--51.0--17.7
Three panel-04:20 PM--66.8--51.8--15.0
Three panel-04:34 PM--67.0--51.4--15.6
Three panel-04:42 PM--67.1--50.8--16.3
No spoiler---05:20 PM--67.6--48.3--19.3
No spoiler---05:25 PM--67.1--49.0--18.1
No spoiler---05:32 PM--66.2--49.0--17.2
No spoiler---05:40 AM--68.6--50.0--18.6
The four panel and full cover versions should have been better than the 3-panel one. I finally deduced I hadn't built it very well, with the roof extension panel lifting up at the forward corners and just not sitting right. In April 2012 I built an improved version of the roof extension that worked well, I'll post some detail on that later.
Four panel version:
