Quote:
Originally Posted by Piwoslaw
Hard to believe that a boattail like the one in your pics wouldn't have any effect 
What speed were you testing at? For the tests you might want to try a slightly higher speed than you would normally be driving, just to exaggerate the results.
When I tested my aero mods I did passes at 70 and at 100 km/h to see the difference. |
What looks aerodynamic sometimes is not. The 18 degree angle is likely still too large and flow is separating. (Which is why the commercial version has a 11 degree angle)