Your Kamm-back is trying to be more template-like (half-round) but you're up against the limitations of the template. It's dependent on the upstream conditions, and really needs to start at the stagnation point at the front.
That patch of clear glass. Was it caused by the airflow or was that an adjustment for visibility's sake? Otherwise the trident shape is way interesting and is going right into my 'snerodynamics' folder. The outer tips show the taper the roof wants and the center tip shows there are vortexes being generated. The buildup on top of the Kamm-back shows the influence of the upstream conditions.
Quote:
|
I'm not sure I follow... do you mean cut the body of the car??
|
Two question marks?
"Anyone can restore a car, it takes a real man to cut one up."
"Cut. Weld. Drive."
...you get the idea. Cut a tall narrow C-shaped slit betwen the gas-cap/wheel well and the tailight. Push the back edge in and fill the corners. You have an air intake of maybe 24sq in.
Then skin the rear bumper and there should be a plastic egg-crate reinforcement, drill out the bottoms of all the cells. Cover it with used trampoline material.
_____
IMHO the best suggestion you've got was from kach22i:
The top is so close to right, stock; the only thing the Kamm-back is probably doing is causing concern among your neighbors.
A thin aluminum Gurney flap affixed to the top of the backlight is probably the most you need.
_____
Remember half the drag is from underneath and the very rear. Think about a diffuser.