here are some pictures...
it was really dark outside so i'd have to use the flash. I apologize for the state of my car... i've washed it last week, but it's been raining a lot since,my fingers left greasy prints and on top of that some stupid bird has pooped on it.
there used to be 5 cones roughly 7 cm apart (the distance between the roof rack attachment strips is about 60cm) but i pulled the outer ones of...yet the glue seems sufficient to hold them in place even when they get wet, certainly for testing, once you pull them off however they wont stick again...
here's how they look:
the dirty streaks near the edge seem to be a result of the cones.
having driven with them for 2 days and only having my standard fuel gauge as i guide i'd say they're not boosting my FE a great deal. it's either normal, or slightly worse so maybe i'll just pull them off tomorrow.
the car does feels a little different though.
it somehow feels shorter when taking a curve at speed.
i think the cones might be acting more like a spoiler. actually creating a ridge of turbulence. the smooth oncoming air might hit this ridge and detach altogether. this might generate some downforce. good for racers, but not really what i need, especially not because it's bound to come with added dragg.
after a 10% gain from EOC this is somewhat disapointing but it was to be expected as there was no real sound theory behind the whole thing... i just pictured these little things would look cool on the roof... wich they do.
perhaps i should find a spot where i actually want to deflect the air... in front of my wheelwells perhaps?