I know many trad owners are positive about the deflectores but I could not detect any improvement. I made several different versions with the intention to determine the best size and shape and possibly improve on the original. I made them such that I could install and remove them while driving and tested at various angles and different speeds. I could not detect any improvement and left them off. AFAICT the deflectors didnt work because the are in a turbulant area. The airflow is trhown off the side of the windscreen outside the area where the deflectors are. I suspect to make them work they would have to be further forward in the flow, and curved to direct the flow inward like the deflectors you see on the edge of truck cabines. Similarly a curved strip (spoiler)along the top of the windscreen (starting just in front) would probably make a big difference. I think Merc uses that on the new cabrio's I would like to investigate further with telltales or even a windtunnel but I am afraid the result would not be in style with the trad. I also made a mesh type screen beind the headrest and it does quite a good job reducing the turbulence and tailwind in the neck, but again I didn't like the "Audi" looks of it. So I am happy driving without wind deflectors or side screens. On long runs I use "period" headgear that covers the ears and turn the collar of my jacket up, Lovely
Cheers J
