a question for the aero guys!
 

I.ve been thinking about it for days now. Afther reading a bit into mirror designs and the high preasure at the windshield and high turbulance around the a pillar.

What about spoilers/flaps to fill in the angle between fender and a pillar. A flat plate welded in or if ducktape wil hold for testing or other manners. But i my mind if you box in the high preasure at the base of the windshield and "cut" the air with the same plate for better attached flow on the sides and around the mirrors. Sorry for my schetchy explanation. I.ll try to make a hand drawn schetch and upload it

Here i a quick sketch (sorry for the childish car haha) and the spoiler/flap is filled in. Also i think a car with a bigger transsition from bonnet to windshield would proffit more frome this.

Hope you guys know something about it. Or ill try it when weather gets better and make a coroplast mockup for it and do a a-b-a-b with tufting.

A windshield wiper cover like?

Or like a hood cowl?

Not like that. More like wing end plates on big spoilers. The would trap the high preasure and let it move over the windshield as not to let it spill it around the A pillar. Thus redusing drag around the a pillar.

Ok it would be some trail and error to find the correct shape and size for each car.

I.ve made a simple top and front views to. Also the plates are highlighted.

better make it out of clear Perspex you will have a big blindspot there

Seems like a good idea at first blush, but it would make things worse. The airflow at the base of the A pillar isn't traveling straight back in a way that could be meaningfully 'corraled' like that- it's going across at a good angle. So that plate would cause separation & recirculation behind it, and that would make a mess of the flow along the side of the car.

I think i know what you mean. But would it also be so if it is gap sealed. With no leaks from the high preasure part?

I think if it is sized and curved properly it could work.

Better than a flat plate, sure.

Good luck fine tuning it outside of CFD or a wind tunnel!

It would take alot of trail and error. To make it big enough to not let it spill the high preasure and to make it flow nice