exterior sunvisors
 

has there been any discussion or testing about the advantages to having sunvisor on big rigs, or flater windshield trucks, do you think there is an aerodynamic advantage, I have been working on one for my Kurbmaster thinking that I can gain something but wonder if they act more like a scoop then air deflector? Anyone have any ideas, would load a picture but have not been able to sort out how, they are all too big for some reason even after resizing.

Seriously?

dead serious
 

I got a mock up done but still can't figure out how to get the pictures have uploaded to photobucket but not sure how to get them here,

I suppose it might be possible to design one that improves the flow at what would be the windshield/roof junction like Dr. Paul Macready's patented leading edge device purportedly does, but I've never seen one like that. They appear to usually be quite aero awful, especially the "vented" ones.

by vented do you mean with a gap between the visor and the roof, I was thinking after seeing them like that on most trucks that I would have to do that as well to allow the air out so it would not blow off, If attached directly to the roof as in my mock up( wish I could figure out the pictures would save 1000 words) I was worried that I would be trapping air and even though it is a steep angle the air would run up the windshield and stop putting a lot of pressure on the visor acting like a scoop eliminating the possible advantages of the deflector

yes

http://http://i1066.photobucket.com/...ght579x362.jpgsee if this photo works, if it does this is my mock up was intending to leave a gap between the roof and he visor

http://http://i1066.photobucket.com/...ght579x362.jpghttp://http://i1066.photobucket.com/...ght579x362.jpgtry this

I can't seem to get the photo up will try again tomorow

You had "http" in there twice. Try this one:

http://i1066.photobucket.com/albums/...ght579x362.jpg


To embed it, you use the img tag inside square brackets: []. Then the URL for the image file, then /img in square brackets. The result is:

http://i1066.photobucket.com/albums/...ght579x362.jpg

-soD