Cross wind drag and side skirts / 'tails
A few years ago, I added side skirts to my Civic.
I removed them since they add several feet of frontal area to the car when hit by a crosswind. * What kind of FE hit does a car get from increased side frontal area ? On a similar thought, what about boattails and the increase in frontal area that they produce ? * Where I live ( the 'hill country' ) , there is a lot of wind that blows in from the sides of the car. :confused: |
I wonder how crosswinds affect semis regarding FE.
I know that the semi becomes less stable, but is there also a big FE hit ? |
skirts/tails
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I can't answer the question about drag vs increased side area.I've never seen anything published on it.There is a table published by EPA on wind/mpg effects. One benefit of skirts in crosswind,is that they help cancel roll moments above the C.G.,actually increasing stability and safety to an 18-wheeler. I've only run "short" tails,so I can only address those,and my experience so far is that they offer no degradation of stability,thanks to Professor Morelli's work at Pininfarina. |
I can only imagine underside airflow at a yaw angle is extremely complex. I don't think side skirts have a negative impact on drag even in crosswinds. Remember, the flow vector is very rarely gonna be perpendicular.
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( Not sure if I deleted them. ) EDIT : I found this picture, but it has some quick and sloppy Photoshop work . The skirts and wheel gap filler are real, but the diffuser thingee etc are Photoshop additions. http://farm3.static.flickr.com/2693/...f659861234.jpg Phil : When you say that the skirts shouldn't project below the 'bottom' of your vehicle, what do you mean ? Do you mean the floorboard ?? ( surely not ) Tas : Can you simplify what you said about 'flow vectors' going perpendicular ? ( Imagine that you are trying to explain what you just said to someone with the mental capacity of a child ...... or a very smart monkey . ) |
Well, if you get a crosswind on a sailboat, and increase the sail area, it goes faster. Most of the rigid-wing sailing cars have not had a way to adjust for right or left crosswinds. I saw Mana La get hit by a gust, and the acceleration was obvious. Second Inning: Mana La Solar Car Put On Display At Peterson Automotive Museum - Green Diary YMMV
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I'll show you mine...
http://i677.photobucket.com/albums/v...0/IMG_5979.jpg |
http://http://www.bentleypublishers....ery-768-8.html
Frank Lee posted this link in response to a question I had on crosswind. http://http://207.242.75.40/derbtech/windeff.htm Here is another one that I found. Both have good explanations of crosswind vectors. |
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