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Think of it this way : Take a spoiler on a car and turn it upside down. Instead of increasing the size of the wake, it seems to me that the size of the wake would decrease since the air would now be channeled into a smaller area.( but with the expense of added lift )...

Thanks for the replies, as well as the link. I have read that an alternate method of decreasing the size of a cars wake would be to channel the airstream into a smaller area using air jets at the back of the car. Any clues as to how this could be done ? ( My original idea of channeling the...

A diffuser creates a wider wake ? I must be confused as to what a diffuser is. I am creating a full belly pan for the car. At the rear of the car just below thw bumper I planned to have several upright sections which will channel the air and 'pinch' it into a much tighter wake. ( Imagine a...

I am trying to reduce the wake area on a Honda Civic hatchback. ( '93 ) From what I understand, the best way to do this would be to create a full boat tail that extends out a good eight feet or so and comes to a point. Such a design would have several disadvantages such as not being able to...

You could go " Old school " and tape little pieces of yarn all over your car. Find some deserted stretch of road and have a friend drive beside you and video the car. ( Next thing you know you will see the video all over the internet and you will be forced to move to some small island...

I had read somewhere that when performing a water trough test, the model is pulled along at a very slow speed - around 4 miles per hour. If someone is testing the wake pattern on a street car that rarely exceeds 75 MPH, at what speed should a 1/5 scale model be pulled along at in the water...

Mrvortex, I found your post very informative. You mentioned the problems with coast down testing on a flat surface, and suggested using an inclined surface instead. The test you described seemed very simple - just get up to speed, slap the car into neutral, and coast while recording the time...