Rear vacuum (a non-technical term, but very descriptive) is caused by the "hole"
left in the air as the car passes through it. To visualize this, imagine a bus driving down a
road. The blocky shape of the bus punches a big hole in the air, with the air rushing around
the body, as mentioned above. At speeds above a crawl, the space directly behind the bus is
"empty" or like a vacuum. This empty area is a result of the air molecules not being able to
fill the hole as quickly as the bus can make it. The air molecules attempt to fill in to this
area, but the bus is always one step ahead, and as a result, a continuous vacuum sucks in the
opposite direction of the bus. This inability to fill the hole left by the bus is technically
called Flow detachment .At the rear of vehicles, the ideal format is a long and gradual
slope. As this is not practical, it has been found that „raising and/or lengthening the boot
generally reduces the drag
Rear vacuum (a non-technical term, but very descriptive) is caused by the "hole"left in the air as the car passes through it. To visualize this, imagine a bus driving down aroad. The blocky shape of the bus punches a big hole in the air, with the air rushing aroundthe body, as mentioned above. At speeds above a crawl, the space directly behind the bus is"empty" or like a vacuum. This empty area is a result of the air molecules not being able tofill the hole as quickly as the bus can make it. The air molecules attempt to fill in to thisarea, but the bus is always one step ahead, and as a result, a continuous vacuum sucks in theopposite direction of the bus. This inability to fill the hole left by the bus is technicallycalled Flow detachment .At the rear of vehicles, the ideal format is a long and gradualslope. As this is not practical, it has been found that „raising and/or lengthening the bootgenerally reduces the drag
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