h a l f b a k e r yIt's as much a hovercraft as a pancake is a waffle.
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The exhaust system for cars doesn't provide a simple pipe betwee the back of the engine and the back of the car. Rather, it constricts the exhaust flow in some way in order to provide some 'back pressure' to the engine. Obviously it would be a far more efficient use of the exhaust gases to provide this
constriction by using the exhaust pressure to sputter some kind of printing material (such as chalk dust) through multiple, computer-controlled nozzles onto the road surface into interesting patterns, rude words, etc.
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1. This backpressure is a side effect of an increasingly quiet exhaust. It lowers efficiency, (performance exhausts are typically loud for increased flow, not just to be annoying). The only downside to losing the backpressure is that a large enough change necessitates a re-tune of fuel map. |
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2. Blasting out chalk dust requires quite a bit of pressure, easily enough to stall the motor if trying to do this with exhaust |
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Attacking an excellent idea on the grounds of impracticality
is really not the done thing, [AMcD]. |
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The bone's mine: too complex. |
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You did say "_too_ complex"? |
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In order to get enough pressure to be useable without stalling you'd need a pump. |
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The dust would be some kind of sticky-when-hot material, I imagine, in order to adhere to the road and not just get blown off. |
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Complex and impractical? (+) Just my kind of idea. I have sketched a version of this before using troughs in the back of a truck depositing paint-filled balloons, but this would be fun. Your car would run funny and sound strange though. |
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