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Clean air vs dirty air.
Driving along the freeway recently I was passed by a Toyota Hilux towing a small boat with an outboard motor attached to the transom of the boat.
The bottom of the boat was well clear of the road and the outboard propellor was spinning around fairly rapidly.
The combination went past me a pulled in ahead of me and behind another vehicle in the same lane.
After a few seconds the propellor slowed to a complete stop.
I was wondering about the effects of (aerodynamically speaking) clean air vs dirty air and the flow under vehicle being disturbed by following another car.
Peter
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