Âé¶¹´«Ã½

The last word

10 July 1999

Tow trucks

Question: When racing cars, motorbikes or bicycles “slipstream”—follow
closely behind each other on a racing track—there is undoubtedly a benefit
for the trailing competitor of reduced wind resistance and the pull of the
vacuum created by the vehicle in front making a hole in the air.

However, I’d like to know if there is a corresponding cost to the leading
vehicle in having a competitor following closely behind.

Cars in a drag

Question: My car is small and so slow that even trucks and buses outpace me
on the local highway.

When such a vehicle approaches…

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