Quote:
Originally Posted by JMV
Pisces :
Why 17 knots precisely ? Thanks for your answer anyway.
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Well, not precisely. The conversion factor from meters/second to knots is 3600s/1852m= 1.944 . As I suggested we take the easy conversion factor of 2 (just doubling it). Then, if the real speed is 17 knots we somehow measure is as being 8.75 m/s (the real speed is 8.7456 m/s), we overestimate it as 2*8.75 m/s= 17.5
Since most civilian traffic is much slower than that, doubling the m/s value is easy yet accurate enough. It's allways off by less than 3% of the real speed.