686 feet per second in knots
Conversion
686 feet per second is equivalent to 406.443887688985 knots.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 knot is equal to 0.00246036422317959 times 686 feet per second.
It can also be expressed as: 686 feet per second is equal to knots.
Approximation
An approximate numerical result would be: six hundred and eighty-six feet per second is about four hundred and six point four three knots, or alternatively, a knot is about zero times six hundred and eighty-six feet per second.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.