Conversion in the opposite direction
The inverse of the conversion factor is that 1 foot per second is equal to 0.00138430794695303 times 428 knots.
It can also be expressed as: 428 knots is equal to feet per second.
An approximate numerical result would be: four hundred and twenty-eight knots is about seven hundred and twenty-two point three seven feet per second, or alternatively, a foot per second is about zero times four hundred and twenty-eight knots.
 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.