With this information, you can calculate the quantity of feet per second 221 knots is equal to.

¿What is the inverse calculation between 1 foot per second and 221 knots?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.0026809222 times 221 knots.

Which is the same to say that 221 knots is 373.00598 feet per second.

Two hundred twenty-one knots equals to three hundred seventy-three feet per second. *Approximation

A foot per second is zero times two hundred twenty-one knots. *Approximation