With this information, you can calculate the quantity of feet per second 669 knots is equal to.

¿What is the inverse calculation between 1 foot per second and 669 knots?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.00088562601 times 669 knots.

Which is the same to say that 669 knots is 1129.1448 feet per second.

Six hundred sixty-nine knots equals to one thousand one hundred twenty-nine feet per second. *Approximation

A foot per second is zero times six hundred sixty-nine knots. *Approximation