With this information, you can calculate the quantity of feet per minute 81 knots is equal to.

¿What is the inverse calculation between 1 foot per minute and 81 knots?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per minute is 0.00012191025 times 81 knots.

Which is the same to say that 81 knots is 8202.7559 feet per minute.

Eighty-one knots equals to eight thousand two hundred two feet per minute. *Approximation

A foot per minute is zero times eighty-one knots. *Approximation