Until the late 1960s, the threshold was 32 to 38 miles per hour (or 28 to 33 knots).

He said his crew can live with anything up to 18 knots.

In theory such a ship can go very fast, perhaps up to 50 knots.

He cut his speed to ten knots, then to five, and finally to three.

It could travel at a speed up to 11 knots.

The speed was down to less than a hundred knots.

Then we settle down to six knots and continue the mission.

Speed was cut to five knots, which took several minutes.

The wind by then was back up to about 11 knots.

We are testing equipment that can move at up to three knots.