In anything over 12 or 15 knots of true wind the water ballast comes into play.

You'd have to be averaging over sixty knots in open water.

It may lose its efficiency in anything over 13 knots.

She'd been doing over forty knots and she didn't exactly stop on a dime.

A cast of the log half an hour ago had given just over six knots and they were able to lay the course.

He has turned toward us, speed a little over thirty knots.

Still making over twenty knots, the destroyer went into a turn.

The planes were closing at over 2,000 knots, a mile every two second.

On trials her top speed was slightly over 19 knots.

The speed, measured between identified islands, had been just over 31/2 knots.