Interesting.

Let's see . . . each revolution of the reel will put out a length of line equal to approximately 3.14 times the diameter of the reel (with line).

Because there are 12 inches in a foot, 5280 feet in a mile, and 60 minutes in an hour, the conversion of RPM to miles per hour (line speed) is about:

RPM x D x 0.003

where D is the reel diameter in inches. For 16,000 RPM, then, it appears that the line leaving the reel at a rate of nearly 200 miles per hour if the reel diameter is 4 inches.

Can permit swim 200 miles per hour?

Of course, I could have made a mistake in the math.