Speed-to-length ratio = V/√L
Where V is velocity in knots, and L is vessel length in feet.
So, let’s use an example that applies to us swimmers and see how length affects speed.
Given: speed-to-length ratio = 1 (this is a typical value for a proper running hull, and one that also makes sense if the hull in question is your body)
Now, let’s take two swimmers, one 5' tall and one 6' tall, and see how they compare in the formula:
1 = V/√5, V = 2.23 knots
1 = V/√6, V = 2.44 knots
You can see clearly that as length increases so does velocity.
|The shorter vessel sits in the trough created by the longer one, with the bow wave clearly providing an uphill bulge that must be overcome.|