Full speed for a chaser was rated at around 18 knots, but by most CO's accounts, the actual full speed attainable was around 14 knots.
For long trips, the center engine was shut off and the propeller shaft de-coupled, to save on fuel.
Photograph of a chaser at full speed. Collection of Ralph Edwin Long, radio electrician on SC 299, courtesy of his nephew, Robert DeBow. Thanks to Russ Lloyd for submitting the photo scan.