This Grumman J4F-2 Widgeon was named the "Petulant Porpoise" while serving as a test aircraft with NACA 1948.
The Widgeon was originally designed for the civil market. It is smaller but otherwise similar to Grumman's earlier G-21 Goose, and was produced from 1941 to 1955. The aircraft was used during World War II as a small patrol and utility machine by the United States Navy, US Coast Guard and by the Royal Navy.
The first prototype flew in 1940, and the first production aircraft went to the United States Navy as an anti-submarine aircraft. In total, 276 were built by Grumman, including 176 for the military. During World War II, they served with the US Navy, Coast Guard, Civil Air Patrol and Army Air Force, as well as with the British Royal Navy, who called it the Gosling, or Widgeon 1.