The first real consideration of making floatplane fighters out of the Spitfire and Hurricane came during the 1940 Norwegian Campaign, and work began on both aircraft at that time. At the end of the campaign, development ended, and the Hurricane project was stopped. Known as the “Narvik Nightmare”, the Spitfire project languished until just before Pearl Harbor, when work was reinstated, this time with the Mk. Vb airframe. This time, instead of Blackburn Roc floats, specially designed Supermarine floats were used, along with additions to the vertical fin to offset the aerodynamic effects of the floats. The result was a highly successful conversion, with excellent flying and water handling characteristics. In fact, it turned out to be the fastest floatplane fighter of World War II.