The Cobra's was Chris Craft's attempt to update the racing runabout concept with mid-50s styling, including the famous Tail Fins. The 21' Cobra came with either an M-series engine or V-8 Cadillac engine. The Cadillac powered 21' Cobras was Chris Craft's first post-war attempt at true high performance runabouts, with top speeds easily exceeding 50 mph. Also, the fiber glass fins were considered labor-intensive so the Cobras were never intended for large-scale production and were only produced during the 1955 model year.