I"m guessing you mean the ship in "Master and Commander"?
There are some shots here:
<a href="http://www.swordplaystudios.com/film/farside.html" target="_blank">http://www.swordplaystudios.com/film/farside.html</a>
And here's some info I found on a M&C fansite:
<!--quoteo--><div class='quotetop'>QUOTE</div><div class='quotemain'><!--quotec--><b>Acheron</b>
The `American-built`, heavy French `privateer-frigate` Acheron of the movie is an entirely fictional ship, that makes no appearance in O’Brian’s books. In ‘character’ terms, she’s something of an amalgam of the Spanish privateer Cacafuego that Jack captures at the end of Master and Commander (based on the very real El Gamo taken against all odds by Lord Cochrane) and the USS Norfolk that he chases in The Far Side of the World (loosely based on the real USS Essex, captured in 1814 by HMS Phoebe). The sheer relentlessness of her pursuit of the Surprise seems drawn from the behavior of Waakzaamheid, the Dutch `74-gun` that tracks Jack’s HMS Leopard across the South Atlantic in Desolation Island (a point made by Don Seltzer of the Gunroom).
Curiously, the only Acheron (the name of an underworld river in Greek mythology) in naval service in 1805 - when Peter Weir sets his movie - was actually a Royal Navy ship, an `8-gun` `bomb-vessel` of 388 tons, launched in 1799 and bought into the Navy in 1803. The French `40-gun` frigate Hortense took and burned her off Malta in early 1805. Remarkably, her taking could have made a splendid O’Brian story, for she and her little `consort-sloop` HMS Arrow took on two large French frigates (Hortense and the `38-gun` Incorruptible) in an evening and morning running fight: the overwhelming odds eventually forced both British ships to surrender. Acheron’s Commander Arthur Farquar was soon promoted full Captain for his bravery, as was Arrow’s Commander Richard Vincent.<!--QuoteEnd--></div><!--QuoteEEnd-->
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