I can only say, that it is the biggest 21' boat you will ever have. I was fortunate enough to have a George Linder Challenger, built by Shadow, and years later a 21' built by Superboat on Long Island. The 21' Challenger is the best running 21' offshore boat you will ever run. As an Outboard it is balanced perfectly. The Challenger was built with the best material and hardware that money could buy. Fast, tough, and just awesome in the rough stuff. T2x can tell you much more. If we are lucky he will pop in on this thread.