Atkin’s River Belle is the largest of his tunnel hull designs available in plan form to the amateur builder. Its a nice looking River Cruiser type craft, 35′ 3″ x 8′ 10″. A shallow draft boat (17″) its has the classic styling of the turn of the previous century.
Atkin’s tunnel hull is an offshoot of the Seabright Skiff designs, with the addition of a negative deadrise at the stern, forming a “triangular” tunnel around the prop. Some people don’t seem to think that would work well, but most of the ones built seem to show very good performance.
There is concern about “slap” in a rolling motion as the sides of the tunnel come out of the water and go back in, but…
A similar look as Mark Van Abbema’s V39, although with a different hull form.