Tunnel hull
From Wikipedia, the free encyclopedia
A Tunnel Hull is a type of boat hull that uses two typically planing hulls with a solid center that traps air. This entrapment then creates aerodynamic lift in addition to the planing lift from the hulls. Many times this is attributed to ground effect. While modern testing has shown that ground effect in aviation is not a matter of air trapped between the wing and the ground, but rather a result reduced drag created by the lift of the wings, this evidence is inconclusive as applied to the marine environment.
Tunnel hulls are distinguishable from other catamarans by the typical close hull spacing and solid deck in between the hulls.
