What are the Pros and Cons associated with a Jet Tunnel?
Lets talk about the Cons first. There are two types of Tunnel Hulls, those for a prop drive and those for a jet drive. If the tunnel was not designed for a jet, the outcome is not favorable. The will cause increased drag, reduce planning surface and in many cases will not perform even as well as a standard non-tunnel hull. Prop tunnels are larger and deeper than jet tunnels. The pictures below show a prop tunnel on the left and a jet tunnel on the right. Note the overall size difference of the two tunnels. The purpose of the jet tunnel is to lift the jet intake by 2-3 inches to where the heel of the intake foot is equal to or slightly higher than the bottom of the boat. This not only provides additional protection to the intake, it also allows the craft to operate in as shallow water as possible. The tunnel should not be much longer than about 18 inches and just wide enough to allow for a full range of motion when turning the outboard to the left and to the right. By extending the tunn
