I have a homemade tunnel hull for running the marsh here in SW La. and love it. There are some varibles as others have said. For optimum performance of the tunnel, you need to vent it to break the suction from the water, which will raise the rear of the boat. This is not a boat you want to run on big lakes or rivers, it is made for shallow water.
Warren
The postings on this site by me, Marshrat, are opinion only unless specified as truth. I will not be held responsible for anyone using my opinions as an aliby to keep from getting in trouble with the law.:D