The propeller blades require more area to deal with the aerated water. This durable, thoughtfully designed jon boat offers a weight-forward center console to keep the draft as shallow as possible, and a high-performance jet tunnel engine configuration that protects your engine from damage. Better yet is a prop with long, swept blades, often called long-eared props. If I remember right you gain about 3″s in motor height running a tunnel hull with a prop tunnel. The trick to tunnel-hull jon boats is in the propeller. I have a jet that I've run. There are both tunnel hulls for prop motors and jet motors. The trick to tunnel hulls is in the propeller. I currently have a 13ft Aksano power cat. I mostly use the boat to cruise and fish but sooner or later will try some watersports. Still can't find a good solution or set up. This is why a typical four-blade propeller make a better tunnel prop than a typical three-blade prop. Which has led me to a few makers who offer prop tunnels. The prop tunnel is the deeper of the 2. Air entrapment hulls (catamarans and tunnel hulls) pack air and lift during forward motion; they typically use props with 15 to 18 degree rake — since air pressure does most of the lifting. Boat and motor weigh 780 lbs. A True 20 Despite the effort to standardize transom height and motor length, there has been some “creep” by both boat and engine builders over the years. This explains why the typical 4 blade propeller makes a better tunnel propeller than a 3 blade propeller. Cant remember the name of the company that makes both tunnel hulls. Switching from a small-diameter prop like a 13.5-inch Mercury Laser II to a 14.5-inch Mercury Enertia effectively lowers the swing of the prop blades by a half-inch. it is a tunnel hull and 70 inches at the beam. Tunnel hull Jon boat design. In order to use a boat in shallow water the boat must have a shallow draft and preferably a flat bottom.. Jon boats are shallow draft, flat bottom boats that are made for a myriad of inland shallow waterway tasks, from utility work to fishing and hunting. This propeller will perform well in extreme motor elevations, as well as on flat boats and tunnel-hull applications. Even better is a prop with a LOT of cupping. The extra-thick blade sections will add durability against scratches and dings. The ability to traverse shallow waters isn’t a feature that all boats possess. If your angling passion takes you to the narrowest, rockiest shallows, you need the Lowe Roughneck 1860 Tunnel Jet. Its powered by a 50 hp etec with a gear ratio of 2.67 and rpm range of 5500-6000. I need some honest opinions here guys. I've stumbled onto both SeaArk and Weld Craft who offer tunnel hulls for props. The Pro Finish 5-blade CNC cleaver propeller. The propeller blades need a lot of area to deal with the aerated water. This only leaves the skeg below the hull and puts the motor up into the tunnel whereas on a standard hull the anti vent plate is about even with the hull and the prop shaft is 3" below the hull The transom is standard 15", so is the tunnel simply meant to allow more water for the prop so you get on plane easier in shallow water? I am going to be shopping for a new boat within the next year or so, and I am really torn between getting an outboard jet, or getting a tunnel hull with a prop motor. It’s expected that more pitch will equate to higher speed, since pitch is the nominal distance the propeller moves through the water for each revolution. The initial attempt to get to the X left me with a clogged jet on the river and towing a boat through silty, weedy bottoms. The 18-inch-pitch Enertia propeller delivered the best top speed and the worst hole shot. 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