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General Jet Boat Discussions
Any experience running fast shallow Appalachian mountain rivers...
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<blockquote data-quote="Vol423" data-source="post: 500033" data-attributes="member: 6621"><p>I am a licensed boat manufacturer in East Tennessee. I sell almost exclusively outboard jet boats. I don't build them but have them built for me. Any major river in this region will see jet boat usage. The Clinch, Holston, Nolichukey, French broad and Tennessee rivers in Tennessee and larger rivers in Virginia and NC will have jets. In general, you need about 12" of water to take off and a good boat will run in 3-4". Most of my boats have .100 to .250" thick bottoms with no UHMWPE.They have a tunnel that keeps the jet outdrive above the boat bottom to avoid damage to the outdrive. If you aren't seeing jets where you are it's most likely there isn't sufficient deep water for takeoff and too many rocks. Check out River Road boats in Lynchburg, VA for examples of boats with UHMWPE clad bottoms. They use 175 HP outboard jets to push 15 foot boats. Jet drives take away 1/3 of the horsepower of an outboard, so a 90 HP motor delivers 65 HP at the jet drive. It's hard to get much over 30 MPH out of a jet boat, even with outsized motors. In general, a flat bottomed isn't best for a jet drive. You need a slight V shape of 5-6 degrees to shed entrained air away from the jet intake. Also never build rocker like a drift boat bottom into a jet hull. That will make a boat porpoise in the extreme. Transom angles should be at least 20 degrees as porpoising in jet boats is common. I suggest buying a used jet boat and learn from it first before trying to build one. I have seen many amateur abominations just that didn't work.</p></blockquote><p></p>
[QUOTE="Vol423, post: 500033, member: 6621"] I am a licensed boat manufacturer in East Tennessee. I sell almost exclusively outboard jet boats. I don't build them but have them built for me. Any major river in this region will see jet boat usage. The Clinch, Holston, Nolichukey, French broad and Tennessee rivers in Tennessee and larger rivers in Virginia and NC will have jets. In general, you need about 12" of water to take off and a good boat will run in 3-4". Most of my boats have .100 to .250" thick bottoms with no UHMWPE.They have a tunnel that keeps the jet outdrive above the boat bottom to avoid damage to the outdrive. If you aren't seeing jets where you are it's most likely there isn't sufficient deep water for takeoff and too many rocks. Check out River Road boats in Lynchburg, VA for examples of boats with UHMWPE clad bottoms. They use 175 HP outboard jets to push 15 foot boats. Jet drives take away 1/3 of the horsepower of an outboard, so a 90 HP motor delivers 65 HP at the jet drive. It's hard to get much over 30 MPH out of a jet boat, even with outsized motors. In general, a flat bottomed isn't best for a jet drive. You need a slight V shape of 5-6 degrees to shed entrained air away from the jet intake. Also never build rocker like a drift boat bottom into a jet hull. That will make a boat porpoise in the extreme. Transom angles should be at least 20 degrees as porpoising in jet boats is common. I suggest buying a used jet boat and learn from it first before trying to build one. I have seen many amateur abominations just that didn't work. [/QUOTE]
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