Tunnel Hull cavitation questions | Boating Forum - iboats Boating Forums
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You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Tunnel Hulls? Thread Rc Tunnel Hull Boat Plans List starter fishndirk Start date May 13, Joined Jun 2, Messages Anyone with experience with tunnel hulls?

I know the concept is to raise the prop higher up in the water, thus allowing a shallower draft and better back woods running. Does anyone have experience weather this takes away from top end performance or performance in high speed turns?

What are the pro's and cons? Joined Aug 11, Messages Re: Tunnel Hulls? A true tunnel would give you better preformance,theres nothing to disturb the water from the prop.

On them smaller tunnels,you will lose some top end mph and if not set up right it will cavitate in turns but that can be said with regular hulls as well. From what I've read it has something to do with the disturbed water flow to the prop. Some people say it tunnel sucks the boat down,it can be helped a bit by venting. Joined Nov 3, Messages 1, You will have to be more specfic as to tunnel hull. The ventilation plate on any hull should be about flush with hulls bottom so whatever concept your talking about is incorrect in most applications,[ racing is a whole new ballgame.

They turn extremely well and are a faster hull due to less wetted surface. They are a little more fuel efficient and do draw less water The cons are they do not cut the water as well as a deep v in heavy seas. Unless there is a "step pad" in the middle you probably should run two engines if outboard driven. Check Mfgs' recommendations on that specfic issue.

What is the make and model boat you are talking about? Joined Oct 22, Messages Tunnel Hull Boat Plans Free Time 2, The only "tunnel hulls" I'm familiar with are meant to go fast, the aerodynamic design of the boat lifts the entire hull until there is very little boat still making contact with the water, resulting in reduced drag and higher speeds. And it takes a good bit of speed before these hulls really start to work.

I'm suspecting you're talking about something else entirely though, so I'm hoping to learn something from this thread. The ventilation plate on any hull should be about flush with hulls bottom so whatever concept your talking about is incorrect in most applications.

Joined Mar 19, Messages 3, When you run your prop at that setting you will need to get a lower unit that has a water pick up in the bullet or make some other arrangements for sea water pick up.

Yeah the one im refering to in specific is the G3 mod v tunnel hull boats. Or any type like that. The hull has extended step plates off the back with a cut out in the middle back of the boat.

Seems to me like the step extensions would add to plaining but the short tunnel cutout would decrease performance while manuvering.

Just cureous if anyone has had experience with these Bamaman1 Lieutenant Commander. Joined May 15, Messages 1, I have tunnel hull pleasure boat experience dating back to Most real tunnels you currently see are not pleasure boats--they're fly weight racing boats. One of my buddies had a tunnel hull with two Merc factory blueprint motors. In those days, the fastest boats were Allison Craft 17's, which were running the low 70's. This was prior to the Merc Black Max motors. The pros are floating on a blanket of air with maybe 1' of the boat in the water.

When you trim the motor down and go into a turn, you feel like you're going to be slung over the side--high g's. You might be running side by side with a V bottom boat and go out into the big lake full of white caps. You'll actually increase speed maybe 5 mph in big waves--leaving the V bottom boats being pounded by the waves while you don't even feel the waves. Fuel mileage is absolutely incredible with such efficiency.

The cons are that 18' tunnel hulls must be relatively light--maybe pounds for a pleasure boat. They're also not good with heavy passenger loads. At those speeds, a good gust of wind would cause you to go airborne.

There again, any boat running over 75 mph can instantaneously go past the point of no control. I can tell you I'd like to have an outboard tunnel hull with a hp motor. As long as you didn't go too fast on a gusty day, they'd give you a thrill like you've never experienced. Thanks, but im just thinking I do a lot of fishing, my main thing river and backwater but I also duck hunt.

I want a boat that can handle 4 to 5 people and harldy loose any pefrormance. Not really into racing, I just dont want the boat to cavitate the hell out of itsefll when im comming around a turn all fast.

Tunnel hulls don't cavitatea when you go into a corner, as you've got the power trim and hopefully a hydraulic jack plate to tailor the motor height. If you're wanting to duck hunt, you need an aluminum jon boat with the widest transom you can find. Fiberglass boats are not for backwater use, as they scratch easily.

Sounds as if you need two boats if you want to carry people. Where is the waterpickup on your motor vs the standard recreational boaters? You even say" don't try this without a water pressure gauge" Not quite what the average boater worrys about. Yes you could throw a jackplate on it with a low water pickup and have the prop catching air,again not what the OP is looking for,he wants it for fishing,unlike your setup. I do own a few boats,6, and among them is a Power Cat 15T [three sponsons] and a Custom Craft Manta Ray with a 5 pt bottom,not oblivious to the go fast crowd.

That's definitely not true for all boats. My Checkmate runs very nicely with the centerline of the prop only 2. Most posts here aren't talking about the boat your looking at. In a jon boat like that,there are 2 types of small tunnels;1 for props and 1 for jets. The prop one will be alittle deeper approx 8" then the jet one approx 3". Your going to lose some top end, mph,like said earlier won't cavitate any more then a regular jon if set up right.

The votes still out on a jack plate,some like it,others raise there transom to fit the bill. If it's factory won't have to worry about modding.

The stern wouldn't squat as much when taking off,with those pods I'm thinking a reg. I run a CV,mod V;jet tunnel. I run a prop on the jet tunnel now,allows me to raise the prop abit higher.

I can still hit the prop though,with a prop tunnel it would be better. Joined Nov 13, Messages 4, There are a couple of midwest companies that make vented tunnel style boats. Most are in a traditional flats boat configuration. It's a tricky hull combination to get right but can be great boats.

Thanks to all for the posts. Thanks to pootnic, thats pretty much the info i was looking for. If I do go with that type of hull I will definately leave it as the stock set up since I dont have any experience with that type of hull.

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