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Discussion in ' Boat Design ' started by bmikkalsonOct 12, Log in or Sign plane. Boat Design Net. Any one ever use a Flat bottom duck boat for a airboat Hull Discussion in ' Boat Design ' started by bmikkalsonOct 12, Hey, sone post. But have learked around alittle bit. I am thinking of using a small 14 foot flat bottom duck boat as the hull for my project. The question I have what is flat bottom duck boat plans zone to small in width for a air boat?

I plan on mounting the motor real low and use a belt drive for the bohtom. To keep the center of gravity real low.

I am more interested in jetting around the river so handling is pretty important. I am planning to keep the whole package small so it accelerates from a stand still quick. You will need generous bottom width to help offset the torque reaction of the prop.

The HD twin will botto, the boat into splinters in short order. You can get a rice burner engine for less money and enjoy a far smoother operation and probably less maintenance, less noise, less fuel. A decent cc engine will make more Hp than you can use, flat bottom duck boat plans zone or cc Yam, Kaw, Hon, Suz will blow the boat up to decidedly dangerous speeds. Sounds like a fun project if you do not make an unfortunate engine mistake.

Has any one ever used a snowmobile clutch set up? The first one was a Universal Hovercraft UHr, for which they no longer advertise plsns. That flat bottom duck boat plans zone 12'6" long, 6'2" wide. The second is a UHsp, which is 18' long and 7'6" wide. The second is pointed like a traditional boat shape, the first is relatively rectangular. That makes a difference, bottoom the center of lift moves with the shape.

That matters for boats too, but not as much I think. I think the harley motor is a really expensive proposition, and you probably won't get that much extra out of it zpne the sound, if vottom is duc, you want then great. You want a light weight prop, large diameter.

The light weight flat bottom duck boat plans zone you less torque roll, and the large diameter gives you lots of static thrust, which botrom thrust at zero boat speed.

That amounts to acceleration in practical terms. Plaans want to turn it slowly to reduce noise and prop tip erosion. My UHr used a hopped-up Rotaxwhich per book claimed 98 hp and per mods was probably somewhere between that and Prop tip speed for a hovercraft we generally try for fps or less to prevent tip erosion and flwt.

None of this helps you with the advisability of using a duck planss for an airboat hull. All I can think is that maybe you would need to reinforce the engine mounts somehow, but I don't know anything about how the hull bottom shape affects things, but your biggest thing is going to be the nose-down force from fan thrust. I imagine the airboat hulls have more depth in flat bottom duck boat plans zone nose.

Thanks, lots of good info. Ok, With any boat, there is a center of mass. If you have a cable holding the boat from the exact center of mass, then you could turn the boat at any angle, including upside down or straight up and down, and the boat will stay. There is no heavy. There is also a center of That is where the shape of the boat comes into place.

The pointed nose will displace less water than the wide rear, for example. Then you have the other forces acting on it, like botom. With a standard outboard motorboat, the prop pushes forward but the center of thrust is under the boat. So the nose tends to be pushed upward, since botto, center of mass is going to try to stay put, and the motor is trying to spin it around and flip over backward.

With a hovercraft or airboat, it's opposite. The center of thrust the shaft of the prop, in both cases is now pushing from above the mass, so the force of thrust tends to drive the nose downward.

I suspect that one of the designers will get on and say that airboats have booat higher side near the front than a normal boat, Simple Flat Bottom Plywood Boat Plans List to counteract that nose-down force. Aone the planss for CSI Miami Edit: Never mind From the looks I would say about ft and 6. The front is similar to a Jon boat with that thing sitting on top I notice lots of sealed tankage for buoyancy and general walking about on. HMMM, it appears to me that making my own hull goat not be the way to go.

I do not really feel like doing the hull 5 times. There is lots of science to this flat bottom duck boat plans zone I really don't want to solve. There are a lot of airboaters here in Florida. Flat bottom duck boat plans zone are considered by the general public as the lowest form of life.

Actually I think some of them are pretty good people. They are, out of necessity, a bit clannish. The biggest problem Duck Flat Boat Plans Growth of airboaters vs public is noise. Most flat bottom duck boat plans zone the airboats use hottom engines such as Continentals. The extreme guys use big inch V8 engines, some of which make HP.

There is even some state legislation that requires the airboat engine to have mufflers. Engines are not flat bottom duck boat plans zone problem, props are. They make one hell of a noise when turned zome. Go out to the local airport and listen to some Cessnas or Mooneys and the like. Make that kind of noise on the local lake or river and you get some unhappy, unsympathetic, residents. So much for social commentary.

You can compensate for the force vector that induces bow down attitude. Simply angle the thrust line slightly up. About the boats; Most of them are FRP, a few aluminum. The current crop of them have spoon shaped bows, they are usually Many of them are surprisingly short, as in 12 feet Flat bottom duck boat plans zone. The ones with the Continentals simply mount the engine and prop at some bottoom that allows the prop to ducck the transom by a foot or so.

Red neck engineering can be observed on some of these boats but a lot of them are very flat bottom duck boat plans zone and thoughtfully. You might be able to Google up some specs about these boats. One of the brand names is Gilileo, another brand is Combee I think. I believe that there is an airboaters association here in Florida.

If you can contact them they will be able to give you information and encouragement. You must log in or sign up to reply. Show Ignored Content. Similar Threads. Squidly-DiddlyMar 24,in forum: Boat Design. Replies: 35 Views: 1, Squidly-DiddlyDec 16,in forum: Boat Design.

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