A mono hull is a hull with a single (hence mono) planning surface, therefore a flat bottom and a v hull are both monohulls, a flat bottom just has 0 deadrise.
Great video, I am making a boat and was wondering about the hull. I was planning on a flat bottom catamaran and for my use I think it will actually be the best. I read your bad comments but in such a short video you can't go into detail. You can have a flat bottom catamaran/tri hull or countless other combinations. I think you got the basics right and although some of the critics are right in areas there generally wrong. For example "Flat Bottom Boats are the fastest" as to this comment just google the world water speed record. Another example for multi hulls is the distance between the hulls, obviously you are just going into the basics as hydrodynamics are complicated but I think for a short video you covered the basics well. Thumbs up.
Sorry, but you get a "poor" rating from me. Flat Bottom Boats are the fastest, most fuel efficient, best handling, and have the least draft, of any design. The problem with Flat Bottoms is that they are not well suited to rough water. Draft is only loosely related to the amount of water that the Hull displaces. The Hull displaces exactly as much water, by weight, as the total weight of the boat, the only time this is not 100% true is at speed, when the weight of the boat "may be" partially supported by Air Pressure trapped under the Hull, and even then, the same weight of water is actively being displaced, it's just spread-out over a much larger area, and so it would "appear" that less water is being displaced. In either case, it is the displaced water that is keeping the boat from sinking, until the boat is going fast enough to fly like an airplane, and even then, it is still displacing the same amount of water, it just does it so fast, and over such a large surface area, that the water may appear to be undisturbed. Draft is not necessarily measured to the keel, it is measured to the deepest part of the boat when it is at rest. This will likely be a rudder, a propeller, or an outboard motor, any of which may extend 12" or more below the keel. Handling...... For a non-flat bottomed design, usually, the Tri-Hull is the best handling over-all. The Cats tend to have quirky issues because they generally can't "lean-into" a turn as easily as other designs. They are almost too stable for their own good. Shallow Vee Hulls are a mixed bag of good and bad, but generally, predictable, and acceptable. but they will generally not do too well in rough water. Deep Vee Hulls are all too often wallowing pigs in the handling department, and also suck gas like a pig, but this is the most economical design that can reasonably handle rough water without hammering the passengers too badly. Serious Rough Seas....... Nothing can touch a Cat in rough seas. Some Tri-Hulls are specifically designed for rough seas, and do well, but if they are not specifically designed for rough seas, they may beat-up the passengers, in exchange for stability, fuel efficiency, and speed. Passenger comfort aside, the Tri-Hull is usually quite stable and predictable in rough seas. Shallow Vees are usually not well suited to rough seas. Deep Vees "can be" right at home in rough seas, as long as you can maintain a speed that is right in between Planing and Plowing, which will REALLY suck mass quantities of fuel, but provide a fairly comfortable ride. Speed....... Speed is always directly related to how much AIR you can trap between the Hull and the water, and therefore, how much surface area of the Hull is NOT in contact with the water, on average. Speed is also dependent upon what percentage of the Hull design is based on "Displacement", and how much of the Hull design is based on "Planing" on the surface at speed. Displacement Hulls are physically limited in speed by a set of physical dimension relationships, based on well established math formulas, and are generally, and relatively, quite slow, but they can be very power efficient at specific speed ranges. As a general rule, the less wake that is generated by a particular Hull design, (at a given speed), the more efficient the Hull design is. All of these rules will change to some degree as the Hull becomes longer, and at higher expected speeds. .
I aced the Coast Guard Power Squadron Course at 10 years old, (1967), and routinely took a 13 foot Boston Whaler 20 miles off shore. My Dad wanted to make sure I could get back into shore on my own, if something ever happened to him, so I also had to learn to read navigation charts and a compass as well.
The displacement of water by the hull would decrease as boat velocity increased. This is because as velocity increased the density characteristic of the water would increase. This can be seen easily by watching someone barefoot water ski.
@@MrTomkaeding Not being a video originator doesn't make the your poor quality claims valid! You make claims that are not true. Nothing can save that ignorance... even claims I should begin to post vid's.
Hello, I was just curious if the tri hull boat is the scb boat or a different company? Been struggling to find tri hull or even catamaran fishing boats aside from tricat and world boats.
Is that a CAB (captured Air Bubble) vessel design that uses air lubrication ?. (but is Not a hovercraft). I haven't been able to find any in the marine marketplace.
A mono hull is a hull with a single (hence mono) planning surface, therefore a flat bottom and a v hull are both monohulls, a flat bottom just has 0 deadrise.
Very good video....
Great video, I am making a boat and was wondering about the hull. I was planning on a flat bottom catamaran and for my use I think it will actually be the best. I read your bad comments but in such a short video you can't go into detail. You can have a flat bottom catamaran/tri hull or countless other combinations. I think you got the basics right and although some of the critics are right in areas there generally wrong. For example "Flat Bottom Boats are the fastest" as to this comment just google the world water speed record. Another example for multi hulls is the distance between the hulls, obviously you are just going into the basics as hydrodynamics are complicated but I think for a short video you covered the basics well. Thumbs up.
thanks for making this video
Great info
Sorry, but you get a "poor" rating from me.
Flat Bottom Boats are the fastest, most fuel efficient, best handling, and have the least draft, of any design.
The problem with Flat Bottoms is that they are not well suited to rough water.
Draft is only loosely related to the amount of water that the Hull displaces.
The Hull displaces exactly as much water, by weight, as the total weight of the boat, the only time this is
not 100% true is at speed, when the weight of the boat "may be" partially supported by Air Pressure trapped under the Hull,
and even then, the same weight of water is actively being displaced, it's just spread-out over a much larger area, and so
it would "appear" that less water is being displaced.
In either case, it is the displaced water that is keeping the boat from sinking,
until the boat is going fast enough to fly like an airplane, and even then, it is still displacing the same amount of water,
it just does it so fast, and over such a large surface area, that the water may appear to be undisturbed.
Draft is not necessarily measured to the keel, it is measured to the deepest part of the boat when it is at rest.
This will likely be a rudder, a propeller, or an outboard motor, any of which may extend 12" or more below the keel.
Handling......
For a non-flat bottomed design, usually, the Tri-Hull is the best handling over-all.
The Cats tend to have quirky issues because they generally can't "lean-into" a turn as easily as other designs.
They are almost too stable for their own good.
Shallow Vee Hulls are a mixed bag of good and bad, but generally, predictable, and acceptable.
but they will generally not do too well in rough water.
Deep Vee Hulls are all too often wallowing pigs in the handling department, and also suck gas like a pig,
but this is the most economical design that can reasonably handle rough water without
hammering the passengers too badly.
Serious Rough Seas.......
Nothing can touch a Cat in rough seas.
Some Tri-Hulls are specifically designed for rough seas, and do well, but if they are not specifically
designed for rough seas, they may beat-up the passengers, in exchange for stability, fuel efficiency, and speed.
Passenger comfort aside, the Tri-Hull is usually quite stable and predictable in rough seas.
Shallow Vees are usually not well suited to rough seas.
Deep Vees "can be" right at home in rough seas, as long as you can maintain a speed that is right in between
Planing and Plowing, which will REALLY suck mass quantities of fuel, but provide a fairly comfortable ride.
Speed.......
Speed is always directly related to how much AIR you can trap between the Hull and the water,
and therefore, how much surface area of the Hull is NOT in contact with the water, on average.
Speed is also dependent upon what percentage of the Hull design is based on "Displacement",
and how much of the Hull design is based on "Planing" on the surface at speed.
Displacement Hulls are physically limited in speed by a set of
physical dimension relationships, based on well established math formulas,
and are generally, and relatively, quite slow, but they can be very power efficient at specific speed ranges.
As a general rule, the less wake that is generated by a particular Hull design, (at a given speed),
the more efficient the Hull design is.
All of these rules will change to some degree as the Hull becomes longer, and at higher expected speeds.
.
Well said Jim.
Dam, that was long, but correct
I aced the Coast Guard Power Squadron Course at 10 years old, (1967),
and routinely took a 13 foot Boston Whaler 20 miles off shore.
My Dad wanted to make sure I could get back into shore on my own, if something ever happened to him,
so I also had to learn to read navigation charts and a compass as well.
The displacement of water by the hull would decrease as boat velocity increased. This is because as velocity increased the density characteristic of the water would increase. This can be seen easily by watching someone barefoot water ski.
What do you think about the norwegian pioner boats? For example the 15 allround or 17 flexi or the multi thats a small katamaran type hull.
Sorry but basically all your assumptions regarding why one hull is faster than the other are wrong. Source: engineer
Over generalizations based on incorrect ideas make this video largely silly. Not true, not accurate and not valid for marine hull shapes.
I guess you should do a better video.
@@MrTomkaeding Not being a video originator doesn't make the your poor quality claims valid! You make claims that are not true. Nothing can save that ignorance... even claims I should begin to post vid's.
Hello, I was just curious if the tri hull boat is the scb boat or a different company? Been struggling to find tri hull or even catamaran fishing boats aside from tricat and world boats.
That is great when it comes to speed but rough water is defferent
I've got an entrapment Hull. It's not mentioned at all.
Is that a "Sea Sled" type ? ... love them.
@@sixmagpies it's a cat hull in the front 1/2 and a monohull in the back half
Is that a CAB (captured Air Bubble) vessel design that uses air lubrication ?. (but is Not a hovercraft). I haven't been able to find any in the marine marketplace.
Sorry, i just saw your other reply, i envision that yours is more of a pickle fork design.
Good but have some mistakes
You did not show cathedral hull.
This is rubbish. Inaccurate assumptions and explanations are contradictory.
Flat bottoms plane on the water with correct engine and are quick, not monohulls ever
Enunciate.
Pronounce.
Carry the energy through to the end of the sentence.
Where did you source your disinformation? Very few facts here, as well as logic.
Use your TH-cam revenue to hire a speech therapist please.
Great comment Hector 👍👌
Agreed.
I quit at 01:11 because the spokes-model has a mouthful of marbles.