A Hydrofoil boat is a boat with a lifting surface (foil) attached to the hull of a boat to lift it from the water level at high speed thus decreasing the drag and increasing the speed of the boat.
There are many different types of boats in the world. All of them share some common and uncommon characteristics. This article discusses what hydrofoil boats are, what principles they are based on, what they are used for and what their advantages and disadvantages are.
Following are some interesting facts about hydrofoil boats.
What is a Hydrofoil boat?
A hydrofoil boat or just a hydrofoil is a kind of a lifting surface that moves up the boat’s hull as the boat gain speed thus minimizing the water drag and improving the speed of the vessel. They are similar to aerofoils which are used in airplanes. Hydrofoil boats are much faster than ordinary boats and have been a great attraction in the boating industry.
The technology of a hydrofoil boat is not very popular today, but it is not even new. They were first created by A.G. Bell and Casey Baldwin in 1908 that is more than a hundred years old. They were extensively used during the first world war by American troops. They helped greatly in avoiding the waters which were trapped by mines.
How do hydrofoil boats work?
Hydrofoil boats are gaining more popularity nowadays as they are faster and speedier on the ocean water. There is a hydrofoil which is attached to the base of the boat. This hydrofoil allows the boat to move easily on the water. It also ensures that the hull of the vessel or rather the body of the boat does not come into contact with the water. Hydrofoils can only work if the boat is still on the surface of the water. Hence the body of the boat also prevents the vessel from coming out of the water and from causing a boat to sink or capsize.
Hydrofoil boats are so fast and gain acceleration so efficiently that the hydrofoils lift the body of the boat out of the water. This reduces the drag and also allows greater velocity.
A hydrofoil boat is designed in such a way that if it ever comes out of the water, its force will make the body of the boat crash back into the water and make the hydrofoil get submerged and till it generates adequate thrust for the hydrofoil to lift the boat and carry on with its operation.
Use of hydrofoil boats
Hydrofoil boats are used for several purposes. The primary use of them is in fishing. However, because of their high speeds, they can even be used for many essential purposes as well. They can be used as cargo carriers to transport goods over long distances in a short period. It does not even affect marine life much as most of the boat does not even touch the surface of the ocean, unlike large cargo ships which have large water lines.
Hydrofoil boats are advantageous because of their efficiency. The main disadvantage of fast boats is that a lot of effort is required to push them through the water. Some kinds of boats try to solve this problem. They rise up over their bow wave and skim across the surface of the water. However, even in these boats, the stern of the boat in still immersed in the water which can create significant hydrodynamic drag.
In a hydrofoil boat, the boat is entirely above the surface of the water, and the hydrodynamic drag only acts on the lines and the stern gear. The stern gear propels and steers the boat. As the boat does not touch the surface of the water, it is not affected much by the disturbances of waves. It rides smoothly on the water up to a good extent. Other than this hydrofoil boats are also quite stable and easy to handle in certain circumstances.
Hydrofoil boats are very much smaller than aircraft wings. This is because water is about eight hundred times denser than air. Hence the foils have a lot more to push against than the wings of an aircraft. Thus, they do not require the same surface area.
Hydrofoil boats were extensively deployed during the first as well as the second world war by countries like Germany, Italy and the United States of America. These boats is also used for sailing and other sports. Nowadays hydrofoil boats are also being used as passenger boats in more than 20 countries all over the world especially in parts of Asia like Japan, Hong Kong or Macau.
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Hydrofoil boat can also have many disadvantages. First of all, hydrofoil boats can easily fall off the foils as a result of contact with any small disturbances as well. It can lead to several accidents in the waters.
Even though hydrofoil boats do not take up much space, if the foils ever hit a marine animal it could be fatal for it as they have very sharp edges.
Another major disadvantage of hydrofoil boats is that they are costly to build.
Many people do not know these kinds of boats. They do not have experience in operating these and have a conservative mindset. Hence people do not usually prefer to use these kinds of boats.
These boats are very advanced when it comes to technology, and many people do not understand the science behind it. It is challenging to make propulsion systems and controls. These are also not very reliable. Even the maintenance cost for hydrofoil boats are very high.
These are the reasons why hydrofoil boats are slowly going out of use.
So in conclusion hydrofoil boats are some of the most innovative and vital parts of the marine industry but are also at the same time one of the least known types of boats. People do not know much about them and the technology that they use. It is the reason why they may refrain from using and constructing them and why they are going out of use nowadays. Still, they are very efficient and beneficial, and people should study about them and at least try and consider the advantages that they offer over using cargo ships for specific purposes.