The predominant winds of southern Sardinia are the mistral (north-west wind), the scirocco (south-east wind) and, in some locations, the thermal winds (which, in most cases, blow from the south * east ). Here in the south the winds are not very gusty and the temperatures of the water and above all of the air are higher than in Northern Sardinia.
Southern Sardinia, in the past little frequented and considered by lovers of sailing sports, has had a boom in attendance in recent years: fantastic places, almost always present wind and excellent connections from Italy and most of the European capitals thanks especially at the airport and port of Cagliari. The kitesurfing beaches in the south of Sardinia are more varied and less frequented than those in the North of the island and moving between the south-east coast, the south coast, and the south- west coast, the probability of finding, every day, wind suitable for the practice of kite surfing is very high.
Here underthe beaches equipped for Kitesurfing & Windsurfing and the others where you will be forced to have your own equipment or maybe for rent.
Regarding the rental of equipment the costs vary and depend mainly on the manager and on-site use or at other beaches.
The more radicals prefer Oristano and its surroundings, because if the frequent mistral wind in Capo Mannu rages, you can jump the biggest waves of the Mediterranean (3-5 meters) with the wind perfectly at the side, or to be a little more comfortable logistically
Foil is a technology that allows a hull (propelled by a motor or in this case a sail) to emerge totally from the water, thanks to the hydrodynamic action of the submerged surface.
In fact, the pressure of the water under the wings, combined with the depression that forms above them, generates a force of lift opposed to the weight, and allows a great reduction of resistance to motion and consequently an increase in efficiency.
The curve in figure shows qualitatively the rapid reduction of the resistance, once, reached a certain speed, the hull comes out of the water.
Kitefoil is composed of the following elements:
Fuselage: It extends in length in the direction of motion and transmits the sustaining force to the hull through the mast, to which it is connected;
Mast or Keel: It transmits the sustaining force to the hull, connecting it to the fuselage and to the immersed surfaces that create the lift;
Supporting and stabilizing wings: These are the surfaces that create lift. The first is able to give all the lift required to separate the hull from the surface of the water, while the second balances the moment provided by the first, with a consequent stabilization effects.
History of the hydrofoil
Hydrofoils have been used in different types of boats for over 100 years.
The first person that designed and built an hydrofoil was an Italian named Enrico Forlanini, in 1906. For his hydrofoil Forlanini used a system of 4 groups of parallel wings (a pair in the bow and a pair in the stert) of decreasing width, unlike the single hydrofoil wings in use today.
Forlanini’s design was resumed and improved by various other inventors over the following decades (in particular Alexander Graham Bell and Casey Baldwin), until around the 50’s the world began to invest massivelyin boats using hydrofoil fins, for both military and commercial use. The boom was reached in the 60 ‘s- 70’s but since then their use in motor boats has gradually decreased, due to various problems; not only due to construction and maintenance costs, but also safety and environmental issues. Materials for hydrofoils were in fact metallic, the same used for the structure of the boat.
The same problems occurred for hydrofoils used in the sailing or hobby disciplines, that began in the 60s, but was soon abandoned.
Since the turn of the century investments in this technology have resumed. Mainly because new composite materials made it possible to produce extremely light and resistant appendages, different hydrofoil researches began again, in order to identify the best shape and structure for every hull and wind.
A wide interest in hydrofoil sailing technologyspread trough the media thanks to its use in the 2010 America’s Cup. Some sectors in which the foil has developed, however, are only now becoming popular. Unfortunately research has already reached a moment of stationarity, because the significant risks involved in the sector do not attract investors’ interest.
Hydrofoil in kitesurfing
The application of hydrofoil to kitesurfing dates back to the 2000s. The design of modern hydrofoil for kitesurfing varies in geometry based on its type of use. The main categories are:
Kitefoils for beginners are designed to be stable at low speeds.
Those for freestyle instead are more suitable for performing acrobatics and jumps and therefore have greater maneuverability, in addition to being structurally more resistant, in order to be able to withstand impacts on landing jumps.
Racing kitefoils are designed to reach the highest possible speeds with the greatest stability for all the different wind conditions. To do this, the latter have a minimal design and are made of carbon fiber, to be as light and resistant as possible.
Hydrofoil for kitesurfing (also called kitefoil) is a combination of various components, each with a very precise function . Although it is easy to design a single fin suitable to a certain sea condition, it is far more complicated to create a kitefoil that is best suited to a wide range of wind conditions, and therefore to a larger speed range.
To best explain the operation of the components of a hydrofoil fin, it is important initially to understand the most important moments to which the board is subjected: roll, pitch and yaw.
Pitch Yaw and Roll in a Hydrofoil
To understand how kitesurf works we can consider just the first 2, roll and pitch. Yaw can be ignored because load conditions are approximately simmetric and the mast twist can therefore be denied.
Kitefoils must produce enough lift to rise out of the water, giving support to the kitesurfer, and at the same time produce a moment of such magnitude as to allow balancing. The lift created must be sufficient in a wide range of speeds from the starting speed (“take off” speed) to the maximum speed (“top” speed).
The take-off speed is the speed at which lift begins to be such as to allow the kitesurfer and the board to separate from the water. As resistance decreases, due to the fact that the board is now no longer in contact with water, but in the air (which density is about 1000 times lower than that of water), there is an increase in speed; this increase in speed corresponds to an increase in lift for the main foil, and a change in lift capacity of the stabilizer, which may vary depending on the type used, as will be discussed below.
There are two different functioning systems of the stabilizer, which can have a positive bearing capacity and a negative bearing capacity.
In the case of the positive flow stabilizer, in order to balance the moment of force Fp (Force weight of the kiter minus the force exerted by the kite) must have a arm smaller than the second case and therefore the kiter must have a greater ability to stay in equilibrium. The balance of the moment becomes evident in the behavior of each kitesurfer who uses kitefoils, which centers the back foot on the mast and uses the front foot to apply a force that balances the moment. In simplified terms, the board represents a lever on which the rider applies a force, while he balances the strength of the stabilizer with his front foot, counteracting the moment generated by load-bearing and resistant forces.
The stabilizer moment and the rider’s need to counterbalance it, leads to a more stable equilibrium, and the rider’s ability lies in maintaining the balance in situations of variable winds and during maneuvers such astacks or jibes.
Contrary to its name negative flow stabilizer improves stability because the proportion of the fin / lift ratio is reduced and therefore its efficiency decreases. The task of the kitefoil designer is to create a geometry that allows at the same time both:
A sufficient bearing capacity in a wide range of windy conditions;
Produce a stabilizing moment sufficient to allow the achievement of equilibrium.
So, ultimately it is required to maximize Lift / Resistance ratio without unduly compromising stability. The design of a kitefoil is subject to a number of constraints that must be considered in the optimization phase. If one wants to design a kitefoil for racing, he should consider the rules imposed by the IKA (International Kitefoil Association) which specifies that the maximum length of a kitefoil, (measured perpendicularly to the board) cannot exceed 5000 mm (in the current state of the art foils are about 1.2m long, that is far from 5 m). Furthermore, the appendices can be up to one, and their purpose must be mainly to create lift. No limitations are imposed regarding the materials. Other limitations that must be considered in the design of a kitefoil are imposed on the structural design, since the kitefoil must have an optimized geometry that has to be easy to build and at the same time must be able to withstand the stresses to which it is subjected.
To understand the functioning of the hydrofoil, we have to analyze the physics of a easy wing profile. The wing of the hydrofoil creates a lift force, perpendicular to the flow direction, and a drag force, oriented with flow direction. The angle of attack α is the angle between the flow direction and the contour string.
The lift produced by a profile is directly proportional to the area of the wing surface “A_L” and proportional to the square of the relative velocity of the flow “v”; it also depends on the density of the fluid “ρ” and the on the lift coefficient “C_L”:
Resistence is a function of:
wing surface “A_R”;
relative speed of the water “v”;
drag Coefficient “C_D”;
water density “ρ”:
The lift and drag dimensionless coefficients C_L and C_D respectively, could be analytically, numerically or experimentally calculated, and are function of the profile shape.
Golden Rule for beginners: The bigger the better. Ok, so you have done a few lessons rented a board a few times and now your love for surfing has really grown. You are in the market for picking out a new board.
Which surf board suit me?
Our advice for beginners is always the bigger the better.
We are talking of a longboard around 8’ or longer, preferably “soft top”, for two reasons:
The soft top makes it a lot more buoyant for finding your balance and adjusting your pop ups;
Supplementing your paddling skills. Believe in the magic of the soft tops for making it easier to paddle fast enough to catch that curling wave.
If you have already rented a couple of times, you probably already know that you always have to always check out the board first for any dents or imperfections, because a smooth surface is a sweat ride.
If you are thinking: “A NEW BOARD! that man will cost way too much!”, you should also be aware that there is always the option of second hand boards and most local surf or skate shops have class oldies kicking round for prices much more in the surf and chill bracket.
The longer you surf for, the more confortable you’ll get with your board. People think that the higher your skill level goes up, the more you will edge towards a smaller short or Malibu board, but it really depends on what kind of wave your in the market for.
Our advice is that if you want to keep catching those smalls or even bigger waves, doing a bit of dancing on and chill fun on the board you should look at staying with your long, possibly just moving from soft top to resin ones.
If some strong curve, fast trick and one day some barrell action is in your expectations, a smaller sharper board is definitely more suited for you. There are 3 variable you need to keep always in mind when choosing the right board. Height / weight and own surfing ability. Once these bad boys are taken into consideration you just need to choose the best board for your personal taste. May it be bright purple or charcoal black.
PS: If you are going to be surfing on a regular basis, it’s a good idea to build yourself a quiver of different boards of all shapes and sizes, so that you can be out in the water everyday.
ORISTANO. From the Oristano waves of Capo Mannu to the Spanish ones of Almerimar to win the silver medal of the first edition of the World Youth Windsurfing Championship organized by the Club Victor Fernàndez and branded Pwa Youth World Cup.
This is the great new conquest of the very young and promising waver Nicolò Spanu who, at just 13 years of age with his board, managed to tame the wind and ride the wave of success that led him to one of the most coveted podiums of youth windsurfing.
Son of art, Nicolò inherited his passion from his father, Matteo Spanu, 42 years old from Oristano, one of the most famous Italian wavers and federal instructor at the Eolo windsurfing school, who, in the same days, was awarded the second placed in the Master category and fourth place in the overall category of the Spanish national windsurfing Championship Cef which also took place in the waters of western Almeria.
“After a few days of waiting – reports Matteo Spanu about the child – the climatic conditions have become favorable, the waves and strong winds have arrived that have allowed the six finalist boys to enter the water to compete in the discipline waves and to Nicolò to earn a deserved second place “.
The competition was attended by the 38 best young athletes from all over the world who faced each other in the different age categories, including the Youth Male Under 17 for which Nicolò competed supported by the sponsors ASD Lions fit club, Sabarrastyle, GAsails, Mormaii, 99bords, Maverx mart, AL360 and LSDfins.
Nicolò climbed to his first table when he was very small and grew up together with his great passion that he was able to cultivate by challenging the waves of the whole world following the trail trodden by his father, who is organizing the Italian windsurfing championship to be held in Funtana Meiga in the spring. Maui, Brazil, Cape Verde, South Africa are just some of the stops that have enriched the waver curriculum of the two Oristano athletes and allowed them to collect one medal after another.
But the young agonist proves to be a champion even out of the water, managing to balance the sporting commitments with the school ones and to obtain excellent results even among the school desks. “School has always been a priority – continues Matteo Spanu -. At the beginning of the year we withdraw the program in such a way that Nicolò can study even in the months in which we are away for the competitions and it happened to attend for short periods also the schools of the countries where the competitions are held. It is important to point out that Nicolò has these experiences because he deserves it by constantly engaging not only in sports, but also in studies ».
Hard training, correct nutrition, constancy, sacrifice and determination are just some of the keys that guarantee such a high level of success. “Both my son and I do two training sessions a week followed by our athletic trainer Daniele Concas of the Lions fit club of Oristano – concludes Matteo Spanu -. In Cagliari we do instead of
muscle treatments by the athletic trainer Giuseppe Pugliese ».
And after the Spanish experience the two wavers don’t stop and get ready to choose the best waves of the Moroccan sea, where the American Championship will be held in spring.