The object of invention is a recreational boat, which can be used as a means of transportation on water for a variety of forms of recreation, in particular fishing, rowing, sailing.

There are many known types of floating vessels used for transporting people on water. They are of varied construction depending on their function, such as all kinds of boats, kayaks, pontoons, etc. A common characteristic for one group of floating vessels is the hull formed in such a way that the sides converge to form the bow, the stern and the bottom of the boat. The hulls are made of different material - predominantly wood and synthetics when it comes to recreational boats. Another group of floating vessels consists of inflatable vessels, where the hull is formed by filling a closed particularly shaped space delimited by airtight material with air. Yet another group of floating vessels consists of a foldable or permanent frame and a water resistant cover.

There is a boat known under the international patent application by the number WO02/092421, which consists in a hull made of reinforced plastic and rubber tubular piping placed separately along each side to ensure floatability. The hull has grooves along the length of its sides shaped in such a way that a larger surface area of the tubular piping connects with the hull. The boat found under publication WO2008/070406 has a hybrid hull containing two curved shells which form two keel fins allowing for the boat to stay afloat and acting as tilted hydroplanes when moving at greater speeds. Such a hull may also consist of an elongated middle shell which serves to absorb the effect of waves hitting the bottom section of the hull. In Poland, patent number 174408 reveals portable recreational boats which consist of a water resistant fabric fastened to stiff sides to form the bottom of the boat. The boat also has a stiff two-section floor articulated along the axis of symmetry of the boat and with the lower parts of the hull.

The description of the international patent application published under the number WO2011/082009 consists of a foldable boat with inflatable elements. It has a foldable hull constructed of many panels stretching from the bow to the stern of the boat. Each panel is connected to at least one other panel. The boat has one or more inflated elements which keep the boat in the unfolded state. The boat may also be equipped with an external inflatable element connected with the hull in such a way that it circles at least part of the circumference of the hull when unfolded. The boat may be equipped with seats.

The description in application number WO2012/092050 is also that of a portable foldable boat. It has a frame made of corresponding pairs of immobilizing tubular mounting elements joined by hinges. When

disassembled, they are located inside the water-resistant cover.

A recreational boat containing of a floater and a frame with fixtures for additional elements according to the invention is characteristic thanks to its frame which is constructed of permanently joined light resilient profiles, shaped to fit the replaceable boat-shaped floater located underneath. The floater has a thick bottom and thick sides and an open stern made from a low density material and is covered with a removable top cover and equipped with an additional element securing the frame and replaceable floater.

The replaceable floater of the boat is made of a material with a density of <40kg/m3. The thickness of the sides and bottom is >12cm.

The advantageously replaceable floater is a uniform element made from porous synthetic material.

The shape of the frame mirrors the outline of the floor of the replaceable floater and embraces the bottom part of the thick floor of the replaceable floater from the stern.

In one of the versions, there is an additional securing element in the form of a belt under the bottom of the replaceable floater and fastened to the frame at the bow and at the stern.

In a different version, there is an additional securing element in the form of a tube connected to the frame at the bow, traversing through the replaceable floater and fixed to the frame at the bow with a removable plate.

The frame is equipped at the front with step for the mast, in the middle with additional arms with oar handles for oars, and at the open stern in the back of the replaceable floater there is a transom for fixing an outboard motor.

The frame, mast step, additional arms and transom are made from welded elements of light metals or their alloys and covered in a layer of

anticorrosive protection.

The replaceable floater has two parallel grooves running along the bottom forming the keel in the middle from the bow to the stern.

The middle ridge of the bottom forming the keel of the replaceable floater found between the grooves is locate below the remaining lower part of the bottom of the replaceable floater. The cover is made of water-resistant material, it covers the upper side of the bottom and the sides of the replaceable floater and its circumference is equipped with an elastic element.

The main advantage of this recreational boat is the comfort and safety of moving in it, as well as the fact that it is very lightweight and easy to transport to various basins. Its construction allows for a variety of uses of the boat.

These and other characteristics of the invention will be clear from the following description of a preferential form of embodiment, given as a non- restrictive example, with reference to the attached drawings wherein:

Fig. 1 represents a view of the boat;

Fig. 2 represents a view of the frame of the boat with additional elements; Fig. 3 is a cross-section of one of the variants of the replaceable floater.

The recreational boat consists of frame 1, replaceable floater 2 and the cover 3. The replaceable floater 2 is made as a one-piece element of expanded polystyrene or polypropylene foam from a pressure mold, in the shape of a boat with a thick bottom and thick sides. The sides of the floater are no less than 12 cm thick, preferably 30 cm and they converge at the front section to form the rounded bow o the boat, while the stern is open. The bottom of the floater is preferably 25 cm thick no less than 12 cm thick. In one of the versions of the invention, the underwater side of the bottom of the floater 1 is shaped like an upside down letter "w", created by two parallel lengthwise grooves 4. The middle ridge 5 forming the keel between the grooves 4 is located beneath the line of the remainder of the waterside of the floater bottom 2. The upper side of the floater as well as its sides are enclosed in a cover 3 hich whose shape corresponds with that of the W

- 5 - floater, it is made of water-resistant material and stretches past the sides to half or more of their height and is equipped with an elastic element in its circumference which secures it around the outer surface of the sides. The bottom of the cover 3 is pressed to the upper side of the floater 2, with the help of the frame 1 which, is the shape of the outline of the upper side of the bottom of the floater 2, while at the stern, it partially embraces the lower side of the floater bottom 2. The frame 1 is equipped with an additional securing element which secures the floater 2 from slipping out of the frame 1. The securing element may be in the form of a tube 6 connected and to the frame 1, traversing through an opening in the bow of the floater 2 capped with a removable plate adhering to the floater on the outside of the bow, as shown in fig.2. In an different version, the securing element may be a belt 10 stretched along the lower side of the floater bottom 2, adhering to its middle ridge and fastened to the frame 1 at both the bow and the stern. The frame 1 may also possess additional elements allowing for the attachment of additional equipment of the boat. These are in particular additional arms 7 lying on top of the sides and equipped with oar handles in the middle section of the sides. In its most universal version, the frame 1 is equipped at the bow with a step 8, while in the back open stern section, the frame 1 is equipped with a transom 9 allowing for the mounting of an outboard engine. The frame 1 and its additional elements, such as the arms 7 for attaching the oars, the bracket 8 for attaching the belt 10 and mounting the mast and the transom 9 for mounting the engine are made of welded light tubing and aluminum profiles, whose surface is protected from corrosion, for example by painting them with an anticorrosive paint or covering them with any other kind of anticorrosive layer. The combination of the resilient one-piece floater 2 and the fitted frame 1 create a rigid floating construct, while the water-resistant cover 3 ensures the comfort of the boat's users and protects the floater from possible damage upper side the boat. The thick sides and the bottom of the floater 2 render the boat resistant to perforation, while the open stern allows for the automatic exit of water which may enter the boat over the sides, for example in larger waves. For the comfort of the users, the cover may be equipped with pockets, handles or straps for additional equipment. It may also include a small tent fixed at the bow as protection from water.

The floater 2 of the boat may have a variety of shapes which function as a boat with a bottom and sides, as well as a variety of sizes and thicknesses, depending on the user's need. There are numerous methods of connecting the profiles which form the frame 1. The described example does not exhaust the possible versions of the invention. In each version, the construction and connecting of the three basic elements of the boat: the floater 2, the frame 1 and the cover 3, makes the construct an exceptionally functional recreational floating vessel, that ensures its users a high degree of safety and comfort while on the water. The construction of the boat allows for the easy replacement of each of its main elements in case of damage. The materials used in its construction, in particular the porous synthetic materials and the light profiles of the frame allow for very easy transport, for example on the roof of a car.