Swim fin with longitudinally moulded blade, with improved hydrodynamic performance

摘要

The object of the invention is a raft for swimming with a long-drawn feather, improved hydrodynamic performance, intended in particular for learning to swim, to swim, to swim, to rehabilitate or to dive, to increase the speed and efficiency of swimming with bottom-down floating limbs,especially when swimming with a crab or dolphin and when moving your lower extremities sideways and back while swimming with a frog on your breasts. The skirt of the shoe (1) of the fins forming the part fixing the foot of the floater containing the sole,the side and top of the boot, and the pen (2) of the fins forming the working part of the fins serving as a floating motor, are characterized by the fact that the feather (2) of the fins consists of two longitudinal profiles (2') with a V-shaped or U-shaped cross-section, with an angle of shoulder spread from 20 to 150 degrees, attached to the front edge of the boot (1) of the heel, the cross-section surface of each profile (2') increases in the opposite direction to the boot (1) of the heel, and the longitudinal profiles (2') are joined together in the end z one of the inner edge of each of the profiles creating a connection (4),and between the inner edges of the longitudinal profiles, the combination of these edges and the front edge of the heel shoe is a gap (3) forming a triangular flow channel, in addition, each longitudinal profile (2') of the pen (2) of the fins shall be equipped with a flat stabilizing list (6) located on the outer edge of the profile, so that the outline shoulders (6) extend both above and below the contractual plane extending the heel of the fins and the list shall be: favourably perpendicular to that plane, with the boot (1) of the fins and the feather (2) of the fins,They are made of a thermoplastic elastomer in the form of polyurethane, with Shore hardness between 30 and 90, and stabilizing sheets (6) are made of Shore hardness polyurethane between 30 and 120.