Cetma Composites produces a range of high efficiency, fully scientifically engineered carbon freediving and spearfishing blades.

Carbon Blades PRANA key features:

• Blades 75% carbon fibre and 25 % S-glass fibre (aeronautical high resistance glass).
• The blades are made of 100% epoxy PRE-PREG produced with hot melt system and micro-toughened tetra-functional resin.
• 3D-Tech: Proprietary Technology, of CETMA COMPOSITES exclusive know-how, with high pressure, high temperature and high degree of applied vacuum, which lead to a component with 0% void level, without defects, with a uniform matrix/reinforcement ratio across the whole blade.
• FEM Design: PRANA blades have optimised trough an accurate design by means of Finite Element Softwares (FEM). The Design trough FEM software allows an optimized distribution of the stiffness, with the aim to obtain a deformation ensuring the maximum hydrodynamic efficiency.
• Signature model: developed in collaboration with the world champion CWT bi fins Michele Giurgola.
• DRS (Dynamic Resonance System) innovative and exclusive CETMA COMPOSITES system. DRS implies that MANTRA blades were designed to reach in resonance in a definite frequency of kick. Resonance phenomenon is well note physical phenomenon characterizing all the structures. Simplifying, when a structure is forced with a frequency close to its natural frequency the amplitude of vibration increase in a very efficiency way (low damping). Operating by distribution of the stiffness along the blade we “tuned” the blades to certain natural frequencies. So when the blade is driven, by kicking, with a certain frequencies range the user feeling is a very low effort with an outrageous thrust. This study is done using a laser vibrometer (LDV) to perform a modal analysis, which helps in a stiffness distribution design of the blade.
• Dimensions: Width 185 mm; Length from the bending angle 667 mm; bending angle 33 degrees.
• Available stiffness: soft (S) and medium (M).
• Colour choice: Yellow, Orange, Red.
• Footpocket fitting: CETMA COMPOSITES. Can also be adjusted to be used with other footpockets, such as Mares and Pathos.
• Water rail: CETMA COMPOSITES Water rails with variable height and high efficiency.
• Warranty: 2 years on carbon parts; 5 years if fitted with CETMA COMPOSITES footpocket.