Mantra Carbon Medium

Description

Mantra models are light and progressive fins, with high performance, suitable for spearfishing and sport freediving.

Mantra innovative fins, thanks to their extreme use flexibility, are the best-selling product by CETMA COMPOSITES.
In their different stiffnesses (Xsoft, Soft, Medium and Hard), they are suitable for different uses, hence for both sport freediving and spearfishing.
Thanks to the Dynamic Resonance System, these fins manage to maximize thrust by reducing fatigue: the feeling is that of soft fins with a powerful thrust.
The 33° bend angle has been designed to facilitate swimming on the surface even in the presence of strong currents.

•  Blade made of 100% aerospace prepregs high modulus IM7 fibers.
•  3D-Tech Proprietary Technology
•  Developed in cooperation with the Bi-fins CWT World Champion Michele Giurgola.
•  Finite Element Design of the blade (FEM Design) to optimize efficiency.
•  DRS (Dynamic Resonance System): new exclusive CETMA COMPOSITES technology.
• Water rail: Water rails with variable height and high efficiency.
• Dimensions: Width 195mm, Length from the bending angle 720mm, Angle 34°;
• Stiffness available: Super soft, soft e medium

DRS (Dynamic Resonance System) is the innovative and exclusive system discovered by CETMACOMPOSITES.
This new characteristic (DRS) was designed to allow to the MANTRA blades to meet the Resonance Frequency during finning. In few words, when a structure is forced
with a frequency close to its natural frequency, the amplitude of vibrations increases in a very efficient manner (low damping). Thanks to engineering design it was possible to modulate the stiffness and the mass of the blade so to “tune” the blade in a certain frequency range close to finning frequency, allowing to take profit of the
resonance phenomenon. The final feedback of the user is the possibility to obtain a huge push with very low fatigue.
The study to develop DRS was carried out with a laser vibrometer (LDV), with which it was possible to execute a modal analysis on several configuration and to optimize
the stiffness distribution.