Tusa: X-Pert Zoom Split Fin - (Fins)

Tusa: X-Pert Zoom Split Fin

TUSA Xpert Zoom Split Fins SF-8

  • Innovative hydrofoil design produces forward motion (lift) with less effort

  • New age elastic material with ridged reinforced double layered construction
  • Propeller-finTM technology and super lightweight design achieve the ultimate performance with less effort
  • Angled design for maximum kick efficiency
  • TUSA Patented Easy-to-adjust strap features quick release buckles

These fins are available in the following colors 

SS
FY
CBL
R
HBK*
*Two different blade stiffness:
        stiffer compound for HBK
        regular compound for other colors
Available sizes: Small, Medium, Large
Specify color using the Vendio Checkout button. If you do not specify a color we will select one for you.


 

Features of SF-8

The SF-8 X-pert Zoom fin's eye-catching design is causing quite a stir in the diving world! TUSA's production technology combined with principal design by Nature's Wing's developed this unique fin. The split fin is outfitted with an innovative, angled concept. Using the human anatomy as a reference, the SF-8 fin has been designed to provide maximum propulsion with minimum exertion.

27 Tech Reasons
When using a standard flat fin, propulsion is inhibited solely by fault of design. When the leg is completely extended, there remains an angle of 27 degrees between the heel of the foot and the calf of the leg, as shown in the diagram. This 27-degree angle causes 10% of the propulsion that is produced by the kicking motion to be lost. Because the fin is angled below the body during the kick phase, the body is pushed up and forward, instead of straight ahead.

With the SF-8 fin, that 27-degree angle has been incorporated into the fin. This means that when the leg is fully extended, even though the angle exists between the foot and the calf, the fin ends up parallel to the leg. This means that 100% of the energy expended during the kicking phase is directed toward the propulsion of the diver.

After several trials using the various fins currently available on the market, TUSA has confirmed that the SF-8 X-PERT ZOOM fin outperforms them all. It provides the most propulsion (graph 1), using the least amount of energy (graph 2).

SAMPLE speed (km/h) energy consumption (w/h)
X-pertZoom (SF-8)
 1.51 448
Competition's
Split Fin A		 1.49 662
Competition's
Split Fin B		 1.44 690
Paddle Type Fin 1.40 779
REMARKS:
*The Robot was operated with the same power at the same distance.
*The weight of the Robot is 156 lbs (70kg).
*Less energy consumption means better efficiency.
 

Features of FF-8 & FF-9

The Propelling Power
Traditional fins only use repulsive force to create propulsion. This normally means that in order to create strong propulsion, maximum effort is required, resulting in muscle fatigue not only for beginners, women, and middle-aged divers, but professionals as well. Added to which, the body moves left and right in reaction to the kicking needed to move forward, thus reducing propulsion. The SF-8 and FF-9 have blade that are split down the middle, so they take the shape shown in the diagram when kicked under water. This special blade shape creates propulsion (lift) by generating a pressure differential above and below the blade, in addition to the repulsive force created by kicking. The SF-8 and FF-9 are fins that allow all divers to create propulsion using only a small bent-knee kick, with a light rhythm.

 A light kick reduces water resistance and creates less turbulence.
Traditional fins required fin-work with large strokes in order to create propulsion, since they depended solely on repulsive force. The SF-8 and FF-9 obtain propulsion not only from repulsive force but also from lift, so it works ideally with a light, rhythmic kick. In other words, a small "bent-knee kick" will bring out this fin's best performance. This makes possible a light kick which creates less burden on the legs than with traditional fins. A light kick with small strokes reduces the diver's fatigue and the amount of air consumed. Also, small strokes reduce the resistance of the water on the entire body moving forward and also create less turbulence, so propulsion is smoother.

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    Keywords: Tusa:, X-Pert, Zoom, Split, Fin