Features of SF-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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