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Innovative hydrofoil design
that produces forward motion (lift) with less effort.
New age elastic material with rigid reinforced double
layered construction. Propeller-fin technology provides
the ultimate performance & comfort. Angled design for
maximum kick efficiency.
CRAZY ANGLE OR INCREDIBLE GENIUS?
When using the 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 a normal flat fin, 10% of the diver’s exertion
to propel him forward is lost by battling this upward
force.
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 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.
TUSA has developed the technology that has resulted in the
creation of a robot that can replicate the motions of a
human being. The robot is able to mimic the human underwater
kick ?bending at the ankle, knee, and hip in one fluid
motion. Using this robotic science, TUSA has been able to
analyze the performance of the fins under several different
conditions. The robot is able to swim through the water
using kick variations, such as a large scissor kick with a
slow repetition or a small flutter kick with a swift
repetition and vice versa. Using high-tech instrumentation,
this robot measures the energy expended during the kick and
the propulsive force that is created using that energy.
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 using the least amount of energy.
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.
The Principles Behind The Propeller
Technology TM
Differences in pressure usually results in movement of
some type.
There is a physical principle which states that the faster
a stream of air flows, the lower the surrounding pressure
drops. Suppose an object is moving in the direction shown
by the arrow in the diagram. The air is divided into an
upper and a lower stream at the front of the wing before
flowing around it and con- verging together behind the
wing. Since it takes both streams the same amount of time
to flow either side of the wing, it follows that the upper
stream flows faster than the lower stream, given that it
has to travel the longer distance. This difference in
speed creates a pressure differential. The same physical
property which makes objects move from high to low pressure
areas now also works to make the wing move from below to
above. This force is also applied in the design of aircraft
wings in a form called "lift", working to move the wing in
the opposite direction to the pull of gravity. The foils
on racing cars use the opposite effect to push the car
onto the road surface, thereby increasing the grip of the
tires.
The propelling power of the fins comes from a pressure
differential, not from a repulsive force.
Traditional fins only use repulsive force to create
propulsion. This normally means that 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 this kicking,
thus reducing the propulsion. The SF- 8 has a blade which
is split down the middle, so it takes 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 is a fin
which allows all divers to create propulsion with only a
light kick.
A light kick is as easy on the environment as it is on the
diver.
Traditional fins required fin-work with large strokes in
order to create propulsion, since they depended solely on
repulsive force. The SF- 8, however, 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, compared with traditional fins. Believe it or
not, a light kick benefits the environment as well as the
the diver! It not only reduces the diver's fatigue but
also creates less disturbance in the sand at the sea-
bottom. This reduces the possibility of sand swirling up
and covering coral reefs. This factor was also taken into
account when consideration was being given to the design
of the SF- 8.
GREAT FINS AT AN AWESOME PRICE!
Yellow not available.
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