After studying the fins of fish capable of very high speed swimming, we realised that taking into account wing design principles used in aviation could prove to be very important when designing better fins for competitors. Design principles used for airplane wing design are adaptable to fin design, supplemented with special properties for underwater application.
Finding the right shape
After studying the fins of fish capable of very high speed swimming, we realized that taking into account wing design principles used in aviation could prove to be very important when designing better fins for competitors. Design principles used for airplane wing design are adaptable to fin design, supplemented with special properties for underwater application.
Today’s fins are flexible, despite their relative stiffness, and during usage they take on a wave shape thus developing thrust. The shape of the wave is constantly being modified by the swimmer's muscle power, which radically reduces the fin’s efficiency.
The parts of the Swordfish that are responsible for generating thrust are aerofoil shaped, completely stiff and torsion free, thereby maintaining optimal efficiency through all phases of swimming.
Optimizing aspect ratio
When it comes to wings, the factor that most reduces performance is induced drag, which constitutes roughly 70% of all drag. This is caused by the vortex occuring at the wingtips. This can be most effectively tackled through incrementally reducing the generation of lift by narrowing the wings towards the wingtips, while at the same time maintaining the highest aspect ratio.
Today’s competition fins (the dolphin and its improved version the carrot fin) have an aspect ratio of approximately 1:1, which means that the length and the with of the fin is almost identical.
The aspect ratio of the Swordfish spans from 6 to 16 depending on the model. The design of different wingspans depending on the specific applications of the fin (competition, recreational, other technical uses) is made in accordance with current fin-swimming rules and ideal size parameters.
The swimmer’s requirements and adjustability are based on physical parameters.
Swordfish offers a compromise-free diving solution with its unique design. The fin’s stiffness (and thereby the force required to swim) is adjustable with the extendable connector attaching the fin to the foot holder. By fine tuning the fins to your immediate requirements, you can use Swordfish for long distance energy saving by shortening the connector, and hardening it by extension for short, intense swims.
Because no two swimmers have the same muscle capacity, Swordfish can be adjusted to suit the individual’s own strength and the particular swim technique.
Ease of transportation
The two wings of the Swordfish can be removed and reassembled without the need for any tools, making them easy to transport.
Being able to take the wings off doesn’t just allow for easy transportation and storage, but also enables the swimmer to use wings with different profiles, making the fins completely modular.