RRD DOLPHIN1, Manual

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The front and rear wings of the hydrofoil work as lifting devices. The wings create
a lifting force from the flow of water that travels across them at speed. This is the
reason why they are built with a specific sectional profile:
The shape of the wings’ profile shall not be modified, filled and sanded. Doing so
would alter the balance and prevent the correct operation of the kitefoil.
In order to guarantee the correct behavior and performances of the kitefoil, the rear
edge (trailing edge) of the wings must remain very thin, thereby making this part more
fragile in case of impacts. During handling and use of the kitefoil, the user should be
particularly cautious with these sharp areas in order to avoid any risk of injury.