The FLIGHT F4 EVO foil is the Formula1 racing foil in our range. This evolution has been designed in collaboration with F4 USA. FLIGHT F4 EVO features full carbon pre-preg construction.
With an extended fuselage length, FLIGHT F4 EVO offers improved Upwind/Downwind performance and more comfortable riding. The new tail stabilizer with precise connection and adjustable wing angle dramatically increases stability, especially noticeable when jibing.
FLIGHT F4 EVO maintains a very stiff construction ensuring low drag, allowing the rider to use every gust for acceleration. The high-lift front carbon wing allows for early take off, great lift and generates amazing stability.
Racing above the surface.
Integrated carbon Deep Tuttle Base for maximum strength, elimination of movement and perfect load transfer.
x4 M6 titanium plated Stainless Steel bolts for maximum strength to weight ratio while preventing any corrosion problems. All using T-40 Torx drive, delivered with the product.
This stainless-steel feature minimizes drag at the end of the fuselage and provides a very precise connection through opposing screws countered in tension. There is also +/- 1.5 degree (total 3degree) adjustability available by changing the tension of the front top and bottom screws. Foil is perfectly trimmed for average weight sailor (75-80kg) with tail in neutral position. Heavier sailors, especially when using the large front wing in light winds or during the learning process might prefer slightly more stabilizing force that a down titled rear wing provides. At the same time lighter sailors, especially in strong wind conditions might find a neutral position creates excessive lift and will reduce the differential angle between two wings by tilting the tail slightly up. Tail can be disengaged, maintaining the angle setting.
At the most critical loading stress points (shaft leading and trailing edge-to-fuselage connections), we maintained a large radius in the corners. This has the benefit of distributing the tremendous compression forces existing in this area while at the same time creating a very smooth shape which minimizes turbulences common to hard edges.
Construction of our carbon foil features solid pre-preg carbon fiber layup with continuous unidirectional fibers connecting the shaft (mast) to the fuselage. This is by far the strongest and stiffest connection possible and also allows us to keep the shaft and fuselage cross-section minimal, reducing drag. This construction offers the best strength to weight ratio.
Fuselage is designed with a unique cross-section taper where maximum volume is concentrated in the areas of highest loads. The thickest section is the connection of the front wing to the mast; this is the area that transfers the lift of the foil to the board and supports the complete weight of the sailor, board and rig. FLIGHT F4 EVO fuselage has been extended by 12cm for added speed, stability and upwind performance.
During carving, there can be extreme torsional forces at the fuselage-to-wing connection area. These forces are created by different lifts on the two sides of the main wing. Part of the wing that is inside the curve experiences lower water velocity and creates lower lift. On the opposite side, the wing sees higher water velocity and creates higher lift; this differential in lifts, particularly extreme when using large wings, results in very high torsional load. To make sure there is adequate strength to support this stress, even with heaviest sailors, we designed a very large and wide connection area. This ‘saddle’ distributes torsion force over a larger area and significantly reduces the torque leverage on the wing screws.