-25%

Foil Shim Tail V3 ATMO - Lower Titanium 0° / Black Second Hand 14989

Name: Foil Shim Tail V3 ATMO - Lower Titanium 0° / Black Second Hand 14989
Brand: GONG
SKU: OC14989
Price: 83.0 CHF
Availability: InStock

Shim Tail in very good condition, showing very slight marks (cosmetic only, very subtle).

See Description

CHF 83

CHF 83 ~~CHF 111~~

-25%

Foil Tail Shaft V3 ATMO - Team Series

Lower / M

Tef-Gel 10G

10g

Foil SCS Nuts Titane

Open

            1
            -99999

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ref : OC14989

Quality boards conceived in France

Direct sale from shaper to surfer

Pay in multiple installments

Description

Programme

The metal rear fuselage part that precisely adjusts your Tail Wing angle of attack while delivering a perfect hydrodynamic line and flawless stiffness.

Overview

The Shim Tail V3 Atmo is the high-precision fuselage part that sets the angle of attack of your Tail Wing on the adjustable V3 Atmo rear system.

Far more than a simple shim, it is a true structural, profiled metal part. Its geometry precisely connects the Tail Shaft to the Tail Wing while integrating the adjustment directly into the foil’s hydrodynamic line.

The range offers +1°, 0°, -0.5°, -1°, -2° and -3° angles of attack. Just a few tenths of a degree are enough to noticeably change front foot pressure, take-off, pop, repop, pumping, carve radius, stability and glide.

0° corresponds to the reference angle of attack calculated for the Tail Wing. A negative angle progressively increases its nose-up effect and adds more front foot pressure. +1° reduces this effect and lets the foil glide more freely without pull in your hands.

Each angle of attack is available in Upper and Lower architectures. The Upper offers more protection to the Tail Wing from contact with the bottom. The Lower moves it farther from the surface and from the Front Wing’s wake to limit ventilation and maximise efficiency.

The fittings on the V3 and Micro V3 Atmo versions are matched to the diameter of their respective Tail Shaft and fuselages. However, the interface receiving the Tail Wing remains identical in order to preserve compatibility with all corresponding rear wings.

Available in aluminium or titanium, the Shim Tail lets you build the exact ride feel you are looking for, with a perfectly maintained angle of attack and flawless hydrodynamics.

The Shim Tail V3 Atmo gives you a few degrees of adjustment that can completely transform your foil, and with it your level and ease in flight.

The adjustment that transforms the plane

The angle of attack of the Tail Wing is one of the most sensitive adjustments on a foil.

A few tenths of a degree are enough to modify the torque generated by the rear wing and therefore the complete balance of the plane. The front foot, takeoff, pumping, pop, repop, stability, maneuverability, and turning radius evolve simultaneously.

The 0° Tail Shim maintains the reference angle of attack calculated for the Tail Wing. The -0.5° already adds a bit of front foot pressure and makes the foil more eager. The -1° produces a noticeable difference. The -2° and -3° create radical behaviors for riders who know exactly what they are looking for.

Conversely, the +1° reduces the nose-up effect of the Tail Wing. The plane requires more back foot pressure, takes off later, and allows the foil to glide further without hand traction.

A Tail Shim is a small part, but its effect on the water is immense.

Customization without hydrodynamic compromise

Creating an incidence adjustment is simple if one accepts placing a shim between two surfaces that are no longer perfectly faired.

This superposition can create steps, cavities, overhangs, localized thickening, or exposed edges that disrupt flow around the Tail Wing.

The V3 Atmo system was developed with a different approach. The Tail Shaft, Shim Tail, and Tail Wing recess are designed as a complete hydrodynamic assembly.

The Shim Tail is a genuine profiled metal part. Its geometry defines the incidence while precisely connecting the volumes. The Tail Wing rests directly in its reference seat, without semi-flexible parts or breaks in the aircraft's line.

Each adjustment thus maintains perfectly controlled hydrodynamics. Customization and performance progress together.

Understanding Shim Tail angles

To fully understand the figures, remember that they indicate how the Shim Tail modifies the position of the Tail Wing's leading edge in relation to its reference incidence.

A +1° raises the Tail Wing's leading edge by 1°. A -3° lowers it by 3°.

Therefore, the more a Tail Wing dives nose-down with a negative number, the more it forces the board's nose to rise.

A negative angle number provides more front foot pressure, facilitates takeoff, increases pop and repop, gives a more rhythmic and powerful pumping action, and reduces turning radii. With a wing, lowkite, or kite, this additional support also allows for more effective opposition to the rig's pull.

The 0° maintains the balanced behavior calculated for the model, which we would integrate into a single-piece stabilizer. This is not necessarily a horizontal Tail Wing in relation to the fuselage.

The +1° reduces front foot pressure, requires more back foot pressure during acceleration, lengthens turning radii, and promotes glide without traction in the hands. It takes off later but limits strong nose-up movements when descending bumps.

The exact effects always depend on the Tail Wing, its size, the Front Wing, and the length of the Tail Shaft.

Shim Tail V3 Atmo Technology: High-precision machined metal part

Key points summary:

Structural and profiled metal part directly integrating the Tail Wing's incidence.
Geometry dedicated to each angle, each Upper or Lower architecture, and each V3 or Micro V3 Atmo diameter.
Precisely machined functional surfaces to ensure angle, alignment, and mounting repeatability.
V3 SuperLock conical connection with the Tail Shaft for a firm and self-tightening fit.
Standardized Tail Wing footprint common to V3 and Micro V3 Atmo platforms.
Deep thread depth to firmly hold the Tail Wing without a compressible interface part.
Streamlined connections to maintain a continuous hydrodynamic line in every configuration.
Permanent and legible marking indicating the architecture and incidence of each part.
Aluminum version for combining precision, lightness, rigidity, and low cost.
Titanium version to maximize mechanical resistance, durability, and finish level.
Dimensional, functional, and visual controls at each stage of production.

Technical sheet

Foil Shim Tail V3 ATMO - Lower Titanium 0° / Black Second Hand 14989 Lower Titanium / 0° / Black

Download the user guide

Buying guide

Who is it for?

Shim Tails V3 Atmo are for riders using a Tail Shaft who want to fine-tune the behaviour of their aircraft.

They suit both riders looking to adapt the foil to their stance and pressure distribution, and experts wanting to evolve their flying style or optimise a setup for a very specific programme.

The adjustment applies across all disciplines: pumping, downwind, surf foiling, SUP foiling, freefly, waveriding, wing foiling, lowkite, kite foiling, freestyle, high-performance freeride or race.

The Shim Tail is especially interesting for riders who like to understand, compare and refine their sensations. Just a few tenths of a degree can already make a clear difference under your feet.

Why?

The Shim Tail lets you precisely adjust the incidence of the Tail Wing without changing it.

This incidence acts directly on the torque generated by the rear wing and therefore transforms front foot pressure, trim, take-off, pumping, pop, repop, stability, carve radius and glide.

The Shim Tail is not just a simple shim. Its shape defines the angle while precisely fairing the Tail Shaft into the Tail Wing. The adjustment remains rigid, consistent and perfectly integrated into the foil's hydrodynamic line.

The range offers +1°, 0°, -0.5°, -1°, -2° and -3° incidences, in Upper and Lower architectures and for V3 and Micro V3 Atmo diameters.

What does 0° mean?

The Shim Tail 0° corresponds to the reference incidence defined for each Tail Wing.

It does not mean that the rear wing sits horizontally at 0° relative to the fuselage. Depending on the model, its mount may already natively incorporate several degrees of incidence.

0° simply means that the Shim Tail adds or removes no angle relative to the calculated optimum behaviour for the Tail Wing, the one we would use on an equivalent one-piece stab.

In fact, we machine a mount directly into the carbon, shaped like the footprint of the shims and the shim tail under or on the tail wings. The outer face of this mount is at 0°. It is this mount that creates the tail wing's native angle with the 0° shim (the fuselage axis). Integrating this angle natively avoids having to use shims with very steep angles that would be highly asymmetrical, very thick, and would offset the retaining screws in the fuselage. Choosing to integrate the angle we recommend for each tail wing shape is therefore logical and optimises every parameter.

It is always the best starting point for discovering a Tail Wing and then understanding the effect of the other settings.

Which angle should you choose?

U+1°, L+1°: less front foot pressure than the calculated optimum of the Tail Wing profile. This setting requires more back foot pressure or means moving the foil forwards in the boxes. It promotes glide without pull in the hands (downwind, freefly), but delays take-off and limits control as speed increases.

U0°, L0°: optimum balance according to our calculations. This does not mean a Tail Wing that is horizontal relative to the fuselage, but rather no added or removed angle relative to its reference incidence.

U-0.5°, L-0.5°: adds a little front foot pressure. The foil becomes more reactive and livelier, without radically changing the setup's behaviour.

U-1°, L-1°: the difference becomes noticeable. The foil requires more front foot pressure and some riders will need to move it back in the boxes or shift their hips well forwards. This setting lets you push hard through the front foot without the aircraft collapsing nose down.

U-2°, L-2°: takes the effects of -1° to an XXL level. The behaviour becomes radical and demands real mastery of your pressure distribution.

U-3°, L-3°: an extreme setting, rarely useful with GONG Tail Wings but potentially relevant with other designs. The foil becomes full front foot and will often need to be moved a long way back in the boxes.

Tail Shaft length amplifies or softens the feel. The Short will be lively, the Medium balanced, and the Long cooler and more progressive.

Pairing a Short Tail Shaft with a -3° will send you to the moon, while a Long with +1° will deliver an extremely calm ride.

Why use a negative angle setting with a rig?

A wing, a lowkite or a kite pulls the rider forwards and changes the natural balance of their pressure distribution on the aircraft.

A negative setting adds more front foot pressure and lets you oppose this pull from the rig more effectively. The rider can sheet in, accelerate and transfer the pull into the front leg without letting the foil collapse nose down.

This setting is more physical, but it makes pressure more consistent. It avoids having to move your hips back and shift your centre of gravity at high speed, which would add a particularly sensitive variable in controlling the aircraft.

Why use +1° with no pull in the hands?

Without a rig, excess front foot pressure can make the nose rise unnecessarily when dropping into bumps or during strong accelerations.

+1° reduces the Tail Wing's nose-up effect, lets the aircraft glide more freely and limits these nose rises on every bump descent, for example.

In return, the foil takes off later, requires more back foot pressure and can lose control at high speed because you have to push more and more through the back foot as speed builds. So this is a very specific setting, to be chosen with full awareness of its effects.

Upper or Lower?

The Shim Tail Upper fits exclusively with a Tail Shaft Upper and a Tail Wing Upper.

The Shim Tail Lower fits exclusively with a Tail Shaft Lower and a Tail Wing Lower.

Both architectures offer the same angles and the same precision, but their position in the water changes their practical and hydrodynamic benefits.

The Upper places the Tail Wing above the Shim Tail. It is better protected from contact with the bottom and is particularly well suited to beach starts, surf foiling, waveriding and launches in shallow water.

The Lower places the Tail Wing below the Shim Tail. It sits further from the surface and from the disturbed wake of the Front Wing. This architecture reduces the risk of ventilation and maximises efficiency, especially in downwind, pumping, freefly or high-performance freeride.

In return, a Tail Wing Lower is more exposed to contact with the bottom.

Upper and Lower architectures are not interchangeable.

V3 Atmo or Micro V3 Atmo?

The Shim Tail diameter must match that of the Tail Shaft.

V3 and V3 Atmo are the same standard. There is no technical difference, it is simply an aesthetic update. So your entire V3 system is 100% compatible with V3 Atmo parts.

Please note:

A standard V3 Atmo Tail Shaft uses a V3 Atmo Shim Tail.

A Micro V3 Atmo Tail Shaft uses a Micro V3 Atmo Shim Tail.

The two versions are not interchangeable on the Tail Shaft side, because their section and interface are different.

The Tail Wings, however, remain common to both diameters thanks to an identical footprint. So the same Tail Wing can move from a V3 platform to a Micro V3 Atmo platform by using the appropriate Tail Shaft and Shim Tail.

Which material?

The aluminium version offers the best balance of precision, stiffness, accessibility and the ability to multiply angle options at a lower cost.

You will, however, need to replace aluminium parts regularly because of galvanic corrosion. This corrosion can happen inside the part, without you being able to see it. To avoid an unexpected breakage offshore, we recommend using protection methods and products for aluminium parts and replacing these parts every year, just like your leashes for example. It is a safety issue. A foil that breaks offshore can put you in a very difficult situation. We sell aluminium parts at deliberately very low prices to help you renew them at the pace this material requires. Do not conclude that GONG aluminium is worse than others, that is false. We are simply being cautious and prefer to keep users safe by informing them.

It is the logical choice for gradually building your quiver of settings, testing different incidences and regularly evolving your setup.

The titanium version is the most premium option. It delivers maximum mechanical strength, durability and finish quality, especially for riders who put heavy loads through their gear or change configuration very frequently.

Both materials use the same geometries, the same angles and the same compatibilities. So the choice depends on budget, intensity of use and the level of finish you are looking for.

As for colour, simply choose the one that makes you want to ride most.

Where should you start?

The aluminium version offers the best balance of precision, stiffness, accessibility and the ability to multiply angle options at a lower cost.

You will, however, need to replace aluminium parts regularly because of galvanic corrosion. This corrosion can happen inside the part, without you being able to see it. To avoid an unexpected breakage offshore, we recommend using protection methods and products for aluminium parts and replacing these parts every year, just like your leashes for example. It is a safety issue. A foil that breaks offshore can put you in a very difficult situation. We sell aluminium parts at deliberately very low prices to help you renew them at the pace this material requires. Do not conclude that GONG aluminium is worse than others, that is false. We are simply being cautious and prefer to keep users safe by informing them.

It is the logical choice for gradually building your quiver of settings, testing different incidences and regularly evolving your setup.

The titanium version is the most premium option. It delivers maximum mechanical strength, durability and finish quality, especially for riders who put heavy loads through their gear or change configuration very frequently.

Both materials use the same geometries, the same angles and the same compatibilities. So the choice depends on budget, intensity of use and the level of finish you are looking for.

As for colour, simply choose the one that makes you want to ride most.

Compatibility

Each Shim Tail must match both the Tail Shaft diameter and the Tail Wing architecture.

A V3 Upper Shim Tail works with a V3 Upper Tail Shaft and an Upper Tail Wing.

A V3 Lower Shim Tail works with a V3 Lower Tail Shaft and a Lower Tail Wing.

A Micro Upper Shim Tail works with a Micro Upper Tail Shaft and an Upper Tail Wing.

A Micro Lower Shim Tail works with a Micro Lower Tail Shaft and a Lower Tail Wing.

The Tail Wings remain compatible with both diameters thanks to their shared footprint.

Before assembly, always check the V3 or Micro diameter, the Upper or Lower architecture, and the incidence marked on the part.

Equipments

Each Shim Tail comes with its dedicated screw set.

2 M6 x 14 mm T30 screws to attach the Tail Wing to the Shim Tail;
1 extra M6 x 12 mm T30 screw to replace the rear screw on the thinnest tail wings.

Stainless steel hardware designed to handle foil loads and marine use.

The Tail Shim V3 Atmo screws in from inside the Tail Shaft V3 Atmo using the standard GONG Torx assembly key. No visible screws on the outside at the rear of the Tail Shaft. The long screw used to connect the Tail Shim to the Tail Shaft is supplied with the Tail Shaft, as its length depends on the Tail Shaft length. Also available as a spare part, of course.

The Upper or Lower Tail Wing screws onto or under the corresponding Tail Shim using two screws. Two screw lengths are needed to fit the full range of Tail Wing models, as some rear wings are very thin.

These two screws are visible, in standard GONG M6, and therefore very easy to fit and remove.

A quick connection to install, perfectly rigid while riding, and easy to remove after the session.