Foiling Classes

Foiling classes have fundamentally changed regatta sailing in recent years. Instead of being slowed by water friction, hydrofoils Foil Lift boats, boards and catamarans out of the water – speeds increase, manoeuvres become more demanding, and regatta formats more spectacular. From the Olympic iQFoil to the mixed catamaran Nacra 17 and pro series such as SailGP and the America's Cup, there is now a broad spectrum of foiling racing classes. This guide provides a structured overview of the most important classes, their differences and a sensible entry path.

What Defines Foiling Classes

In foiling classes, at least one Hydrofoil Wing is permanently integrated into the class rules or required for racing. Under normal conditions the hull or board leaves the water; only the foils and occasionally parts of the hull still touch the surface. This distinguishes foiling classes from classic one-design boats, where foils are optional or not permitted at all.

The key characteristics in competition:

• Reduced water friction – higher speed in the same wind
• Different manoeuvre technique – foiling tacks and gybes instead of classic tacks
• Finer balance – control via foil trim, body weight and Sail Pressure and Trim
• Higher material requirements – carbon, precise foil geometry, tighter tolerances

Foiling Classes in Regatta Sailing

The Most Important Foiling Classes at a Glance

Olympic Foiling Classes

Since the 2024 Olympic Games in Paris, three foiling disciplines have been firmly part of the Olympic programme. With this, World Sailing has consistently continued the trend towards foiling in competitive sailing.

iQFoil – Windsurf Foiling as an Olympic Discipline

The iQFoil replaced the RS:X class and combines windsurfing tradition with modern hydrofoil propulsion. Sailors ride a one-design board with a fixed foil setup. Competitions include slalom courses and upwind-downwind races on windward-leeward courses.

Typical requirements:

1. Excellent balance on the foil in varying wind strengths
2. Quick start reaction and clean mark roundings
3. Physical endurance for long regatta days
4. Precise reading of wind and waves on the course

Formula Kite – Kitefoil in the Olympic Programme

Formula Kite is the fastest Olympic sailing discipline. A kitesurfer is pulled by a large ram-air kite and rides on a specialised foil board. The regatta formats combine slalom sequences with upwind-downwind legs. Those who want to delve deeper into kite equipment and race setup will find details under Formula Kite as an Olympic Class.

Nacra 17 – Foiling Catamaran in Mixed Configuration

The Nacra 17 remains the only Olympic mixed class and combines catamaran handling with foiling speed. Two sailors steer the 17-foot catamaran with double trapeze and asymmetric spinnaker. Compared to skiff classes such as the 49er and 49erFX, the Nacra 17 offers more stability through the two hulls, but requires precise foil management from the crew.

Olympic Foiling Career Path

Dinghy Foiling: Moth, WASZP and RS Aero

Beyond the Olympic classes, there is a vibrant scene in single-handed foiling dinghies. The International Moth is considered the pioneer class: since the 2000s, the fastest single-handed sailors have been racing almost exclusively on foils. The class is technically demanding and aimed at experienced regatta sailors.

The WASZP was deliberately developed as a more accessible foiling class. It suits youth and adults who want to transition from the Optimist or Laser towards foiling. The setup is more robust than the Moth, the learning curve gentler – nevertheless, foiling remains a demanding technique.

Further relevant classes in the foiling sphere:

• RS Aero 9 – lightweight single-handed dinghy with optional foil configuration
• Flying Dutchman foiling projects – experimental approaches in classic classes
• Club-specific foiling fleets – local regatta series with mixed boat types

Pro Foiling: SailGP, America's Cup and New Formats

In the professional arena, foiling classes set benchmarks for technology and media presence. SailGP races with the F50 – a 15-metre foiling catamaran – in short, action-packed races in front of spectators and cameras. Crews of six athletes operate a highly sophisticated foil system with active height control.

The America's Cup with AC75 monohulls showcases foiling at the highest level: canting foils, complex wing profiles and crews of eleven people. These boats are one-design under Cup rules, but technologically at the forefront of the sport.

Foiling in Professional Sailing – Milestones

Choosing a Foiling Class: Decision Aids

Choosing the right foiling class depends on several factors. Not every class suits every body type, budget or career goal.

Those who want to make an informed decision between one-design and handicap systems will find supplementary basics under One-Design vs. Handicap Systems. For Olympic career paths, it is worth looking at Olympic Boat Classes – all foiling classes with Olympic status are placed there in the context of the overall programme.

Technology and Equipment in Foiling Classes

Regardless of class, some common technical principles apply:

Foil Setup and Trim

• Front wing – determines lift and stability
• Stabilizer (rear wing) – controls pitch and balance
• Mast and fuselage – connect the wings; length affects height above water
• Rake and shims – fine-tuning for wind strength and course

Safety Equipment

Foiling at high speed requires adapted protective equipment:

• Wetsuit or sailing suit depending on water temperature
• Helmet (mandatory in many classes)
• Impact vest for kite and windsurf foiling
• Life jacket according to class rules and organiser requirements

Details on kitefoil setup are described under Kitefoil Equipment and Setup.

Regatta Tactics in Foiling Classes

Foiling changes fundamental tactical decisions on the course. Speed differences between foiling and non-foiling phases are greater than with classic boats – whoever loses foiling flight falls back immediately.

Upwind:

• Foil earlier and more aggressively than the competition when wind and waves allow
• Calculate laylines with foil crash risk – a crash costs more than with classic boats
• Clear air has priority, because turbulence destabilises foiling flight

Downwind:

• VMG in Foiling optimisation through foil height and course angle
• Gybes with minimal speed loss – foiling gybes are decisive
• Use waves and wind pressure for free foiling

Starts:

• Higher speed at foiling starts – timing on the start line is more critical
• Position at the favoured end with enough room for acceleration

Foiling Speeds Compared

Training and Getting Started in Foiling Classes

Entry into foiling classes should be structured. A typical learning path:

1. Solid foundation in a classic class – e.g. Laser, 420 or windsurfing without foil
2. First foiling experience – hire equipment, foiling courses, training with coach boat
3. Stable foiling flight phase – take-off, maintaining height, controlled touchdown
4. Manoeuvres on the foil – tacks, gybes, start and stop
5. Regatta entry – club regattas, then national series

Checklist: Ready for Your First Foiling Regatta?

• Stable foiling flight in 10–15 knots of wind for at least 30 minutes
• Controlled foiling tacks and gybes without regular crashes
• Equipment checked and registered according to class rules
• Life jacket, helmet and other mandatory equipment available
• Regatta notice of race and sailing instructions read
• At least three training days on the race venue completed
• Emergency and capsize procedures discussed with crew or coach

Checklist: Equipment Before the Season

• Inspect foil for cracks, delamination and screw connections
• Check mast and rigging for correct settings and wear
• Inspect sails for one-design compliance and damage
• Replace protective equipment if damaged
• Spare parts (shims, screws, wing protection) in the regatta bag

Foiling Classes and the Future of Regatta Sailing

Foiling classes are shaping the future of regatta sailing. World Sailing, national federations and class associations are investing in youth programmes, training infrastructure and media formats. New classes such as wingfoil competitions are gaining importance, even if they are not yet Olympic.

For sailors this means: those who build foiling skills early are prepared for the coming decades of competitive sailing. At the same time, entry remains possible through accessible classes such as WASZP or club foiling programmes – foiling does not have to mean Olympics straight away.

Related Topics

• Nacra 17 – Foiling Catamaran in the Olympic Programme
• Formula Kite as an Olympic Class
• 49er and 49erFX – Skiff Class Compared
• Olympic Boat Classes – Overview
• Kitefoil Equipment and Setup