Sailing hydrofoil

Short description: Sailboat with wing-like foils mounted under the hull

Hydrofoiling wingsail catamaran 17

A sailing hydrofoil, hydrofoil sailboat, or hydrosail is a sailboat with wing-like foils mounted under the hull. As the craft increases its speed the hydrofoils lift the hull up and out of the water, greatly reducing wetted area, resulting in decreased drag and increased speed. A sailing hydrofoil can achieve speeds exceeding double and in some cases triple the wind speed.

Both monohull and multihull sailboats can be retrofitted with hydrofoils, although greater stability can be achieved by using the wider planform of a catamaran or trimaran.

## Contents

* 1 Typical configurations
* 2 Types of hydrofoils
* 2.1 'T' Foils
* 2.2 'C' Foils
* 2.3 'S' Foils
* 2.4 'L' Foils
* 3 Foiling classes
* 3.1 Monohulls
* 3.1.1 International Moth
* 3.1.2 Waszp
* 3.1.3 69F
* 3.1.4 Laser dinghy
* 3.1.5 Optimist
* 3.1.6 AC75
* 3.1.7 IQFoil
* 3.2 Keelboat/Hybrids
* 3.2.1 IMOCA 60
* 3.2.2 MW40OF
* 3.3 Catamarans
* 3.3.1 America's Cup catamarans
* 3.3.1.1 GC32
* 3.3.1.2 AC72
* 3.3.1.3 AC45f/AC50
* 3.3.2 F50
* 3.3.3 C-Class catamarans
* 3.3.4 A-Class catamarans
* 3.3.5 Nacra 17 catamaran
* 3.3.6 Nacra F20 catamaran
* 3.3.7 Flying Phantom
* 3.3.8 iFLY15
* 3.3.9 UFO
* 3.3.10 GunBoats G4
* 3.4 Trimarans
* 3.4.1 TriFoiler
* 3.4.2 WindRider Rave
* 3.5 Other Wind Craft
* 3.5.1 Wind foiling
* 3.5.2 Foil Kitesurfing
* 3.5.3 Wing Foiling
* 4 Experimental designs
* 5 See also
* 6 References
* 7 External links

## Typical configurations

Some multihulls use three foils; two main forward foils provide lift so that the boat "flies" while a horizontal foil on the rudder is trimmed to drive and control altitude. On catamarans, a single main foil can be attached between the hulls just in front of the center of gravity and at 2 degrees of incidence, spanning the tunnel with supporting struts. Hydrofoil catamarans are also called foilcats.[citation needed]

Multihull sailboats can also employ hydrofoils only to assist performance. Just as daggerboards and rudders are foils that enhance the control of a boat, assisting hydrofoils provide lift to the hull to reduce the wetted area without actually lifting the boat completely out of the water.

Monohull boats typically employ a "ladder" arrangement of hydrofoils splayed out with a dihedral angle of 50 degrees, with a stabilizing rudder foil. One of the earliest examples is the Monitor boat from 1957.[1] This design offers the advantages of maximum lifting foil area at slow speeds and less at higher speeds, but with some additional drag arising from the dihedral support of the outboard ladder foils.

## Types of hydrofoils

There are 4 main types of hydrofoils used in sailboats, in which each type employ similar and different advantages to each other. Overall, 'T' Foils fit into their own category of single direction lift, while 'C', 'L', and 'S' fit into a category of multidirectional lift.

### 'T' Foils

'T' Foils, commonly seen in the International Moth class and the AC75 class, contains a vertical component connecting to a horizontal wing, providing lift for the foil. 'T' Foils only provide lift in the perpendicular direction from the horizontal wing component and hence are typically used only for upwards lift instead providing lift in the vertical and horizontal direction. 'T' Foils are often equipped with an adjustable trailing edge that attaches to some flight control sensor to ensure steady flight. This system was easily implemented in the Moth class.[2]

### 'C' Foils

'C' Foils also known as curved daggerboards are shaped as a constant curve and are allowed to travel up and down within its casing, changing the area of the board exposed to the water. When the board starts at its maximum height above the water, it is near vertical and employs a lifting force normal to the exposed surface or otherwise horizontal lift. As the board is pushed lower, the 'C' shape forces a larger portion of the board to become horizontal, introducing a larger vertical component in the lift. This variation in configuration allows for many boats to provide a higher upwind angle due to the horizontal lift in combination to the vertical lift. The curved boards also solve the issue of increased drag at high speed, while no longer requiring a strong horizontal lift by adjusting the exposure of the board to the water.[2]

### 'S' Foils

The 'S' Foil contains the slight shape of a 's' and operates in a similar manner to the 'C' Foils, with the reverse order of operations, such that when lowering the 'S' Foil the horizontal lifting force exerted increases due to a more vertical orientation in the board.[2]

### 'L' Foils

'L' Foils consist of a curve edge followed by a sharp 90 degree bend such that the bottom of the foil sits upright when not submerged in the water, and sits at a 45 degree angle from horizontal when submerged entirely. Similarly to the 'C' and 'S' foils, the amount that the foil is lowered changes the amount of vertical and horizontal lift being created.[2]

## Foiling classes

### Monohulls

#### International Moth

Rohan Veal sailing a Bladerider

The most widespread use of hydrofoils in sailboats to date has been in the International Moth class. Andy Paterson of Bloodaxe boats on the Isle of Wight is widely considered to have developed the first functional foiling Moth, though his boat had three foils in a tripod arrangement. Brett Burvill sailed a narrow skiff Moth with inclined surface-piercing hydrofoils to a race win at the Moth World Championships in 2001 in Australia , which was the first time a hydrofoil Moth had won a race at a World Championship. This hydrofoil configuration was later declared illegal by the class, as it was felt to constitute a multihull, which is prohibited by class rules. Initially Ian Ward in Sydney, Australia developed the first centerline foiling Moth which demonstrated that sailing on centerboard and rudder foils alone was feasible. Subsequently, Garth and John Ilett in Perth, Australia developed a two-hydrofoil system for the Moth with active flap control for the main foil via a surface sensor. John's company Fastacraft was the first to produce a commercially available hydrofoil International Moth. Fasta Craft's Prowler design, superseded in 2008 by the F-Zero, features a carbon-fiber hull, inverted "T" foils on the centerboard and rudder, and can reach speeds of over 27 knots. Fasta Craft has since been joined in producing hydrofoil Moths by several other companies, including Bladerider, Assassin, Exocet, and Aardvark Technologies.

Although initially debated fiercely within the class, the adoption of hydrofoils has proven a success for the International Moth class, with rapid fleet growth in the years since 2001. All World Championships since 2004 have been won by hydrofoil-equipped Moths, which can become foilborne in as little as six knots of breeze when steered by an experienced sailor of lighter weight. The class rule remains open to development of all boat components including hydrofoil systems, and development within the class continues to be spurred by both commercial and individual/amateur efforts.

#### Waszp

Waszp

The Waszp class founded in 2016, is almost identical to the current configuration of the International Moth class. The class contains the same "T" foils design on the centerboard and rudder, with the same narrow hull shape. The largest difference between the two classes is that the Wazsp is heavier due the foils being constructed out of aluminum instead of carbon fiber. Due to heavier design, the top speed of the waszp is only 26.7 knots, however its cheaper materials have made it a popular and accessible class, despite its relative youth. Most recently, the Waszp class has partnered with SailGP to develop a pathway for young sailors to work their way into the professional field of sailing.[3][4]

#### 69F

The 69F also known as the Persico 69F is a 3-4 person fully carbon foiling monohull, resembling that of a skiff, designed by Wilson-Marquinez and built by Persico Marine. The newly founded one-design class had its first racing series in 2020, starting in Europe and then making its way over to the United States in 2022. The boat consists of a singular t-shaped rudder foil, two 'L' foils on each side, and a singular daggerboard in the center of the boat for stability. The 69F is 6.9 meters long and contains a fully battened main sail and jib alongside a gennaker, totaling a sail area of 69.0 meters.[5][6]

#### Laser dinghy

Glide Free Foils on a Laser sailing dinghy

The first time a Laser foiled was in December 2009 by Ian Ward in Sydney, Australia. Top speeds of around 23-25kts are possible with this kit. The foils can be removed and the boat remains class legal. This foiling system is unique in that it is retractable, has flapless foils and the height sensing 'wand' is integrated within the daggerboard.

#### Optimist

The "world's least advanced sailboat" was converted to hydrofoiling by the Chalmers University of Technology, in Sweden, in 2017.[7][8]

The Optimist, only 2.3 metres in length and with a sail area of 3.3 square metres, is normally limited to speeds below 4 knots. The hydrofoils allows the optimist dinghy to achieve 12 knots in only 12 knots of wind.

#### AC75

The AC75 (America's Cup 75 class) is a 75 ft sailboat class, governing the construction and operation of the yachts used in the 2021 America's Cup. The boat type is a foiling monohull with canting ballasted T-wing hydrofoils mounted on port and starboard topside longitudinal drums, a centerline T-wing rudder, and no keel. Speeds of 50 knots were predicted based on computer simulations [9] and in fact have been exceeded in the Prada Cup by the America Magic's boat in January 2021.

#### IQFoil

The IQFoil windsurfer class selected by World Sailing to be used in the Summer Olympics starting 2024.[10]

### Keelboat/Hybrids

#### IMOCA 60

The IMOCA 60 class, originally a non-foiling offshore racer competing in around the globe races such as the Volvo Ocean Race and the Vendeé Globe was re-designed with S-shaped daggerboard foils. The new foil designs allowed for enough lift a portion of the boat out of the water, making it a partially foiling boat, reducing the overall drag and increasing the top speed of the boat.[11] The IMOCA 60 Hugo Boss 7, skippered by British skipper Alex Thomson is one the recent IMOCA 60 boats with semi foiling features.

#### MW40OF

While only in its design phase, the MW40OF is modeled after the 69F and similar to other offshore racers to be a fully foiling offshore racer equipped with C-shaped daggerboard Foils and T-shaped rudder foils and a crew of 5 people.[12]

### Catamarans

#### America's Cup catamarans

Foils have been used in the America's Cup since 2013.

##### GC32

Main article: Engineering:GC32

The GC32 is carbon fibre production hydrofoil catamaran 32 feet in length (9.75 meters). It has a top speed of about 40 knots (74 km/h; 46 mph).[13][14] They are sailed in the GC32 Racing Tour, and have replaced the Extreme 40's in the Extreme Sailing Series.[15]

##### AC72

Main article: Engineering:AC72

The 2013 America's Cup featured daggerboard catamarans. Under the terms of the protocol, these daggerboards could not feature trim tabs, could not exceed the beam of the boat when raised and could not be adjusted when lowered, but a loophole exploited by three teams was to create T-shaped rudders and L-shaped daggerboards of which the leeward appendage serves as a hydrofoil on all points of sailing conditions in winds over 10 knots. On September 6, 2012, in Auckland, during Team New Zealand's fifth day of trials, their boat achieved 40 knots (74 km/h) with a level trim and no heeling in 17 knots of breeze.[16]

##### AC45f/AC50

Main article: Engineering:AC50

AC45f sailing on hydrofoils with one daggerboard raised above the water.

The 2015–16 America's Cup World Series was raced with hydrofoiling AC45f catamarans, which are smaller versions of the AC72.

The 2017 America's Cup was raced in the fully foiling AC50 class.

#### F50

The F50 sailboat one design class is adapted from the AC50 class with modifications in new control systems, modular wingsails, and new carbon layer technologies within the foils and hull. The class is used within the SailGP series and is the first sailboat class to break 50.0 knots (57.5 mph/92.6 km/h) during a race, and is claimed that the top speed of the boat is 52.2 knots. The boat also has a variety of rudder foils, board foils, wingssails, and jibs to be used in various combination with a crew of 3-5 people based on the wind speeds There currently exists a total of 8 active boats with teams from the United States, Spain, Japan, France, Denmark, Australia, New Zealand, and Great Britain. In the upcoming 2022–2023 season, two teams from Canada and Switzerland plan to join the competition.[17]

#### C-Class catamarans

Recent International C-class catamaran have been foiling, and further development is expected.[18]

#### A-Class catamarans

International A-class catamaran rule 8 initially allowed hydrofoils, but was changed to partially restrict them in 2009, in response to improving technology. The rule required "that all foils must be inserted from the top of the hull, and that there must be a minimum distance between the tips of the bottom of the boards of 75cm from the centreline".[19] The 2014 A-Class Catamaran World Titles in Takapuna New Zealand demonstrated early foiling capabilities to the class.[20] Now the A-Class can foil stably downwind in 6 knots and upwind in 12 knots or more. Peak speeds are reported to be about 30 knots and 2.5X wind speed.[21] The A-Class has set the standard for 4-point foiling that many classes are now adopting.[22]

#### Nacra 17 catamaran

The Nacra 17 as raced at the 2016 Olympics was capable of elevated foiling under some conditions. For the 2017 World Championships, the Nacra was upgraded to a fully foiling yacht, to be raced at the 2020 Tokyo Olympics.[23]

#### Nacra F20 catamaran

The Nacra F20 is a two-person catamaran similar in design to Nacra Sailing's former 20-foot catamaran and the Nacra 17; however, every component is made of carbon, from the hull, mast, and foils. The Nacra F20 uses 'L' foil daggerboard on each hull and T-shaped rudder foils.

#### Flying Phantom

Main article: Engineering:Flying Phantom (catamaran)

The Flying Phantom is a catamaran similar to the Nacra that uses 'L' foils on each hull and 'T' Foils on the rudders.

#### iFLY15

The iFlY15 sailing on its stabilized four daggerboard hydrofoils.

iFLY15 is a 15-foot hydrofoil catamaran equipped with automatic foils, built by CEC Catamarans GmbH. It uses a mechanical automatic system to stabilize the horizontal trim in the longitudinal and transverse directions. Jibes are facilitated by the four T-shaped foils which are always in the water and stabilize the boat.[24]

#### UFO

Similar in design to a moth, the UFO is a small single person foiling dinghy with a T-foil daggerboard and a T-foil rudder. The boat is made out of fiberglass with carbon rigging and was meant to be user friendly, low cost boat in comparison to the moth or Waszp. Sailing the boat in subpar wind conditions proved to be easier and more enjoyable than a Waszp or Moth as the catamaran hulls provided increased stability.[25]

#### GunBoats G4

The G4 is a junior racer with cruiser content and comfort made by DNA Performance Sailing. The boat design was based on an A-Class Catamaran, containing 'L' foils on each hull and 'T' foils for the rudders and is claimed to reach a top speed of 35 knots. The G4 was designed as a hybrid between racing boats and cruising yachts, capable of foiling or not foiling based on the desires of the user. The Boat was meant to be sailed with 6 people and was capable of housing more. The G4 is no longer in production.[26]

### Trimarans

#### TriFoiler

In the 1990s the Hobie Cat company manufactured the TriFoiler (no longer in production), a twin-sail trimaran with a mainsail on each outrigger capable of 35+ knot speeds in typical sailing conditions, making the TriFoiler the fastest production sailboat in the world. The prototype of the Hobie TriFoiler, called Longshot, was developed by brothers Dan and Greg Ketterman in conjunction with Russell Long. Though more streamlined than the Trifoiler and having smaller hydrofoils, Longshot still holds the Class A speedsailing record of 43.55 knots on a 500-meter course, set in Tarifa Spain in 1993. Until recently, it was the only existing speedsailing record held by a hydrofoil, but the recent records of Hydroptère have added to the list with record breaking runs across the English Channel.[27]

#### WindRider Rave

In 1998, WindRider LLC introduced the WindRider Rave,[28] a popular two-person trimaran hydrofoil capable of lifting off in as little as 12-13 knots of wind. The Rave is capable of sailing between 1.5 and 2 times wind speed.[29] The boat's mainsail has no boom. The Rave broke new ground in the development of flapped foils and control systems.

### Other Wind Craft

#### Wind foiling

Windfoiling otherwise known as Windsurf Foiling are windsurf boards equipped with two T-shaped hydrofoil wings of opposite orientation connected by a fuselauge and a mast inserting into the board. The front wing is larger and provides upwards lift while the rear wing provides stability with downward lift. Many of the hydrofoils used in windfoiling can vary in size in order to obtain a greater combination of lift and top speed. The most recent development in windfoiling was the creation of the IQFoil one design Olympic Windsurfing class by Starboard Windsurfing used to replace the RS in the 2024 Olympics. The IQFoil contains a fully battened, cambered sail alongside a board made of a carbon reflex sandwich design and a carbon and aluminum foil. The class was created in 2020 and is similar to the open windfoiling class used in the PWA(Professional Windsurfing Association) competitions.

#### Foil Kitesurfing

The Formula Kite class was introduced into the 2024 Summer Olympics as a non-one design class. The equipment contains a singly T-shaped foil and a board. A similar setup is also used for recreational foil kitesurfing.[30]

#### Wing Foiling

Wing Foiling is developed from Windfoiling, Foil Kitesurfing, and surfing. It uses a T-shaped foil on a small board in which a person holds an inflatable sail, small in size and similar to a kite, known as a wing.[31]

## Experimental designs

L'hydroptère experimental hydrofoil.

Non-production experimental designs have been built:

* The France experimental Hydroptère set numerous speed records. The boat attained a record speed of 47.6 knots[32] with a goal of breaking the "50 knot barrier" in 2008.[33] On 4 September 2009, l’Hydroptère broke the world speed sailing record, sustaining a speed of 51.36 knots for 500m.[34]
* A Hobie 18 foilcat prototype called Kangalope with foil kits attached.[35]
* Mirabaud LX is a Swiss 1.2 meter hydrofoil boat with traditional hull replaced with centerfloat, supporting spar for foil, sail and crew perch similar to moth sailing boat.[36]
* Rich Miller's hydrofoil sailboard.[37]

## See also

* Hydrofoil board
* Hydroptère
* Hobie TriFoiler
* Wing foiling

## References

1. ↑ "Monitor specs". International Hydrofoil Society. http://www.foils.org/gallery/monitor.htm.
2. ↑ 2.0 2.1 2.2 2.3 "The foiling phenomenon, the history of foils" (in en-US). Yachting World. 2015-07-20. https://www.yachtingworld.com/special-reports/the-foiling-phenomenon-66269. Retrieved 2022-04-23.
3. ↑ "Waszp" (in en-US). https://www.ussailing.org/one-design-profile/waszp/.
4. ↑ "WASZP - the one design foiler" (in en-US). https://waszp.com/.
5. ↑ "The boat – 69F Sailing" (in it-IT). https://69fsailing.com/the-boat/.
6. ↑ "Persico 69F, one-design monohull foiler now in production - Persico Group". https://www.persico.com/en/news-events/news/persico-69f-one-design-monohull-foiler-now-in-production-14609.
7. ↑ Chalmers Univ. of Technology. "The-Optimist dinghy proves it can fly". https://www.chalmers.se/en/news/Pages/The-optimist-dinghy-proves-it-can-fly.aspx.
8. ↑ Chalmers Univ. of Technology. "The Foiling Optimist". https://vimeo.com/213642315.
9. ↑ "How fast can Team New Zealand's AC75 go? Grant Dalton explains the new boat's design". TVNZ. 5 September 2019. https://www.tvnz.co.nz/one-news/sport/other/fast-can-team-new-zealands-ac75-go-grant-dalton-explains-boats-design.
10. ↑ Morgan, Liam (1 November 2019). "World Sailing Council approve Starboard iFoil as windsurfing equipment at Paris 2024". Inside the Games. https://www.insidethegames.biz/articles/1086570/starboard-ifoil-approved-paris-2024. Retrieved 21 August 2020.
11. ↑ "Mālama" (in en-US). https://www.11thhourracingteam.org/about/the-boat-malama/.
12. ↑ "MW40OF - New Foiling Offshore Sailboat Concept". https://www.sail-world.com/news/234298/MW40OF-New-Foiling-Offshore-Sailboat-Concept.
13. ↑ "THE GREAT CUP Organization". http://www.thegreatcup.com.
14. ↑ "Alinghi breaks GC32 speed record!". Alinghi. 20 May 2015. http://www.alinghi.com/news/alinghi-break-gc32-speed-record.
15. ↑ "GC32s to replace Extreme 40s". Extreme Sailing Series. 24 August 2015. http://www.extremesailingseries.com/news/view/gc32s-to-replace-extreme-40s-as-the-extreme-sailing-series-fast-tracks-to-a.
16. ↑ Team NZ's new catamaran in full flight, TVNZ, 2012-09-06, http://tvnz.co.nz/sailing-news/team-nz-s-new-catamaran-in-full-flight-video-5066890
17. ↑ "Switzerland SailGP Team News, Features, Exclusives, Athletes, Stats" (in en). https://sailgp.com/teams/switzerland/.
18. ↑ Foiling 'Little Cup' Cats set for prestigious C-Class Championship Trophy, http://www.yachtsandyachting.com/news/172395/Foiling-Little-Cup-Cats-set
19. ↑ "The 'A' Class Catamaran – Its place at the top table.". https://www.a-cat.org/node/8.
20. ↑ Worlds @Takapuna: Day 1, Report by Bob Griffits, http://www.a-cat.org/?q=node/359
21. ↑ "DNA | HOLLAND COMPOSITES present the 2015 A-Cat Worlds" (in en). https://vimeo.com/139455209.
22. ↑ "Catamaran Racing, News & Design". http://www.catsailingnews.com/search/label/A-Class.
23. ↑ "WHO CAN TAME THE FOILING CAT?". https://www.yachtingnz.org.nz/news/201712/who-can-tame-the-foiling-cat.
24. ↑ "Articles about iFly15". http://www.xssailing.com/category/ifly15/.
25. ↑ "Boat Details" (in en-US). http://www.fulcrumspeedworks.com/UFO/boat-details/.
26. ↑ "G4 Foiling Catamaran - Foiling Multihull" (in en-US). https://dnaperformancesailing.com/our-boats/g4-foiling-catamaran/.
27. ↑ "Hobie TriFoiler History". http://www.hobiecat.com/sailing/history_trifoiler.html.
28. ↑ "WindRider Rave". http://www.windrider.com/rave.shtml.
29. ↑ Burns, Thom (1998). "The Rave Hydrofoil". Sailing Breezes online magazine. http://www.sailingbreezes.com/Sailing_Breezes_Current/advertisers/rave/rave_redefining.htm.
30. ↑ "COMPETE – OLYMPIC FORMAT TESTED FOR 2024". Kitesurfing Magazine. April 8, 2020. https://kitesurfingmag.com/compete-olympic-format-tested-for-2024/.
31. ↑ "The Not-So-Short History of Wing Foiling". Wingsurfing Magazine. Jan 20, 2022. https://wingsurfingmag.com/the-not-so-short-history-of-wing-foiling/.
32. ↑ "Assault on the World Sailing Speed Record". 2008-02-11. http://www.boatweb.com.au/2008/02/11/assault-on-the-world-sailing-speed-record/.
33. ↑ "l'Hydroptère, new version". 2007-12-14. http://www.hydroptere.com/_en/actu_detail.php?id_actu=41#centre.
34. ↑ "L'Hydroptère, monstre de vitesse". L’Équipe. 2009-09-06. https://www.lequipe.fr/Voile/Actualites/L-hydroptere-monstre-de-vitesse/57439.
35. ↑ Carlson, Dave. "Hydrofoil! (Hobie 18 foilcat Kangalope)". http://www.fastsail.com/catcobbler/.
36. ↑ "Mirabaud LX". http://mlxfoiler.wordpress.com/.
37. ↑ "The Miller Hydrofoil Sailboard". International Hydrofoil Society. 2007-09-11. http://www.foils.org/miller.htm.

## External links

* Foils.org gallery of sailing hydrofoils
* Miller Hydrofoil Sailboard \- a hydrofoil windsurfer experiment
* Sailing Cat with Foils
* Aspects of a Foiled Multihull

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