One Design · Multihull

Formula 18 parts, rigging and specifications

Also known as: F18

The Formula 18 is a multihull one-design class designed by Olivier Bovyn and Pierre-Charles Barraud (1993), with a published length overall of 18 ft 1 in (5.52 m). MAURIPRO lists 8 parts for the Formula 18 below, grouped by system, with live prices and stock.

Multihull
8 parts
10 published figures

Your Formula 18 at MAURIPRO

What you can do on this page.

01Shop parts by system8 parts for the Formula 18, matched by part number and grouped by system.Shop all parts →

02Check the specifications10 published figures, each with its source.See specifications →

03Tuning guides3 published guides for this class.See the list →

04Get expert helpNot sure a part fits your Formula 18? Send us your sail number and year.Contact us →

Formula 18 parts

Prices and stock are live from our catalogue.

Harken Block - 16mm Single
Harken · SKU HAR404 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Swivel Cam Cleat - Base (Standard) w/ Bullseye & Cam-Matic 150 - Line: 1/8 to 1/2 in (3 to 12 mm)
Harken · SKU HAR240 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Block - 16mm Single - Cheek
Harken · SKU HAR416 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Block - Carbo 29mm Single - Pivoting / 471 Carbo-Cam
Harken · SKU HAR396 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Block - Carbo Ratchamatic 57mm Single - Swivel / Standard Grip (Black)
Harken · SKU HAR2625 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Block - Carbo T2 29mm Single
Harken · SKU HAR2146 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Block - Carbo T2 40mm Single
Harken · SKU HAR2149 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System
Harken Block - Fly Block 18mm Single
Harken · SKU HAR2698 · On Harken layout: Crossbow Pivoting Self-Tacking Jib System

Harken part numbers cross-checked against Harken's published one-design deck layout for the Formula 18 (checked 2026-11-04).

Formula 18 specifications

Specification	Published figure	Source
Length overall (LOA)Rule D.2 Dimensions - Hull length, maximum	5520 mm (18 ft 1 in)	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
BeamRule D.2 Dimensions - Boat beam, maximum	2600 mm (8 ft 6 in)	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
Sailing weight (all up)Max 7 kg corrector weight	The weight of the boat shall not be less than 180 kg. (397 lb)	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
Mainsail area	17.00 m² (183 sq ft)	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved; matches Harken one-design deck layout page, Compiled from published sources (f18.fr, ussailing.org, media.sailing.org)
Jib areaRule G.4.3 jib sail area, maximum	4.30 m² (46 sq ft)	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
Spinnaker / gennaker areaRule G.5 gennaker sail area, maximum	21.00 m² (226 sq ft)	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
Mast length	9 m (29 ft 10 in)	Compiled from published sources (f18.fr, ussailing.org, media.sailing.org); matches Harken one-design deck layout page
CrewRule C.3.2	The crew shall consist of 2 persons.	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
Designer	Olivier Bovyn and Pierre-Charles Barraud	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved
First built / designedFormula developed 1993	1993	International Formula 18 Class Association / World Sailing - International Formula 18 Class Rules 2026, Effective date 2026-March-1, Status: Approved

Figures are shown as each source publishes them, with the other unit converted. Class rules set the measurements that count for racing.

Formula 18 tuning guides

AHPC (Capricorn builder): Capricorn F-18 Tuning GuideVersion 2007 · 4 pages
Hobie (Mischa Heemskerk): Tuning Guide for the Wild Cat from Mischa HeemskerkVersion 2010 · 2 pages
Hobie (Mitch Booth): Hobie Tiger Tuning Guide – 2006 EditionVersion 2006 · 4 pages

Tuning guides belong to the sailmakers that publish them. MAURIPRO does not host or reproduce them; ask the sailmaker or your class association for a copy.

Formula 18 class rules and references

Class rules: International Formula 18 Class Rules 2026, effective 1 March 2026 (World Sailing); the class site's revision history lists the 2025 Class Rules v.02 (effective 1 Jan 2025) at https://www.f18-international.org/wp-content/uploads/2024/12/F18_CR_2025-01Jan-01-v.02.pdf
Class association: f18-international.org
Builder: nacrasailing.com

References checked 2026-11-04.

Formula 18 buying questions

What Formula 18 parts does MAURIPRO carry?

8 products are listed for the Formula 18 on this page: blocks & sheaves (7); cleats, clutches & fairleads (1). Prices and availability shown are live from our catalogue.

How do I know a part fits my Formula 18?

Each part here is linked to the Formula 18 because its exact manufacturer part number appears on the Formula 18 parts lists we reviewed (including Harken's published one-design deck layout for this class). Fit can still depend on your boat's year, builder and rig, so check the product details and your class rules, or ask our technical team before you order.

Are there tuning guides for the Formula 18?

Sailmakers have published tuning guides for this class, including AHPC (Capricorn builder) (Capricorn F-18 Tuning Guide, PDF (file dated 20 Nov 2007; hosted by F18 France, uploaded Feb 2021)); Hobie (Mischa Heemskerk) (Tuning Guide for the Wild Cat from Mischa Heemskerk, PDF (file dated 26 Aug 2010; hosted by US Sailing)); Hobie (Mitch Booth) (Hobie Tiger Tuning Guide – 2006 Edition, 2006 edition, 15 March 2006 (hosted by US Sailing)). These guides belong to their publishers; MAURIPRO does not host or reproduce them, so please get them from the sailmaker or your class association.

Which rules govern the Formula 18?

The class is governed by its class rules (International Formula 18 Class Rules 2026, effective 1 March 2026 (World Sailing); the class site's revision history lists the 2025 Class Rules v.02 (effective 1 Jan 2025) at https://www.f18-international.org/wp-content/uploads/2024/12/F18_CR_2025-01Jan-01-v.02.pdf). Check the current edition with the class association before buying parts for racing.

Not sure which part fits your Formula 18?Send us your sail number, year and builder and our team will check it.