x yachts x79

Sailboat specifications

• Last update: 3rd April 2020

X-79's main features

X-79's main dimensions, x-79's rig and sails, x-79's performances, x-79's auxiliary engine, x-79's accommodations and layout, x-79's saloon.

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• Sailboat Guide

X-79 is a 26 ′ 1 ″ / 8 m monohull sailboat designed by Niels Jeppesen and built by X-Yachts between 1979 and 1994.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

The X-79 was the first boat built by X-Yachts. Thanks to Paul Keller for providing updated information.

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X-79 6 Pages

Catalog excerpts

The interior of the X-79 is functional, light, and pleasant. The materials used here are e.g. maha-gony, cork, linen, horsecloth, and structure coat. At the table in the cabin there are seating for 4-6 persons. The quarter berths are deap and comfortable with a length of 1,95 m. In standard version the forward cabin can easily be used for sails and gear - maritime and suitable. As extra equipment a large double berth with room for chemical toilet can be mounted. During the Off-shore races the shelves are used as pilot berths. The combined chart table/galley can easily be operated while...

The X-79 is a sandwich construction of fibre glass laid-up by hand. Characteristic for the X-79 is the quality of finish. The cockpit is worked out providing optimum seating comfort at the 2 m long benches as well as on the side decks. The long mainsail cross haul secures a precise and easily operated mainsail trim. All halyards and reefs are led to the winch at the hatch garage so that it can be operated either from windward, leeward, or standing on the double step in the companion way. The X-79 design has practically become leading for modern designs of the eighties. An increasing number...

During the recent years X-79 has gained a footing as a very exciting racer class. "DA NSK X-79 KLUB" is every year together with "INTERNATIONAL X SEVENTY-NINE ASSOCIATION" (IXSNA) arranging large races with participation of 30-40 boats, e.g. the races "SKANDINAVISK MESTERSKAB" and "DS-KLASSEM ESTER-SKA B" etc. X-79 has since her start every year been in the lead of the world's largest race "SJ/ELLAND RUNDT" in easy weather as well as hard weather. One of the most success-full match-racing finals in Denmark was held by using the X-79 in extremely hard weather (wind force 22 m/s) where...

Niels Jeppesen Modern Yacht Design

All X-Yachts catalogs and brochures

8 Pages

12 Pages

21 Pages

23 Pages

25 Pages

27 Pages

7 Pages

16 Pages

20 Pages

49 Pages

24 Pages

19 Pages

17 Pages

6 Pages

4 Pages

15 Pages

2 Pages

28 Pages

11 Pages

52 Pages

40 Pages

32 Pages

Archived catalogs

31 Pages

29 Pages

132 Pages

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X-yachts X-79 resources

• Assembly/build manual
• German X79 Class association rules from 2002 (In English, source: x79.de)
• Some commercial brochures: first second
• X-79 specification february 1991
• Sample polar diagram .

Trim guides

• The most comprehensive trim guide ( local copy ) I've found is the one from North Sails in Denmark. (in Danish)
• Quantum Sails has a section (in Danish) as well, but more brief. ( local copy )
• Original (?) typewritten trim guide from Nils Jeppesen In German, from x79.de
• SWE-67 pages (in swedish)
• Danish X-79 club
• X-79 on Danish wikipedia
• North Sails recommended X-79 sails (dead as of 2018-05-18)
• X-79 on sailboatdata.com

Mirror this site!

Much content is originally mirrored from www.x79.dk . As of December 2015 x79.dk is dead, and the swedish x79.nu is also offline now. Yachts last longer than web sites! Please fetch a full copy (or a git clone ) of the content and make it available for future X79 owners.

Last updated 2018-05-18 by Lasse Karstensen.

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X-Yachts and YANMAR are Keeping the Danish Tradition for Boat Building Alive

Historically, the Danish people are well known for their sailing prowess and talent for boatbuilding. In the southern Jutland town of Haderslev, X-Yachts and Yanmar are helping keep this tradition very much alive.

“We are surrounded by so much water and therefore have a strong history of sailing,” says Kræn Brinck Nielsen, CEO of X-Yachts. Kræn grew up sailing dingies and excelled enough to represent his country. Later, he was offered his dream job at the helm of this local shipyard that has built its reputation as the best in performance yacht design and construction.

“It was an easy choice – I’ve known this company since I was eight years old and have sailed X-Yachts my whole career,” he adds. “Having something you are passionate about in your backyard was almost too good to be true.”

Wednesday 19th January 2022

The restart of the X-79!

It all started 43 years ago, when the X-79 spread her wings, flew away and laid the foundation of X-Yachts. The X-79 was a successful Northern European one-design class, that is still active in a few countries.

Together with X-Yachts CEO Kræn Nielsen, Jens Hedegaard from Kolding wants to restart the Danish X-79 club, with the goal to have their own class at the Palby Fyn Cup in Denmark.

At the first club meeting, at the yard in Haderslev, Kræn Nielsen, together with Birger Hansen, welcomed 34 enthusiastic X-79 sailors, including a handful of X-Yachts employees.

At the meeting, it was possible to have a look at the very first X-79, which Birger Hansen have spent the last 3 years refurbishing.

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X-YACHTS X-79 THE ORIGINAL YACHT MODEL THAT STARTED X-YACHTS 43!  

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