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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The 40th anniversary of X-Yachts - The launch of the X-79
Thursday 3rd October 2019
X-Yachts as a start-up company in 1979
To celebrate the 40th Anniversary of X-Yachts, a number of upcoming stories will give you an insight behind the scenes of how the foundation of X-Yachts was made.
These stories will take you through a journey of a company, which is built on passion, innovation and the hunger to create the eXtraordinary.
#3 Their own project After the launch of Ravage 36, Lars, Niels, and Birger discussed whether they should “own” their own project.
Before a conclusion was made, Lars, who has just finished his education as boat builder, realizes an old dream of taking a three-month long journey around the Mediterranean with a friend.
How it all began Niels and Birger, however, could not wait three months. On 10 th February 1979, Niels Jeppesen finalised the drawings for a light racing-orientated sailboat 7.8 metres in length. Niels and Birger started building the plug. After all, it would be quite amusing to have it ready when the newly educated boat builder returned from his Mediterranean wanderings.
Along the way, the plug was extended by 10 centimeters. After all, when the boat was 7.9 meters long, the name was self-evident. It had to be something with the number 79 – made in 1979. As they failed to agree on the rest of the name, they gave it an interim denominator, X, representing the unknown.
More to come – stay tuned! The 40th Anniversary paper book is now for sale – Read all about the X-Yacht journey – 150 pages of history, models and pure X-moments. Click to order
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The X 79 is a 26.12ft fractional sloop designed by Niels Jeppesen and built in fiberglass by X-Yachts between 1979 and 1994.
468 units have been built..
The X 79 is a light sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.
X 79 for sale elsewhere on the web:
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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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The refurbishing process of X-79 number 1. In the early Summer of 2018, Birger Hansen and Lars Jeppesen picked up the very first model of X-79 on Jersey in the UK. The boat was a gift to X-Yachts Headquarters from the UK Dealer of X-Yachts, Conor Fanning. During the Autumn of 2018, the refurbishing process of the exterior was started up by ...
X-79: X-Yachts Owners Association: Download Boat Record: Notes. The X-79 was the first boat built by X-Yachts. Thanks to Paul Keller for providing updated information
The X-79 is a 26’1” (7.96m) racer-cruiser sailboat designed by Niels Jeppesen (Denmark). She was built between 1979 and 1994 by X-Yachts (Denmark) with 468 hulls completed. X-79's main features
The first x-79 was sold As soon as the boats were in the harbor, the two parties rushed up to find a piece of paper, and drew up a hand-written contract. The first X-79 ever built was sold. The three boat builders from Haderslev went back home without a boat. Watch the founders step on board the first X-79 40 years after the launch
An X-79 won what was then the biggest yacht race in the world, the Sjælland Rundt, with almost 2,100 yachts competing. The X-79 went on to become a one-design class with almost 500 boats built throughout the 190s. In 1981 the X-102 was designed to race under the Three-Quarter-tonner Rule.
The X 79 is a 26.12ft fractional sloop designed by Niels Jeppesen and built in fiberglass by X-Yachts between 1979 and 1994. 468 units have been built. The X 79 is a light sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.
X-79 is a 26′ 1″ / 8 m monohull sailboat designed by Niels Jeppesen and built by X-Yachts between 1979 and 1994. Great choice! Your favorites are temporarily saved for this session.
X-Yachts: Boat; Draft: 1.37 m (4.5 ft) Hull; LOA: 7.93 m (26.0 ft) LWL: 6.40 m (21.0 ft) Beam: 2.88 m (9.4 ft) Rig [edit on Wikidata] X-79 is a 7.93-metre ...
In 1979 she spread her wings, flew away and laid the foundation of X-Yachts.The 3 founders of X-Yachts, Birger Hansen and Niels & Lars Jeppesen have test sai...