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Sailboat specifications and datasheets

X-79

The X-79 is a 26’1” monohull sailboat designed by Niels Jeppesen. She was built by X-Yachts (Denmark) and made of sandwich fiberglass / polyester. This sailboat was produced between 1979 and 1994 with 468 hulls completed.
X-Yachts X-79 X-Yachts X-79 layoutX-Yachts X-79 sailingX-Yachts X-79 sailingX-Yachts X-79 sailingX-Yachts X-79 sailingX-Yachts X-79 accommodationsX-Yachts X-79 accommodations
X-79's   Main Features
Model X-79
Type of hull Monohull
Category Racer-cruiser sailboat
Shipyard
Designer Niels Jeppesen
Construction Hull and deck:
sandwich fiberglass / polyester
First built hull 1979
Last built hull 1994
Number of hulls built 468
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
X-79's   Main dimensions
Hull length 26’ 1”
Waterline length 21’
Beam (width) 9’ 5”
Draft 4’ 5”
Light displacement 2965 lbs
Ballast weight 1477 lbs
X-79's   Rig and sails
Upwind sail area 419 sq.ft
Downwind sail area 800 sq.ft
Mainsail area 219 sq.ft
Genoa area 200 sq.ft
Solent area 135 sq.ft
Stormjib area 54 sq.ft
Symetric spinnaker area 581 sq.ft
Rigging type Sloop Marconi 3/4
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle 0 °
X-79's   Performances
Upwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.
The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat.
31.93
Downwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.
The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat.
60.98
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
145
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
50 %
Hull speediAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
6.14 knots
X-79's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Engine (min/max) 3 HP / 6 HP
Fuel type Gas
X-79's   Accommodation
Berth(s) (min/max) 4 / 6
X-79's   Saloon
Berth length 6’ 5”

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