Sail area:
-Main: 21.8 m² / 234.65 ft²
-Jib: 16.9 m² / 181.9 ft²
-Genoa: 22.65 m² / 243.8 ft²
-Spinnaker: 60 m² / 645.8 ft²
Optional engine upgrades:
-Yanmar 2YM15SD
-Lombardini LDW502 saildrive

Sail area:
-Main: 394.6 ft / 36.66 m
-Jib: 246 ft / 22.85 m
-Spinnaker: 1,248.6 ft / 116 m
STL: 18.37 ft / 5.6 m

MKII version of the X4⁹
Displacement above is Lightship.
Shallow keel draft: 2 m / 6.56 ft
Deep keel draft: 2.71 m / 8.89 ft

Shallow keel:
-Draft: 2.18 m / 7.16 ft
-Displacement: 23,500 kg / 51,808 lbs
-Ballast: 6,500 kg / 14,330 lbs

Sail area:
-Main (standard): 91 m² / 979 ft²
-Main (furling): 81 m² / 872 ft²
-Jib: 60 m² / 646 ft²
-Reacher: 112 m² / 1,205 ft²
-Gennaker: 235 m² / 2,529 ft²

Interior design: Ardizio Design
Shallow draft keel: 1.75 m / 5.9 ft
Displacement reported above is Light Ship.
Sail area:
-Main: 64 m² / 209.97 ft²
-Genoa: 52 m² / 170.6 ft²

Deck and interior design: Nauta Design
“Race” version has an extended bowsprit. LOA: 17.95 m / 58.11 ft
Optional 80 hp engine
Optional keels draft: 2.3 m / 7.7 ft or 2.7 m / 8.1 ft
Sail area:
-Main: 95 m² / 1,023 ft²
-Main: (race): 100 m² / 1,076 ft²
-Self-tacking jib: 62 m² /667 ft²
-Self-tacking jib (Race): 65 m² / 700 ft²
-Gennaker: 250 m² / 3,014 ft²
-Gennaker (Race): 280 m² / 2,691 ft²

Shoal keel draft: 5.9 ft / 1.8 m

Sail area:
-Main: 49.6 m² / 533.9 ft²
-Jib (100%): 40.0 m² / 430.56 ft²
Additional keel options draft:
-Wing keel: 1.65 m / 5.4 ft
-Fin keel: 2.5 m / 8.2 ft

Wing keel draft: 5 ft / 1.52 m
A 1997 brochure reports:
Fin keel displacement: 19,700 lbs./ 8,935.77 kg
Wing keel:
-Draft: 5.5 ft/ 1.68 m
-Displacement: 20,500 lbs / 9,298.64 kg
-Ballast: 8,000 lbs / 3,678.24 kg

Shallow keel draft: 1.65 m / 5.42 ft.
Shallow keel displacement: 8,010 kg / 17,659 lbs.
Optional diesel engine: 39 hp.
Optional electric motor: 25 kW (34 hp equivalent)
Sail area:
-Standard main: 35 m² / 365.97 ft²
-Performance main: 40 m² /430.55 ft²
-Furling main: 33 m² / 355.21 ft²
-Self-tacking jib: 26 m² / 279.86 ft²
-Genoa: 32 m² / 344.44 ft²
-Crossover: 68 m² / 731.94 ft²
-Gennaker: 103 m² / 1,108.68 ft²