Carbon rig

CUL-Masten develops and produces masts made of carbon (carbon fiber, carbon) for yachts and sailboats, both for recreational sailors and the ambitious regatta sailor. The carbon masts are completely designed and manufactured in Germany. Due to the enormous advantages of carbon fiber in weight, strength and restoring force, we manufacture our masts exclusively in carbon. Most fittings and add-on parts are also made from this high-tech material.

Laminate structure

Our production technology enables us to build the laminate individually. The fiber course is specially adapted to the mast. Only high-quality fibers from renowned manufacturers are used. We attach particular importance to high tensile strength and elongation at break. To achieve an outstanding result, it is possible to combine different fibers. We use a high quality epoxy resin, also used in aviation, with GL certified hardener, which has a temperature resistance of over 100°. The carbon fiber mast is usually reinforced up to the main boom especially, to absorb the corresponding forces. The laminate thickness is continuously reduced from the bottom to the top, giving the mast a much lower center of gravity, which significantly improves the sailing performance.

Mast groove, rail, slider...

A special advantage of the CUL carbon masts is the mast groove integrated into the mold. This is incorporated directly into the laminate and saves weight. The shaping results in a V-shaped, inwardly incorporated base for the mast groove and forms a beam as reinforcement. The longitudinal axis receives increased strength compared to an attached rail system and saves costs.

The integrated mast groove guides the mainsail - whether directly with the keder on the sail, with composite mast groove sliders, battened slider systems from Rutgerson, Luffshuttle or the Ballslide™ system from Ronstan. In addition, depending on the customer's requirements, we have the option of placing a conventional track system from (e.g. Harken, Ronstan, Kaver) and attaching it with sliding blocks in the mast groove without weakening the mast with holes. If the mainsail system is changed, the conversion is possible at any time.

More detailed information under Technology!


From mast base to top

Mast groove

  • directly incorporated into the carbon profile
  • up to 20% higher strength in the longitudinal axis
  • significantly lower weight than with external rail system
  • Mainsail system changeable at any time
  • one system-all possibilities

More detailed information under Technology!

Mast base

  • mast base possible in a wide range of variations
  • made of carbon, stainless steel or aluminum
  • on deck or on the keel
  • with fastening of halyard swivels
  • with deck feed through
  • with hydraulics
  • individual adjustment according to customer requirements

Downhaul fitting

  • full carbon sleeve
  • bonded over the entire surface with optimum force transmission
  • reinforced area for the bolt to prevent the ace hammering
  • stainless steel bolt and receptacle

Boom lout fitting

  • full carbon sleeve
  • bonded over the entire surface with optimum force transmission
  • reinforced area for the bolt to prevent deflection
  • stainless steel bolt with shackle for mainsail neck and eyes for reefing system
  • optional hook or snapper possible
  • individual adjustment possible

Case leaks

  • completely edged to prevent friction between halyards and carbon fiber
  • stainless steel

Spinnaker pole fitting

  • high strength stainless steel
  • adapted to the mast profile
  • also possible with rail for adjustment

Salings fitting

  • full carbon reinforcement
  • fully bonded for force application
  • saling simple and easy to remove (e.g. for winter storage)
  • stainless steel salings receptacle
  • reinforced for terminal fastening of the shrouds


  • carbon salings from aerodynamically shaped profiles
  • in different sizes, depending on the mast profile size and application
  • easily removable
  • tight and secure fit
  • material thickness and fiber angle adapted to load

Saling end fittings

  • cast carbon fiber reinforced end fittings in different variants
  • for continuous or discontinuous rigging
  • high strength
  • light
  • removable

Forestay reinforcement

  • full carbon reinforcement to accommodate shrouds, roller boxes and forestay fitting
  • shroud suspension and backstays through terminals or with bolts
  • with jib halyard guide for winding system
  • with separate roller box for winding unit

Forestay fitting

  • optimal force application
  • with up to 3 drop discs
  • roller box can be dismantled for maintenance work
  • in combination with jumper or diamond, depending on the assembly

 Variations according to requirements:

  • without drop discs
  • with 2 or 3 drop discs
  • in carbon superlight or stainless steel possible

Roller boxes

  • made of carbon or stainless steel
  • 1, 2 or 3 drop targets
  • easy running and resilient drop discs
  • easy to dismantle and therefore easy maintenance of the traps

Tapered top

  • top area rejuvenation is possible upon customer request
  • less aerodynamic resistance
  • appealing design
  • less top weight

Top fitting

  • completely made of carbon fiber
  • easy to dismantle thanks to special fastening
  • easy maintenance of the traps
  • in different variations, depending on customer requirements
  • with easy running halyards for mainsail and depending on the application for topspinnaker, genoa, code 0
  • also possible with reduction for case
  • with optional bracket for wind measuring system and top light
  • perfect load transmission
  • wide delivery of the backstay
  • attachment of backstay whip possible for greater sail rounding
  • alternatively also for double back-to-back
CUL-Masten Topbeschlag mit Galgen und Halterung für Windmessanlage
CUL-Masten Topbeschalg mit Fallscheiben für Großsegel und Code0

More details...

Profile sizes

With the help of our wide range of mast profiles, we can manufacture carbon masts for boats and yachts up to a size of about 45 feet. The small profiles are suitable for dinghies, dinghy cruisers, sport boats and daysailers. By individually designing the wall thickness, the profiles can be optimally adapted to the requirements of the boats. We also reduce the wall thickness from the base of the mast to the top in order to save weight in the less stressed upper area of the mast and to bring the center of gravity of the mast further down. Also the tapering of the mast top for perfect optics and weight reduction can be realized.

  Profile size Dimensions Weight Ixx Iyy
104er Profil 104 x 67 mm 1,0 kg/m 39 cm⁴ 85 cm⁴
105er Profil 106 x 67 mm 1,2 kg/m 40 cm⁴ 100 cm⁴
106er Profil 106 x 69 mm 1,4 kg/m 57 cm⁴ 117 cm⁴
110er Profil 110 x 70 mm 1,1 kg/m 47 cm⁴ 104 cm⁴
111er Profil 112 x 71 mm 1,4 kg/m 58 cm⁴ 131 cm⁴
112er Profil 112 x 72 mm 1,5 kg/m 68 cm⁴ 141 cm⁴
117er Profil 117 x 78 mm 1,2 kg/m 62 cm⁴ 132 cm⁴
118er Profil 118 x 79 mm 1,5 kg/m 76 cm⁴ 157 cm⁴
120er Profil 120 x 79 mm 1,7 kg/m 78 cm⁴ 191 cm⁴
140er Profil 140 x 88 mm 1,7 kg/m 130 cm⁴ 312 cm⁴
141er Profil 142 x 88 mm 2,0 kg/m 132 cm⁴ 366 cm⁴
142er Profil 142 x 90 mm 2,4 kg/m 176 cm⁴ 426 cm⁴
168er Profil 168 x 108 mm 2,1 kg/m 226 cm⁴ 603 cm⁴
170er Profil 170 x 109 mm 2,5 kg/m 266 cm⁴ 738 cm⁴
172er Profil 172 x 111 mm 3,1 kg/m 348 cm⁴ 895 cm⁴
197er Profil 197 x 110 mm 3,0kg/m 370 cm⁴ 1069 cm⁴
199er Profil 199 x 110 mm 3,2 kg/m 375 cm⁴ 1220 cm⁴
200er Profil 200 x 112 mm 3,7 kg/m 475 cm⁴ 1429 cm⁴
218er Profil 218 x 113 mm 3,3 kg/m 421 cm⁴ 1354 cm⁴
220er Profil 220 x 115 mm 4,1 kg/m 536 cm⁴ 1684 cm⁴
222er Profil 222 x 115 mm 4,4 kg/m 550 cm⁴ 1944 cm⁴

Send us a request!

We will be happy to make you an offer and answer your questions!

Tel. +49 881 92774244

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