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Cosmos 1250

 Home-built from plans or kit

Designed by:
Schionning Designs
Schionning Cosmos 1250 POWER ZONE

The Cosmos 1250 is a performance cruising catamaran designed mainly for charter and is available in two versions, the 1250S, that complies with the Australian Survey Standards, and the 1250 that does not. With commercial operation in mind, the 1250S an be operated in Austrailian waters with a Coxswains certificate, she has more beam than the 1250 and has a payload of 2.5 tons which is 0.7 tons more than the 1250. The standard Cosmos 1250 is suited to long-term ocean cruising or liveaboard. She carries an adequate cruising payload, though less than the 1250S, and with her slim hulls and light displacement, sails excellently.

Reflecting her original purpose as a charter boat, the 1250 has four double cabins (Schionnings of this length usually have three doubles), a large galley and extra seating in the cockpit. Other configurations below decks are possible, however.

The rig is moderately sized, with the emphasis on simplicity of handling, though it will drive the boat easily as long as she is not overloaded. Daggerboards are standard for good windward performance and a composite rotating mast can be substituted (at extra cost) to improve her sailing ability further.

Building the Cosmos range
Plans for the Cosmos range of performance cruising catamarans are available for home builders and professional boat yards. The boats are strip planked in either Durakore (manufactured compound planks with a balsa wood core) or Western Red Cedar. With this method of construction the compound curves of the hulls and decks can be relatively easily accurately formed and building requires only a moderate level of skill and no complex or expensive tools. The result is a sleek looking, strong and light boat. Western Red Cedar is cheaper and a little easier to use but Durakore planking is about 30% lighter because of the significant weight saving in the core. The construction with Durakore gives a very high strength to weight ratio and will produces a lighter boat allowing either a little more performance perhaps for club racing, or a better payload for cruising.

Hulls are built separately upside down on temporary building frames. After being planked, the hulls are sealed with epoxy resin and glass, then turned by hand for sealing inside.

Performance cruiser
Multihull type:
  • Strip planked in Western Red Cedar (cheaper and easier), or Durakore (lighter)
  • Hulls and decks sealed with epoxy resin and glass
  • Duflex, balsa cored bulkheads
  • Duflex, honeycomb and balsa panels used for furniture
  • Composite forward beam with striker
Sails and rigging:
  • Fractional sloop rig
  • Fully battened main
  • Fixed or rotating mast (optional)
  • Roller furling genoa
  • Asymmetric spinnaker flown from the bowsprit
Sails and rigging images:
Schionning Cosmos 1250 POWER ZONE
Deck layout and gear:
  • Flat decks with non-slip surface
  • Targa bar carries solar panels and aerials, can lift and carries a dinghy
  • Wheel steering
  • Hardtop bimini
Deck layout images:
Schionning Cosmos 1250 Schionning Cosmos 1250
Keels, boards and rudders:
  • Kick-up rudders mounted in the bottom step of the transoms
  • Daggerboards - offset in the hulls to give more accommodation space
Port hull: Double cabin aft; head and shower midships; double berth forward; single berth in the bow
Bridgedeck cabin: Saloon with 360 degree view; dinette; navigation area
Starboard hull: Head and shower compartment aft; galley midships; double berth forward; head and shower in the bow
Accommodation images:
Schionning Cosmos 1250
Systems - Power, Navigation:
  • Two 20 HP 4 stroke outboards mounted under the cockpit
  • Option of 2x diesels
Performance and handling:
  • Simple handling with centralised controls for steering, sails and motor
  • Fast, light cruiser
  • Easily driven hulls with 12.2:1 length: beam ratio
  • 6.5 kts cruise, 10 kts top speed with the motor
  • 10 kts cruise, 20+ kts top speed under sail
LOA (length overall):
12.5 m (41 ft)
6.9 m (22 ft 8 in)
Hull length-to-beam ratio:
Draft minimum:
0.46 m (1 ft 6 in)
Windward sail area:
95.0 m² (1023 ft²)
Mast height above deck:
17 m (55 ft 9 in)
Daggerboard / centreboard:
Displacement, lightship (empty):
3830 kg (3.77 tons)
Displacement at design waterline (DWL):
5630 kg (5.54 tons)
1800 kg (1.77 tons)
Bridgedeck clearance:
0.7 m (2 ft 4 in)
Number of berths:
8 - 9
Cabin headroom:
2.2 m (7 ft 3 in)
Saloon headroom - cats:
1.8 m (5 ft 11 in)
Outboard engines:
Typical total engine HP:
Fuel type:
Fuel capacity:
100 lt (26 US gallons)
Water capacity:
600 lt (159 US gallons)
In production:
Plans available
More images:
Schionning Cosmos 1250 SANITY Schionning Cosmos 1250 POWER ZONE Schionning Cosmos 1250 POWER ZONE Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 Schionning Cosmos 1250 POWER ZONE Schionning Cosmos 1250 POWER ZONE
Degree of customisation:
Several options
Cost to home-build:
$180000 AUS (approx: £79807 Sterling / 107823 / $158319 US)*
Time to home-build from plans:
6000 hours
Time to home-build from kit:
4800 hours
Designer's/manufacturer's website:
Used boats for sale:
24 boats of this brand currently available!

* Exchange rates last updated: Sunday 27th January 2008 19:27 GMT

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