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Cosmos 1250S

 Home-built from plans or kit

Designed by:
Schionning Designs
Schionning Cosmos 1250S

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 can 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 1250S has four double cabins (Schionnings of this length usually have three doubles), a large galley and extra seating in the cockpit. The rig is moderately sized, with the emphasis on simplicity of handling. Daggerboards are standard for good windward performance, though because she is heavier, it is not as good as the slimmer and lighter 1250 standard version's.

This model is only built in Durakore, unlike the standard models, which may also be built in cedar.

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 Durakore
  • 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
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
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
Systems - Power, Navigation:
2 inboard diesels
Performance and handling:
  • Simple handling with centralised controls for steering, sails and motor
  • Fast cruiser with good payload
  • Easily driven hulls with 11.7:1 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:
0.54 m (1 ft 9 in)
Windward sail area:
95.0 m² (1023 ft²)
Mast height above deck:
17 m (55 ft 9 in)
Daggerboard / centreboard:
Displacement, lightship (empty):
4500 kg (4.43 tons)
Displacement at design waterline (DWL):
7000 kg (6.89 tons)
2500 kg (2.46 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
Degree of customisation:
Several options
Cost to home-build:
$200000 AUS (approx: £88675 Sterling / 119803 / $175910 US)*
Time to home-build from plans:
6300 hours
Time to home-build from kit:
5000 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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