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Cosmos 1100

 Home-built from plans or kit

Designed by:
Schionning Designs
Schionning Cosmos 1100 COSMIC DRIFT

The Cosmos 1100 is a performance cruiser, big enough for any ocean voyage, yet small enough to be very easily handled with a crew of two. With her light, slim hulls she can sail fast, and strip planked in cedar or Durakore, she is a viable project for home builders.

The most popular layout for the new design [in 2004] will probably be the three cabin configuration, with two double cabins forward on the bridgedeck and one double cabin aft in the starboard hull. Additional single bunks can be fitted into the bows.

The saloon has all round vision with opening hatches forward for good ventilation.

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)
  • Balsa cored bulkheads
  • Sealed with epoxy resin and glass
  • Composite forward beam with striker
Sails and rigging:
  • Fractional sloop rig
  • Fully battened main
  • Fixed or rotating mast
  • Roller furling genoa
  • Asymmetric spinnaker flown from the bowsprit
Sails and rigging images:
Schionning Cosmos 1100 SLOW RUSH Schionning Cosmos 1100
Deck layout and gear:
  • Flat decks with non-slip surface
  • Targa bar carries solar panels and aerials, and lifts and carries a dinghy
  • Wheel steering
  • Aft anchoring setup
  • Main sheet traveller track on the cockpit seatback
Keels, boards and rudders:
  • Kick-up rudders mounted in the bottom step of the transoms
  • Daggerboards
Port hull: Head and shower compartment aft; navigation area midships; double berth forward; optional single berth in the bow
Bridgedeck cabin: Saloon with dinette
Starboard hull: Double cabin aft; galley midships; double berth forward; optional single berth in the bow
Accommodation images:
Schionning Cosmos 1100 SLOW RUSH Schionning Cosmos 1100 SLOW RUSH Schionning Cosmos 1100 SLOW RUSH
Systems - Power, Navigation:
Two 9.9 HP outboards mounted in wells in the transoms - retractable
Performance and handling:
  • Simple handling with centralised controls for steering, sails and motor
  • Fast, light cruiser
  • Easily driven hulls with 12:1 length: beam ratio
  • 6 kts cruise, 8.5 kts top speed with the motor
  • 8 - 12 kts cruise, 20 kts top speed under sail
LOA (length overall):
11 m (36 ft 1 in)
6.6 m (21 ft 8 in)
Hull length-to-beam ratio:
Draft minimum:
0.46 m (1 ft 6 in)
Windward sail area:
75.0 m² (807 ft²)
Mast height above deck:
15 m (49 ft 3 in)
Daggerboard / centreboard:
Displacement, lightship (empty):
2900 kg (2.85 tons)
Displacement at design waterline (DWL):
3900 kg (3.84 tons)
1000 kg (0.98 tons)
Bridgedeck clearance:
0.65 m (2 ft 2 in)
Number of berths:
Cabin headroom:
1.9 m (6 ft 3 in)
Saloon headroom - cats:
1.85 m (6 ft 1 in)
Outboard engines:
Typical total engine HP:
Fuel type:
Fuel capacity:
100 lt (26 US gallons)
Water capacity:
400 lt (106 US gallons)
In production:
Plans available
More images:
Schionning Cosmos 1100 SLOW RUSH Schionning Cosmos 1100 SLOW RUSH Schionning Cosmos 1100 SLOW RUSH Schionning Cosmos 1100 COSMIC DRIFT Schionning Cosmos 1100 COSMIC DRIFT
Degree of customisation:
Several options
Cost to home-build:
$120000 AUS (approx: £53205 Sterling / 71882 / $105546 US)*
Time to home-build from plans:
4500 hours
Time to home-build from kit:
3800 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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