Senggigi 12.5


The Senggigi 12.5 design is the second design in a series of new performance cruising catamaran designs.
The hull shape and build process features a continual transition from hull to deck and a soft flare in the hull. Construction can be in Strip Plank WRC or Foam Sandwich but in either case the hulls are built up to WL1000 with the deck section built separately and fibreglassed on the inside only before being positioned on the boat.
The layout options can be varied between the main bulkheads. The “standard” layout has 2 main cabins forward with beds on the underwing with another cabin and large bathroom aft. The galley is in the hull but not closed off, allowing for a large living area for in the saloon. The other galley option is up in the saloon, next to the settee. There are 4 large hatches on the cabin front and a wide companionway in the cabin bulkhead.

The forward cabins are designed with the option of one bed fore and aft and the other athwartships. This gives the option of sleeping in either orientation but still allows for a large fuel and anchor locker between the berths and forward of the mast. It also means that the athwartships bed has some room either side and is not in a narrow, coffin like space. Actually in this bed it would be possible to sleep in either orientation. Having the fuel and anchor just forward of the mast in the large deck lockers between the cabins keeps the weight central and reduces the hobby-horsing or pitching, that would be greater if the weight was in the front round forward of these berths which is instead open next to the beds, allowing for additional stowage in the cabins.

The bathroom aft on the stb side is extremely roomy for a boat this size with the shower aft.
Forward on the port side are a head, hand basin and optional shower making it an en-suite for that cabin.
There are 2 options for the cockpit, depending on where the boat will mainly be sailed. The “tropical” option has a raised cockpit floor and a raised bimini that allows for a better airflow in the cockpit and will have removable “clears” on the front and even the sides to keep out the weather. An important feature is that the bimini also provides shade for the helmsman, a very desirable feature for a boat in the tropics.

The other option has the extended cabin roof with the cockpit floor at the same height as the saloon. This is a better option for colder climates.

Helm can be either a single or twin helms.

There is a comfortable seat along the back of the cockpit, the top of which carries the traveller with a mainsheet winch either end with walk throughs to the aft deck and swim steps.

A clever use of space in the hulls has produced large engine rooms with the 30hp Nannis well forward but still in the own compartments under the aft decks with access to these through a hatch in the aft decks. Having the engines slightly forward and not right in the sterns also reduces pitching and improves the overall motion.

The Senggigi 12.5 has the option of minikeels or daggerboards. Another option can be to have small minikeels and one daggerboard, possibly the best option for a cruising catamaran.

Plans

Plans are very detailed and comprehensive and include full size patterns for the hull and deck and all bulkheads and for the cabin as well as the keel and rudder.2.5 Metre Offshore Performance Catamaran designed by Mark Pescott Multihulls.

Specifications

LOA 12.5 m (41’)            Draft  
LWL 11.94 m (39’ 2”)   Hull 445 mm
BOA 7.03 m (23’ 1”)   Rudders
 780 mm
BCL 5.40 m (17’ 9”)   Daggerboards
2.10 m
Hull BWL 996 mm (3’)  
 
Hull LWL : Hull BWL  
 12.0 : 1   Heights
 
  Mast Height above deck 15.9 m (52’ 2”)
Displacement     Underwing Clearance 720 mm – 900 mm
DWL 5320 kg  

Empty 4400 kg   Headroom
Cruising 6500 kg   Hulls 1.98 m
Immersion at DWL 188 kg/cm   Saloon 1.95 m
     
 
Working Sail Area        
Main and Genoa
 86 m2 (925 ft2)