Multihull Dynamics, Inc.

The Waller 1100 is a full bridge deck cat built entirely of marine plywood, in an attempt to produce a sound and comfortable ocean cruising vessel at a lower cost than is typical of cats built in most other materials. In this period of ever increasing costs associated with boat building, the use of plywood and the Wood/ Epoxy building technique is a sound and economic exercise for the amateur builder.

CONCEPT
The1100 is a full bridge deck cat intended to be easy and inexpensive to build, and yet still capable of living aboard and ocean voyages. Because she is intended for extensive cruising, she has been designed with wider hulls for load carrying ability and internal roominess. (We have shown with previous designs that good performance is possible with wider hulls, as hull beam to length ratio is only one aspect of boat performance.)

Design alternatives include 2 differant rig options, mini keels or center boards, o/b motor or inboard diesel options, and 4 alternate arrangement choices, as well as variations on the cockpit roof styling.

RIG
The Sunseeker comes with two sail plans as standard. The standard rig is the typical heavy roached and fully battened main and 7.8th rig which time has shown to be the most efficient rig for catamarans. The alternate low tech rig features a simpler, smaller main with small roach and short battens. This rig will not provide as high a performance as the standard rig, but for cruising it is a good low cost alternative. Because the rigs share the same spars, a builder can set up the alternate rig for low cost, and can switch to the standard rig later by simply replacing the main and moving the mast step forward (allowed for in the plans). Options for timber / epoxy spars are provided in the plans.

CONSTRUCTION

The1100 is all plywood with some timber framing. The multi chine shape of the hulls and the careful design of the deck and turret cabin mean that there are no compound curves on the vessel, thus making the use of sheet plywood very simple. The basic construction is ply skin over an armature of plywood bulkheads and frames and timber longitudinals, with glass sheathing overall on the outer surfaces. Full use has been made of timber / epoxy construction, with timber framing used only where it is necessary, or the more logical option.

ACCOMMODATION

The1100 comes with two standard alternate accomodation plans (galley up and galley down.) Both arrangement plans feature twin berth cabins forward and a double berth in the aft Starboard hull, with W.C./ Shower compartment to port aft. Mai berths can be fore / aft or transverse. The galley up arrangement features galley and dinette on the bridge deck, whilst the galley down features a larger lounge area and chart table on the bridge deck and a larger galley in the mid starboard hull. Variations on both these arrangements are also possible for inboard engine installations, which require the shower area to be moved forward slightly, and slight variations on the bridge deck.

DIMENSIONS

LOA 11.00 Metres
LWL 10.00 Metres
Beam 0.A. 6.50 Metres
Beam Hull W.L. 1.14 Metres
Draft (Mini Keels) .95 Metres
(C/B Down) 1.72 Metres
(C/B Up) . 70 Metres
Displacement 5700 Kg
Hull Beam/LWL ratio 8.8:1
Sail Area 74.8 Square Metres (Standard rig)
69.5 Square Metres (Low Tech rig)
Max. Payload 2000 Kg (1000 Kg to Load Waterline)
Headroom 2 Metres Min
Bridge deck clearance 770 mm

Plans for the Waller 1100 are extremely comprehensive, with 37 full A1 size sheets of plans, plus written specifications and building notes. DXF files are available for pre-cutting of bulkhead components.
Study Plans ......................... $30.00 Aud.
Full Plans .......................... See Price List