Simpson Cloud 12 Re-powered, re-rigged, superbly presented cruiser
Currency
Length
39' 8" - 12.10m
Vessel Location
Newport Marina, Redcliffe
Launch Year
1989
Hull Material
Fibreglass/GRP Glass over ply. Vinylester hull. Extended hull with transom steps to the water.
Comfortable, Capable Liveaboard with Recent Engine & Rigging Upgrades. This is multihull sailing at the right cost. Professionally built in 1989 by Noosa Glass Industries to Roger Simpson's well-regarded Cloud 12 design, this series has long been respected for its generous internal volume, dependable performance and excellent load-carrying ability-making it a popular choice for extended cruising and liveaboard lifestyles.
Significant recent investment has substantially enhanced the vessel's appeal. Twin Yanmar 30hp diesel engines (2024), new gearboxes, shaft seals and steering controls have transformed reliability and ease of operation, while the standing rigging was replaced in 2025. These upgrades, combined with ongoing preventative maintenance represent a substantial investment and offer genuine peace of mind for a future owner. Complementing this, the cockpit was freshly painted in 2026.
With practicality and seaworthiness in mind, 'Knee Deep' is a spacious Australian cruising catamaran that places comfort, practicality and reliability ahead of outright performance.
Internally, the boat is comfortable, clean and highly functional. A well-designed down galley features generous refrigeration, freezer capacity and a recently installed microwave, while the saloon offers excellent visibility through forward-facing windows and a large, extendable dining table ideal for both everyday living and entertaining.
Accommodation is well presented, with clean flooring and bulkhead capeting and ample storage throughout with tidy bathroom facilities including a composting toilet system.
'Knee Deep' is an honest, capable and well-upgraded cruising catamaran that represents excellent value in today's market for buyers prioritising function, space and reliability. She presents as structurally sound, mechanically updated and ready for immediate use.
Major Recent Upgrades 2024-2026
- Twin new Yanmar diesel engines
- New gearboxes & shaft seals
- New standing rigging
- Recent antifoul
- Cockpit repaint
- New microwave
- Upgraded anchor & chain
- 200-hour engine service completed
Additional features include:
- Dinghy with near-new outboard on davits
- Extended transom with practical access steps
- Recently upgraded anchor and chain
- Full ownership history with documented maintenance timeline
- Recent survey report available
- Electronics are operational though dated, offering a clear opportunity for a new owner to modernise to their own preferences over time.
Designed as a comfortable cruising catamaran, 'Knee Deep' is happiest covering coastal miles at an easy, predictable pace. She rewards relaxed passagemaking, offers exceptional stability at anchor and provides the kind of practical living space that encourages extended time aboard. Combined with a recent antifoul, ongoing preventative maintenance and comprehensive service records, these upgrades represent many of the major expenses prospective owners would otherwise expect to undertake themselves.
WATCH the sailing action on board and take a tour of the interior with the walkthreough video and DOWNLOAD the exclusive brochure to find out more. For viewings, plesae call EziYacht's Lead Broker Sonia Robinson.
EziYacht is recognised as Australia's leading independent marine brokerage that goes above and beyond the conventional norms. We have received multiple awards for our 'Customer-focused' approach and in 2024 we were selected as a Queensland State Finalist of the Telstra Best of Business Awards for our commitment to empowering and accelerating women in boating. Our dedication to our clients' satisfaction sets us apart, making our services not only competitive but also truly unique.
Price
AU $219,000
Vessel Name
Knee Deep
Launch Year
1989
Length
39' 8" - 12.10m
Beam
6.3m
Draft
1.2m
Displacement
Approx 6000 kgs
Keel / Ballast
Vinylester keels. Vinylester hull below waterline (glass-timber-glass sandwich). Rudders are aluminum.
Vessel Location
Newport Marina, Redcliffe
Region
Queensland
Use
Leisure, Cruising, Live Aboard
HIN
AUWWA163071C10
Registration
AXT89Q
Rego Expiry
27/04/2027
Designer
Roger Simpson
Builder
Noosa Glass Industries
Hull Material
Fibreglass/GRP Glass over ply. Vinylester hull. Extended hull with transom steps to the water.
Decks Material
Fibreglass over marine ply. Bulkheads are marine grade plywood fibreglass taped to the hull. Extended sugarscoops with steps and hatches. '143 Boat Building' added transom step extensions to each hull @ The Boatworks 2019-20.
Engine
3YM30AE x 2 professionally installed 2024 with new s/s shafts and cutlass bearings.
PSS seals x 2 (2025). Porters 3-blade props x 2 fitted (2021).
Yanmar Kanzaki, KM2P-1, Ratio 2.62 gear boxes.
2025 - haul out
Engine raw water thru-hulls replaced
Drive shaft anodes replaced
2026 service
Fuel / Oil filters, Alternator belts, water pump belts, impellers
Spare belts and impellers supplied.
Engine Make
Yanmar
Number Engines
2
Horsepower
30 x 2
Fuel Type
Diesel : 2 x Yanmar 30hp (2024) with new gear boxes, shaft seals (2025) and new props (2021).
Engine Hours
125 (200hr service completed 2026)
Engine Hours (2nd Engine)
125 (200hr service completed 2026)
Fuel Consumption
1.5 to 2L/hr @1500 - 1800rpm. Diesel measured with a dipstick.
Max Speed
7kts under motor
Cruise Speed
5kts @ 1200RPM -Hydraulic (single helm) steering. Twin Vetus-type throttle/gear levers fitted 2024 at the helm (portside).
Propulsion
Inboard Shaft Drive : Twin Porters 3-blade fixed props (new 2021)
Genset
N/a
Fuel
180L (90L x 2 polyurethane tanks located above engines in forward lockers). 2 x 20L jerry cans.
Water
600L (300L x 2 w/ Jabsco pumps - one in each hull. . (Fibreglass tanks built into hulls with inspection port and deck filler inlets. Puretech water filter.
Dinghy
Highfield 2.9m (2018) Highfield hypalon 2.9m inflatable with aluminium bottom - fitted securely on electrically operated davits. Manual foot pump.
Outboard
Mercury 6hp (4-stroke) - 3yrs old.
Covers
Full navy sunbrella canvas wraparound cockpit enclosure with clear windows, covers and fly screens. Individual removable panel sections. Front windscreen with UV mesh covers. Tinted cockpit windscreen. Overhead link cover. Outboard cover. BBQ cover. (Rigid aluminium cockpit hard top and bimini fitted by previous owners. )
Accommodation
'Knee Deep' reveals a bright, welcoming interior that has been carefully maintained with comfort and practicality as the priority. Large saloon windows flood the living space with natural light while providing excellent visibility from the dining area, creating a bright and welcoming atmosphere. A large dining table extends to seat 12 pax comfortably with access to the galley in the starboard hull. There are two well-appointed heads each end of the vessel, including one electric marine toilet and one odour-free composting toilet, offering practical flexibility for extended cruising.
Clean finishes, generous storage and sensible design combine to make 'Knee Deep' equally suited to weekends away or extended periods living aboard.
Clean finishes, generous storage and sensible design combine to make 'Knee Deep' equally suited to weekends away or extended periods living aboard.
Cabins
2 x Queen cabins fwd, 1 x Double aft. (Single pilot berth).
Accommodation is arranged with two generous forward queen cabins and an additional aft double cabin, providing comfortable sleeping arrangements for family and guests. The port cabin extends to a dedicated laundry compartment in the bow (currently used as a walk-in wardrobe), while starboard bow compartment is fitted with an ensuite.
Access to the saloon via cockpit through lockable double doors. The saloon is fitted with an extendable dining table with upholstered wraparound lounges. The interior is carpeted throughout with 12v fans fitted in each cabin.
Accommodation is arranged with two generous forward queen cabins and an additional aft double cabin, providing comfortable sleeping arrangements for family and guests. The port cabin extends to a dedicated laundry compartment in the bow (currently used as a walk-in wardrobe), while starboard bow compartment is fitted with an ensuite.
Access to the saloon via cockpit through lockable double doors. The saloon is fitted with an extendable dining table with upholstered wraparound lounges. The interior is carpeted throughout with 12v fans fitted in each cabin.
Berths
6 (2+2+2): Sleeps 6 in three cabins (2 x Queens forward hulls, 1 x Double starboard aft hull)
Shower
Large internal shower fitted in port aft cabin with instant gas hot water system (port aft head).
Toilet
2: 1 x TMC electric macerating toilet (port aft) and 1 x odour-free (Coir fibre) composting toilet (stbd bow) with 12v extractor fan.
Entertainment
Palsonic TV, Digitech controller, Sony AM/FM radio, Sony DVD player.
Air-Con
5 x 12v fans (3 fixed, 2 x large portable 12v fans used in saloon and nav station. )
Galley
Positioned in the starboard hull, the light-filled galley is superbly equipped. Extensive timbertop bench space, excellent refrigeration and freezer capacity, hot and cold pressurised water, a Force 10 gas stove with oven and a recently installed microwave provide everything required for preparing meals aboard. The layout is both practical and secure under way, while connected to the adjoining saloon.
Various crockery and utensils: (plates, cups, cutlery, saucepans, electric fry-pan, kettle, storage containers).
Various crockery and utensils: (plates, cups, cutlery, saucepans, electric fry-pan, kettle, storage containers).
Refrigeration
Ventrigo s/s dual fridge / freezer with large front opening drawers. Waeco portable 12v fridge (aft cabin).
Freezer
Ventrigo s/s dual fridge / freezer with large front opening drawers.
Stove
Force 10 2-burner stove with oven. (Gas bottles are securely stowed in the cockpit transom locker. ) Hisense 800W Microwave (2026).
Water-Maker
S/S sink with hot/cold pressurised water. 1 x hand prime salt water tap.
Hot Water
Gas Hot Water system (port aft head).
Ground Tackle
Muir VR/VRC 1000 vertical windlass with foot and cockpit switch controls. Rocna 25kg fitted at bow with 60m (regalvanised 2025) x 10mm chain. Spare Danforth. Kellet anchor buddy.
Safety Gear
Fire Blanket. Fire extinguishers x 3. Life rings with floating lights x 2. Flares - expiry 06/28. Epirb - expiry 2035. PFD's: (Burke) Type 1 - auto inflate x 4.(Hutchwilco) Type 2 x 4. Harness x 2. Seabrake parachute drogue.
Bilge Pumps
6 x 1000 GPH auto-electric w/ float switches (3 in each hull). Manual bilge pump fitted aft cockpit.
Epirb
Expiry 2035
Life Jackets
(Burke) Type 1 - auto inflate x 4.(Hutchwilco) Type 2 x 4. Harness x 2.
Flares
Expiry 06/28
Fire Protection
X 3 dry powder
Electrics
POWER
Electrical power is supplied by dedicated engine start batteries and a substantial AGM house battery bank, supported by high-output alternators, solar generation, wind generation, shore power charging and a Xantrex inverter for 240-volt appliances.
BATTERIES
Start: 780CCA x 2 (11/2024,01/2025) - located in engine compartments.
House: 130amp AGM x 4 (2020) - located under saloon settee.
AUXILLIARY POWER
Charging is provided by the engine alternators, the Enerdrive Epower 12-volt, 40-amp 3 bank battery charger, an Air Breeze wind generator and four 125-watt solar panels mounted on the davit/Targa arch.
SOLAR: 125W x 4 panels mounted on davits arch. Xantrex controller (fitted into cupboard behind helm).
WIND: Airbreeze. Control switch located in cupboard behind helm.
INVERTER/CHARGER: Enerdrive (charger) 12v-40A, 240v input.
Prosine (inverter) 1800i (12v-240v)
12v plug-ins x 5
240v GPO power outlets (double x 4, single x 1).
240v shorepower inlet, 15 AMP inlet.
Shorepower leads (15A) x 2. BEP isolator units are positioned at nav station.
Electric bilge pumps fitted with manual overide and dedicated switch panel at nav station.
LIGHTING: LED cabin lighting with circuit breaker switches at nav station and individual light switches throughout the vessel.
Electrical power is supplied by dedicated engine start batteries and a substantial AGM house battery bank, supported by high-output alternators, solar generation, wind generation, shore power charging and a Xantrex inverter for 240-volt appliances.
BATTERIES
Start: 780CCA x 2 (11/2024,01/2025) - located in engine compartments.
House: 130amp AGM x 4 (2020) - located under saloon settee.
AUXILLIARY POWER
Charging is provided by the engine alternators, the Enerdrive Epower 12-volt, 40-amp 3 bank battery charger, an Air Breeze wind generator and four 125-watt solar panels mounted on the davit/Targa arch.
SOLAR: 125W x 4 panels mounted on davits arch. Xantrex controller (fitted into cupboard behind helm).
WIND: Airbreeze. Control switch located in cupboard behind helm.
INVERTER/CHARGER: Enerdrive (charger) 12v-40A, 240v input.
Prosine (inverter) 1800i (12v-240v)
12v plug-ins x 5
240v GPO power outlets (double x 4, single x 1).
240v shorepower inlet, 15 AMP inlet.
Shorepower leads (15A) x 2. BEP isolator units are positioned at nav station.
Electric bilge pumps fitted with manual overide and dedicated switch panel at nav station.
LIGHTING: LED cabin lighting with circuit breaker switches at nav station and individual light switches throughout the vessel.
Electronics / Navigation
Designed to support comfortable coastal cruising and extended time aboard, 'Knee Deep' features a practical combination of navigation, electrical and onboard systems that have been maintained and upgraded over time. Everything is logically arranged and easily accessible, allowing owners to become familiar with the vessel quickly while enjoying the reassurance of proven, dependable equipment.
NAVIGATION
GPS: Furuno GP-7000F GPS/ Chart plotter
AUTOPILOT: Course master CM95
WIND: Raymarine bluetooth transducer fitted NEW (2025)
RADIOS X 2: GME 558 VHF fitted at nav station. GME GX600D VHF at helm station.
RADAR: Inritsu 23-mile radar fitted but not used.
AIS: ICOM 510TR, Class B transceiver.
COMPASS: Silva - oil float fitted at helm station.
Electronic bearing readout from Chart plotter, AIS and Course Master (standby).
Paper Charts: Moreton Bay to Keppel Group.
DISPLAYS: Tack Tick solar charged wireless wind direction, wind speed, tansducer depth, speed over ground (paddle wheel).
Rudder angle: Indicator needle for rudder angle
AIS ClassB: Posiiton, Course, SoG, surrounding vessels
Chart plotter: Position, bearing, SoG, Track
Course Master: Bearing
LIGHTS: Deck level Port / Stbd / Stern LED.
Masthead Steaming and Tri-colour.
NAVIGATION
GPS: Furuno GP-7000F GPS/ Chart plotter
AUTOPILOT: Course master CM95
WIND: Raymarine bluetooth transducer fitted NEW (2025)
RADIOS X 2: GME 558 VHF fitted at nav station. GME GX600D VHF at helm station.
RADAR: Inritsu 23-mile radar fitted but not used.
AIS: ICOM 510TR, Class B transceiver.
COMPASS: Silva - oil float fitted at helm station.
Electronic bearing readout from Chart plotter, AIS and Course Master (standby).
Paper Charts: Moreton Bay to Keppel Group.
DISPLAYS: Tack Tick solar charged wireless wind direction, wind speed, tansducer depth, speed over ground (paddle wheel).
Rudder angle: Indicator needle for rudder angle
AIS ClassB: Posiiton, Course, SoG, surrounding vessels
Chart plotter: Position, bearing, SoG, Track
Course Master: Bearing
LIGHTS: Deck level Port / Stbd / Stern LED.
Masthead Steaming and Tri-colour.
Sail Inventory
MAIN: 'Evolution' dacron furling Main. Easiest to deploy manually and furl with hydraulic winch on stbd tack.
GENOA: Furling dacron genoa with renewed UV strip.
FURLER: Profurl genoa furling system - serviced 2025.
SPINNAKER: Assymetric spinnnaker in sock. Pole fitted.
GENOA: Furling dacron genoa with renewed UV strip.
FURLER: Profurl genoa furling system - serviced 2025.
SPINNAKER: Assymetric spinnnaker in sock. Pole fitted.
Mast / Rigging
In-mast hydraulic furling mainsail with single in-line spreaders.
MAST: Deck-stepped with single spreaders - polished aluminium. New hydraulic hoses fitted 2026.
RIGGING: Standing rigging replaced in-situ 2025 (rig inspection report -Rope Solutions). Mast re-stepped June 2026.3 x SS wire run stanchions.
WINCHES: Barient 27ST x 2. Lewmar 16 x 2.
MAST: Deck-stepped with single spreaders - polished aluminium. New hydraulic hoses fitted 2026.
RIGGING: Standing rigging replaced in-situ 2025 (rig inspection report -Rope Solutions). Mast re-stepped June 2026.3 x SS wire run stanchions.
WINCHES: Barient 27ST x 2. Lewmar 16 x 2.
Deck Gear
S/S telescopic swim ladder fitted on Port transom. Teak boarding platform for easy boarding from tender. Dinghy and outboard cranes (operated from main switch panel). Bosuns' Chair. Webber BBQ with dedicated 4kg gas bottle. House gas bottles x 2 gal 4kg (in service), Lewmar deck hatches.
(10L petrol jerry can for outboard plus spare 20L petrol jerry).
OTHER:
Insect Screens. Block out/Privacy screens for windows and cabins. Saw, Ryobi 18 v Drill, Light, Spotlight, Charger. Oil extractor 5L (2025). Hookah Power Dive 12v dive unit, mask, weight belt, spring suit. Various boat cleaners, solvents, tools and equipment. Engine spares: 15W-40 oil, 1 x impeller, 2 x alternator belts, 2 x water pump belts, fuel filters. Tools: Ryobi 240v 1400W Dry/wet vac (in storage).
Ryobi hand vac (18v Li battery), charger.
(10L petrol jerry can for outboard plus spare 20L petrol jerry).
OTHER:
Insect Screens. Block out/Privacy screens for windows and cabins. Saw, Ryobi 18 v Drill, Light, Spotlight, Charger. Oil extractor 5L (2025). Hookah Power Dive 12v dive unit, mask, weight belt, spring suit. Various boat cleaners, solvents, tools and equipment. Engine spares: 15W-40 oil, 1 x impeller, 2 x alternator belts, 2 x water pump belts, fuel filters. Tools: Ryobi 240v 1400W Dry/wet vac (in storage).
Ryobi hand vac (18v Li battery), charger.
Remarks
BACKGROUND:
'Knee Deep' is one of four 'Cloud 12' designs by Roger Simpson - professionally built to a proven design to professional survey standards by Noosa Glass Industries. Vessel built in Noosa and based in Hervey Bay - originally called Stingray. Sold to Lake Macquarrie (liveaboard) couple who underwent a refit, rig, mast, elec rewire in 2012, and extended the sugarscoop transoms in 2019. Cruised East Coast (Whitsundays).
Current owners purchased in 2021 from friends. Cruised Moreton Bay to Keppels. They have found her to be safe and secure with a very comfortable interior.
Owners Notes:
"Over the years we have sailed Dinghies, Trailer Sailers, Trimarans and Monohulls. "Knee Deep" is the first catamaran that we owned.
We knew the previous two owners and were aware of 'Knee Deep's' adventures. The use of vinylester resin by Noosa Glass Industry's in the hull layout minimised osmosis risk and not having to deal with osmosis was very attractive to us. Also the direct shaft drive removes the complexity of sail drive mechanisms and the need for elaborate seals.
We have had two trips to the Keppel group and adventures around the Sandy Straits, Moreton Bay and the Bay Islands. Pancake Creek and Bustard Head remain a favourite stop over. We use 5kn for trip planning. 'Knee Deep' can comfortably hold 5kn at 10kn wind speed.
'Knee Deep' is a great cruising catamaran. Like most cats she laps up a downwind run or a broad reach. Sailing to windward is usually assisted by the twin Yanmar 30hp diesels. On any bearing the hydraulic steering minimises stress on the helm. The Rocna anchor gives confidence. 'Knee Deep' is very stable at anchor, you don't get the pitching and rolling that can keep you awake at night. 'Knee Deep is spacious'. The open saloon provides room to plan your trip and entertain friends. The two queen sized cabins allow you to stretch out and rest. The galley and navigation station are well laid out and have full head room. "
Sailing Notes:
Performs best in winds upwards of 15 - 20kts under full rig. Hydraulic steering is very light. Motor sailing best for upwind sailing. Headsail is reefed before main. Mainsail is best deployed (unfurled) manually on starboard tack. A lever at the mast is all that's required to switch from manual to hydraulic but vessel must be on stbd tack to allow for furling direction. Owners claim that she is great fun on a reach, safe in bad weather and perfect for two people. They love sitting on the steps on the foredeck with a glass of wine in hand. Rain can be collected to top up tanks. Great protection from drop down clears with canvas covers - fitted around the cockpit with large zippers and slide on /off sections. Allows for extending the saloon and cockpit into one large open-plan living area.
Antifouled Feb 2026
Cockpit paint renewed May 2026. Replaced Sep 2025 (last haul out antifoul).
'Knee Deep' is one of four 'Cloud 12' designs by Roger Simpson - professionally built to a proven design to professional survey standards by Noosa Glass Industries. Vessel built in Noosa and based in Hervey Bay - originally called Stingray. Sold to Lake Macquarrie (liveaboard) couple who underwent a refit, rig, mast, elec rewire in 2012, and extended the sugarscoop transoms in 2019. Cruised East Coast (Whitsundays).
Current owners purchased in 2021 from friends. Cruised Moreton Bay to Keppels. They have found her to be safe and secure with a very comfortable interior.
Owners Notes:
"Over the years we have sailed Dinghies, Trailer Sailers, Trimarans and Monohulls. "Knee Deep" is the first catamaran that we owned.
We knew the previous two owners and were aware of 'Knee Deep's' adventures. The use of vinylester resin by Noosa Glass Industry's in the hull layout minimised osmosis risk and not having to deal with osmosis was very attractive to us. Also the direct shaft drive removes the complexity of sail drive mechanisms and the need for elaborate seals.
We have had two trips to the Keppel group and adventures around the Sandy Straits, Moreton Bay and the Bay Islands. Pancake Creek and Bustard Head remain a favourite stop over. We use 5kn for trip planning. 'Knee Deep' can comfortably hold 5kn at 10kn wind speed.
'Knee Deep' is a great cruising catamaran. Like most cats she laps up a downwind run or a broad reach. Sailing to windward is usually assisted by the twin Yanmar 30hp diesels. On any bearing the hydraulic steering minimises stress on the helm. The Rocna anchor gives confidence. 'Knee Deep' is very stable at anchor, you don't get the pitching and rolling that can keep you awake at night. 'Knee Deep is spacious'. The open saloon provides room to plan your trip and entertain friends. The two queen sized cabins allow you to stretch out and rest. The galley and navigation station are well laid out and have full head room. "
Sailing Notes:
Performs best in winds upwards of 15 - 20kts under full rig. Hydraulic steering is very light. Motor sailing best for upwind sailing. Headsail is reefed before main. Mainsail is best deployed (unfurled) manually on starboard tack. A lever at the mast is all that's required to switch from manual to hydraulic but vessel must be on stbd tack to allow for furling direction. Owners claim that she is great fun on a reach, safe in bad weather and perfect for two people. They love sitting on the steps on the foredeck with a glass of wine in hand. Rain can be collected to top up tanks. Great protection from drop down clears with canvas covers - fitted around the cockpit with large zippers and slide on /off sections. Allows for extending the saloon and cockpit into one large open-plan living area.
Antifouled Feb 2026
Cockpit paint renewed May 2026. Replaced Sep 2025 (last haul out antifoul).
CONTACT DETAILS
Dealer
EZIYACHT
Telephone
Address
13 Ilya Street
South Moreton Bay QLD Australia
South Moreton Bay QLD Australia
Website
Buy with Confidence
Boating Industry Assocation Accredited Member
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