The concept behind the Nauta 70 is a balance between racing performance and providing a high standard of interior comfort for cruising. The design is very similar to that of racing Maxi’s in terms of the ratio of waterline to displacement and sail area to wetted area. The hull itself is built from multiaxial glass fibre / Kevlar skins on a closed cell PVC core. This is then vacuum bonded together as it achieves minimum resin build up and a total load cell measured weight of only 2700kg.
Weight saving techniques are continued in the accommodation, foam cored Mahogany bulk heads are used saving in total hull weight approximately 1200kg. This difference in Hull weight has made it possible to fit systems such as desalinators and air conditioning without drastically reducing performance. Even with these extras the Nauta 70 is still 20% lighter than if it had been constructed of traditional materials.
Weight distribution is also carefully considered, with most of the systems in the centre of the boat sited in a sound proofed instrument room. Engine, desalinisation plant, air conditioning and generator are all near the centre of gravity with the fuel and water tanks. Silandra also has new Lewmar commander 400 hydraulics that operate the Genoa furler, secondary winches and halyards, located in the aft cockpit. There is also a secondary hydraulic unit that gives manual control of the preventer shroud, outhaul, baby stay and reefing.
The steering system was also rebuilt as part of Silandra’s refit along with the anchor windlass. The bottom of the hull was also stripped, faired and refinished.
The interior layout of the Nauta 70 has been as carefully considered as her construction. The saloon has two symmetrical tables, which can together seat 16 people using the extra folding chairs. The expansive owners cabin is located right aft; it boasts a small desk and dressing table, small sofa and five hanging lockers. The four cabins can sleep eight people in total and are designed with comfort in mind; all lined in Honduras mahogany each with an en suite heads compartment. As part of her refit Silandra’s interior has been refinished and also the bathroom fittings have been replaced.
The need for space has not been forgotten; the door separating the galley from the saloon and the forward control room fold back to give a long gangway on the port side. Spare sails can also be stored in the after gangway, which leads into the owners cabin. The navigation station also faces fore and aft, with plenty of workspace for charts, and good access to navigation equipment.
One 24,000 BTU reverse cycle in the Main Salon, driving two 12,000 BTU airhandling units.
One 10,000 BTU reverse cycle in Aft cabin driving one 10,000 BTU airhandling unit.
One 15,000 BTU reverse cycle in Forward cabins driving three 5,000 BTU airhandling units.
The Nauta 70 also features a dedicated service cabin which houses the central wiring boxes, battery chargers, main pumps, pump manifold and workbench. There is also access to the back of the 24v main breaker panel, which is mounted at the navigation station. Silandra has also been totally re-wired as part of her very recent extensive rebuild/refit.
2 battery banks for house system
Separate battery bank for engine start
Separate battery for generator
AC system 120/240 60 cycle
2 120 amp Zantrex battery chargers
2 3KW Zantrex invertors
MAN Diesel 270HP, which has been totally rebuilt, and electronics replaced – 0 Hours since rebuild
ZF220A Gearbox with 2.54-1 reduction
In the soundproofed engine room is also found the freshwater pressure demand pumps, accumulator tanks, new Westerbeke 15KW 60 cycle, and air conditioning plant (Ocenaire 1 24K BTU, 1 10K BTU compressors) The cockpit sole above the engine room can also be easily removed.
3 bilge pumps with pickups center, forward and aft.
3 Headhunter electric flush heads
1 Vacuflush manual heads
30-gallon grey water tank
30-gallon black water tank
All tanks stainless steel
HRO SFC-2 watermaker – 58 gallons per hour, 1,400 gallons per 24 hours.
8 man life rafts, serviced in November 2006.
The fire extinguishing system and life jackets are to be installed / purchased as part of Silandra’s on going refit.
Raymarine E80 multifunction navigation display at steering station
E120 at nav station
4KW 24" Radome
ST8002 auto pilot
Rudder angle display
ST290 wind angle and speed display
ST 290 compass display
ST 290 knot meter and depth sounder and water temp
Flux gate compass
S 1000 wireless autopilot remote w/ display
ICOM 602 VHF w/ 2 waterproof remote microphone units
ICOM 802 SSB w 140 antenna coupler
Force Ten 4 burner stove/oven
2 fridge/freezers & 2 fridges
All appliances stainless steel
Deck Gear and Rigging
Lewmar / Navtec hydraulics & rigging
Lewmar winches (17)
Hall Spar mast and boom - 4 spreader mast machined to achieve the various moments of inertia specified in Bruce Farr’s design
Navtec rod rigging - surveyed October 2006
EPI Kevlar runners
New Sobstad sails
Lofrans Titan A 2KW 24V windlass with wireless remote - total rebuild including new electric motor and wireless remote
350 foot of 12mm chain
105 pound CQR anchor
Mast, Boom, Spinnaker Pole Awlgripped
The deck layout is surprising, the secondary not primary winches are electrically controlled, and this is to aid the boats versatility as a cruiser / racer. When racing-sheeting speed is often more important than strength, as there are enough crew to haul the Genoa. When cruising sheeting strength is more of a priority due to depleted crew numbers, to aid this transition the Genoa can as easily use the primaries (manual) as the secondaries (hydraulic). There is also a large diameter wheel set in a deep well, which is of laminated mahogany and carbon
There is an adjustable baby stay for race tuning, whilst the winches at the mast foot are positioned for maximum racing efficiency.
Quantum Fusion Cruise MC 7500 Mainsail (2012).
Quantum Fusion Cruise Intermediate Genoa (2012).
As mentioned previously Silandra has recently undergone an extensive refit / rebuild. These items are listed below.
New Awlgrip application; most recently dark blue Awlgrip topsides paint (2012).
Bottom of the hull was stripped, faired and refinished
Complete engine rebuild
Engine electronics replaced
New appliances, electronics
New Lewmar Commander 400 hydraulics
Mast and Boom refinished
Complete instrumentation by Raymarine
New bathroom fittings
Sail cover, dodger
Full Awning (mast to back stay) - brand new
Deck/cockpit area and boarding area courtesy lights - brand new
New mattresses and cushions, newly upholstered
MaxPower bow thruster.
SILANDRA has now completed her refit and is ready to be sailed. Her owners do not have time to use her and are therefore anxious to achieve a timely sale. They are also happy to discuss fractional ownership and other proposals for the yacht sale.
She is now in cosmetically excellent condition and all her main systems are new. She turns heads wherever she goes.