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STEALTH 520 patrol - Specifications

Designer: STEALTH yachts and Professor Hoppe
Overall Length: 15.5m 52.0ft
Waterline Length: 13m 42ft
Beam: 5.5m 18ft
Draft: Maximum Load 1.2m 3.9ft
Displacement: Lightship: 18 000Kg 39 700lbs
Displacement: Maximum Load
22 950Kg 50 620lbs
Water Capacity: 430 liters 113 US Gal
Fuel Capacity: 1750 liters 460 US Gal
Engines: MAN R-6 800HP x 2
Surface Piercing Propulsion system: Integral system with 5-Blade VEEM Interceptor, handed, surface propellers
Maximum Speed: 45 Knots (Lightship Calm Sea and Wind Conditions)
Range at 35 Knots: 370 Nautical Miles (Lightship Calm Sea and Wind Conditions)
Cruising Speed: 35 Knots
Layouts: Various Options
  • Antifouling over epoxy based osmosis barrier
  • Closed cell PVC foam core, vacuum bonded for stiffness, strength and minimal weight
  • Fore and aft hydrofoils, HYSUCAT
  • Forward water tight compartments
  • Heavy duty, hand laid-up GRP construction using multi layers of quadraxial glass roving, vinylester resin and other highest-grade material
  • Marine ply and foam core on critical structure bulkheads for added strength and stiffness
  • Deck strengthened and reinforced for light-calibre weapons platforms, forward and aft
  • Working decks self-draining with non-skid finish
  • Boarding transom doors 2
  • GRP engine access hatches 4
  • GRP foredeck hatch 1
  • Hull port-lights 8
  • Tinted, laminated/toughened, glass windows
  • Weather-tight doors for access from cockpit to deckhouse and access from forward cabin to foredeck recessed weapons platform


  • Engines: MAN R6-800 HP, common-rail diesel engines with electronic controls and full digital instrumentation 2
  • ZF 360A, 7-Deg angle gearboxes with hydraulic clutches, gearbox trolling valves for slow-speed operation 2
  • HyDrive hydraulic power steering system
  • Integrated surface piercing propulsion system
  • VEEM 6 bladed surface piercing propellers 2
  • Engine and gearbox sump-pump for removal of lubricating oil
  • Engine room fire extinguishers
  • Engine-room sound insulation
  • Stainless steel drive shafts with thrust beatings and torsional-vibration dampers


  • Fuel system with fuel pre-filters, primary filters and shut-off valves
  • Integral fuel resistant epoxy fuel tanks separate from the hull structure complete with internal baffles and inspection covers
  • Roto-moulded, polyethylene water and waste tanks
  • Automatic electric bilge pumps 6
  • Each bilge fitted with a high-water alarm
  • Electric fire pump with metal-pipe reticulation 1
  • Manual bilge pumps 2
  • Watertight compartment sections per hull individually piped for bilge water and separated by watertight doors 3
  • Basin and shower electric sump pump for overboard discharge 1
  • Black water holding tank evacuation pump connected with a Y-diverter valve for deck pump-out 1
  • Electric fresh water pumps with all water piping of non-corrosive materials 2
  • Electric toilet with isolation valves 1
  • Hot water cylinder30L 1
  • High volume engine room ventilation blowers
  • Engine room air intake and outlet vents fitted with emergency closing mechanism
  • Deckhouse and washroom air extractor fans
  • 60,000BTU Air-conditioning in crew cabins and deckhouse

Electrical Systems

  • Alternator per engine for start batteries 60A/ 24V
  • Alternator per engine with high-output regulators for house batteries 75A/ 24V
  • Battery Charger 150A
  • Battery isolator switches
  • Cockpit flood fights
  • DC Ammeter and voltmeter digital instrumentation
  • Deckhouse, accommodation and washroom ceiling lights
  • Engine compartment lights
  • Engine start batteries (12V) in independent 24V starting banks 4
  • Ships load batteries (24V) gel - 600AH
  • Start battery crossover connector
  • AC outlets: 2 in galley, 1 at helm, 1 below helm, 1 per cabin, 1 in head and 1 per engine room 9
  • DC Ammeter and voltmeter digital instrumentation with supply selector switchgear
  • Generator 12/10kW
  • Inverter 6kW
  • Shore power cable socket 50A/120V (30A/240V) 1
  • Digital Compass 1
  • Digital tank-level monitoring system with level alarms
  • GPS with Chart plotter
  • Horn
  • Magnetic Compass 1
  • Multi-function Speed and Depth Display
  • Navigation lights
  • VHF (DSC) radio

Interior Outfitting

  • Covered, insulation ceiling panels
  • Shelf space, hanging lockers and storage drawers
  • Single bunks complete with mattresses 6
  • Electric toilet
  • Stainless steel towel rail
  • Vanity cabinet with mirror
  • Wash basin
  • White GRP moulded finish to modules with CORIAN type counter surfaces
  • Convection Microwave oven
  • CORIAN type work surfaces
  • Drawer-type refrigerator
  • Pressurized hot and cold water
  • Stainless steel sink
  • Adjustable, heavy duty suspension helm seat 1
  • Central steering position with machinery controls and vessel monitoring system
  • Heavy duty suspension seats for crew 3
  • Stainless steel handrails and Grabrails
  • Windscreen sun-blinds
  • Chart table/navigation area with chart and admin equipment storage
  • Heavyduty suspension seats for crew 2
  • L-shape settee with drop-leaf dining table
  • Ribbed non-slip matting
  • Stainless steel handrails and Grabrails
  • Windscreen sun-blinds

Exterior Outfitting

    STAINLESS STEEL, Grade 316
  • Grab rails on coachroof top and cockpit surround
  • Heavy duty rub-rail all round
  • Self-draining cockpit and forward weapons station with gutters and stainless steel covers
  • Stainless steel mooring cleats 10
  • Stainless steel stern warp/towing rope fairleads with rope bin 2
  • Stemhead fitting and associated hawse pipe for anchor stowage 1
  • Electric windlass 1
  • Radar/antenna arch 1
  • Water access boarding ladder 1
  • Windscreen wiper 1
  • 25Kg Anchor with 50M Hi-test galvanized chain
  • Dock lines and Fenders
  • Basic safety equipment: Flare set, 10 x life jackets, Basic first aid kit
  • All GRP components (interior and exterior) finished with as-moulded, white gelcoat
  • All interior floors, ribbed non-slip matting
  • All underwater surfaces (except hydrofoils, rudders and propellers) primed and finished with proprietary anti-fouling paint
  • Crew cabins painted with solvent-free, polyurethane paint
  • Stowage and machinery spaces painted with waxed, gel resin
  • Washroom and galley all gloss, white GRP finish