Engine
CAT 3512B E-rated
Total Power
-
Engine Hours
-
Class
Motoryacht
Length
49.99m
Year
2011
Model
CUSTOM
Capacity
-
Northrop & Johnson Yachts
Boat Details
Description
Launched in 2010, IMPROMPTU was built to a very high, custom specification with a stunning interior by renowned designer Patrick Knowles. The yacht underwent a refit in 2022 & 2025, which included a full Awlgrip paint job, an extensive A/V and Wi-Fi upgrade, a new ASEA shore power converter, and a new sewage treatment plant. She completed her 15-year ABS survey in 2025, leaving her in excellent condition. IMPROMPTU boasts an impressive charter history.
Twelve guests will spend restful nights in IMPROMPTU’s six beautifully appointed staterooms. Her versatile layout comprises a split-level master stateroom with king-size bed and dedicated his and hers ensuites on the main deck and an elevated lounge with impressive 180-degree views. On the bridge deck, a VIP queen stateroom is flooded with natural light thanks to large windows. On the lower deck, her accommodations consist of three King staterooms and a twin stateroom with Pullman, all complete with desk areas and shower en-suites.
IMPROMPTU’s main salon features an open-plan seating area with dining forward for 12 guests. A grand, centrally located spiral staircase features a dedicated wine cellar at the top of the stairs. The main deck aft showcases a raised conversation area with plentiful seating and air conditioning if desired. A dual staircase leads down from the main deck aft to an oversized swim platform and tender/toy garage. IMPROMPTU’S skylounge is dedicated to guest entertainment, with an L-shaped sofa to port, a generous bar with seating, a 60” television and a game table. For alfresco dining, guests can head to the bridge deck aft and join around the circular dining table for twelve. Further aft is additional seating to further conversation after a delightful meal.
IMPROMPTU’s spectacular sundeck is the ultimate place for friends and family to gather together. The showcase of this incredible sundeck is her custom, raised waterfall Jacuzzi for 12 guests with beautiful tilework and steps for entering on both sides. The space is further enhanced by a large outdoor bar with seating for five, a barbecue and a dayhead. Guests can also enjoy meals under the stars thanks to a large dining table. The sundeck is rounded out both forward and aft by chaise loungers, an oversized sunpad, and built-in seating areas, all with umbrellas for shade on the sunniest of days.
IMPROMPTU effortlessly combines timeless elegance and comfort to create the perfect environment for the owner and their guests to make unforgettable memories.
Contact Information
Other Details
SPECIAL FEATURES
1. 15-year ABS survey completed 2025.
2. Full Awlgrip HDT paint-job completed 2022.
3. Accommodations for 12 guests in 6 beautifully appointed staterooms, including an on-deck, split-level master with dedicated his and hers en-suites, a VIP queen stateroom on the bridge deck, three additional king staterooms, and a twin stateroom with Pullman berth.
4. Sun deck features a custom, waterfall pool for 12 guests, dayhead, L-shaped bar, BBQ, large alfresco dining table, and plentiful sunpads and lounging areas.
5. Significant A/V and wifi upgrade in 2022.
6. Main Engines 10,000 hour service completed 2025
7. Generators 2,000 hour service completed in 2025
8. Tender garage and bow tender storage ensure the guest areas are fully dedicated to guest use only.
CONSTRUCTION
- Aluminum, semi-displacement hull
- Teak decks throughout
- Awlgrip HDT complete paint job 2022
Accommodations
IMPROMPTU sleeps 12 guests in 6 beautifully appointed staterooms.
Master Stateroom: main deck forward, full-beam: Split-level with King size bed on the main deck and private lounge forward Private study at entrance with desk His and hers dedicated en-suites, his with a shower, hers with a jacuzzi, vanity, and adjacent walk-in closet VIP Stateroom: bridge deck, aft: (1) x Queen berth with en-suite shower (4) x Guest Staterooms, lower deck, amidship: (2) x King staterooms, port and starboard aft, with en-suite showers and desks (1) x King stateroom, forward with en-suite shower (1) x twin stateroom with Pullman berth on port side, en-suite shower and desk
Crew
Accommodations for 9 crew, including Captain's cabin on bridge deck
Dimensions
General
- Length overall: 164' (50m)
- Length at waterline: 147' (45m)
- Beam: 28' (8.5m)
- Draft Minimum: 8'6" (2.59m)
- Draft Maximum: 8'10" (2.69m)
- Gross Tonnage: 490
- Net Tonnage: 147
- Displacement (light ship): 284.14LT
Capacities
- Fuel Capacity: 17,500 US Gallons (66,238 liters)
- Water Capacity: 2,600 US Gallons (9,841 liters)
- Watermakers: (2) x 2,500 US Gallons/day; 5,000 total/day (9,463 liters/day)
- Lub Oil: 248 US Gallons (939 liters)
- Dirty Lub Oil: 280 US Gallons (1,060 liters)
- Grey Water: 1,610 US Gallons (6,132 liters)
- Black Water: 426 US Gallons (1,650 liters)
Speeds
- Maximum speed: 18.5 knots
- Cruising speed: 16.5 knots
- Economical speed: 12 knots
MACHINERY
Main Engines
- Engine Type: (2) x CAT 3512B E-rated 10,000 hour service completed in 2025
- Engine Hours (as of 4/2025):
- Starboard: 0 hours (Completely rebuilt in 2025 at 11,837 hours)
- Port: 0 hours (Completely rebuilt in 2025 at 11,837 hours)
- Gearboxes: Reintjes WVS 730/1 K12 Ratio 3.047:1 / Full rebuild in 2023
- Shafts & Propellors: Michigan wheel, Nibral CX-500, 5-blade, 56" x 55" pitch
Generators
- Generators: (2) x Northern Lights 130 Kw, 1800 RPM 2,000 hour service completed in 2025
- Generator Hours (as of 4.2025)
- Starboard: 3,054 hours (Full Rebuild at 28,312hrs in 2023, 2,000 hour service in 2025)
- Port: 2,847 hours (Full Rebuild at 29,310hrs in 2023, 2,000 hour service in 2025)
- Electricity: 120v L&N
- Shore Power: ASEA 150 kVA AC150LC-3/2-S (New 2022)
- Batteries:
- Main engine starting: 12 x 12V AGM Odyssey PC1800-FT 1300 (New 2021)
- Generator starting: 12 x 12V AGM Odyssey PC 1800-FT 1300 (New 2022)
Air-Conditioning
- Type: Dometic, 4-stage 50-ton plant (New 2021)
- 2 speed compressors and titanium condensors
Additional Machinery
- Stabilizers: Quantum QC-1500 E-M1, Zero-Speed Major Service 2022
- Watermakers: (2) x Neptune MWM-252635 FCI
- Bow Thruster: Quantum QT 150, 150 hp
- Steering System: EMI Model DE03 Dual, 3hp
- Rudder Angle Indicator: Sperry
- Fuel Filtration: Alfa Laval MAB 103, 300 GPH 208 VAC 3-PH
- Fuel Filters: Racor 2010 PM
- Sewage System: Headhunter (New plant 2022)
- Ventilation: Heinen Hopman
NAVIGATION EQUIPMENT
- GPS: Furuno GP-150
- GPS Automatic Pilot: C-Plath Navipilot 4000
- Radar: X-Band Furuno FR- 2127BB 25kw
- Chart Plotter: Transas 4,000, Nobeltec
- Magnetic Compass: C-Plath NavigatxMK2 with PG1000 Fluxgate
- Gyro Compass: C-Plath NavigatxMK2 with PG1000 Fluxgate
- Echo Sounder: Furuno
- Wind Instruments: Furuno
ENTERTAINMENT EQUIPMENT
- Player Piano: George Steck Acoustic Piano with Player System ; QRS PN03, latest version (Main Salon entrance)
- Main Salon: 42" Television
- Skylounge: 60" Television
- Master Stateroom: 42" Television
- VIP Stateroom: 31" Television
- Starboard Aft, Port Aft, Starboard Forward Staterooms: 31" Television
- Port Forward Stateroom: 21" Television
- Outdoor theater with surround sound
- Apple TV
- DirecTV Satellite TV
- Kaleidescape central movie server
- iPod connections
- Xbox
- Airplay
COMMUNICATION EQUIPMENT- GMDSS EQUIPPED
Communication System
- Internet:
- 2x Starlink
- K4 Edge Server(New 2022)
- K4 HTS Modem & Swith assembly (New 2022)
- Internal network with 15x wireless access points (New 2022)
- VSAT:
- Intellian V100NX 8wBUCVSAT System (New 2022)
- Intellian S100HD WorldView HDTV Multi-Feed & WorldView Trio LNBn (New 2022)
- K4 LTE Onedome antennae (New 2022)
- VHF Radiotelephones:
- Furuno FM8800 S with DSC
- Telephone System:
- Panasonic
DECK EQUIPMENT
- Anchor Windlass: Muir VRC 1100, hydraulic Rebuilt 2025
- Aft Warping Capstans: Muir VC 4000, hydraulic
- Boat Crane & Davits: Nautical Structures Overhead SL4000-DEX 223-316 Serviced 2022
- Passerelle: 2 x Marquipt Superfold, hydraulic (stern)
- Side Boarding Ladder: 2 x Marquipt, aluminum, folding
- Searchlight: Carlisle & Finch 200X Xenon
SAFETY & SECURITY EQUIPMENT
- Fire-Fighting: Fire Detection; Edwards E-FS502R, 5-Zone
- Alarms: Servowatch
- Security:
- CCTV Bosch
- (6) x cameras
- (2) x displays
- Ship's safes:
- (1) x Master Stateroom
- (1) x Captain's Cabin
TENDERS & TOYS
Full list to be provided at the time of a fully executed Agreement.
REFIT 2025
Main Engines – Cat3512
- Full In-Frame overhaul
- New Motor mounts, Alignment and chock fasted
- Service/Replace Starters
- Service/Replace Alternators
- Replaced all start Batteries
- New Exhaust Lagging for Turbo’s and flower pot
Gearboxes
- Oil change and service
- Visual Inspection by ABS for Special Survey
- New Gearbox Mounts, Alignment and chock fasted
Generators
- 2000 hr. service
- New mounts
- New diodes and bearings for electrical end
- Megger test for Special ABS Survey
Sewage treatment plant
- Fwd., Main and Aft grey pumps have been re-built
- Fwd., Main and Aft Black pumps have been re-built
- All sensors have been re-calibrated
- All ozone generators for all black and grey tanks have been replaced
- Fwd. black and grey tank have been re-coated
- Main Grey tank has been patched with Belzona and repainted as per ABS Special Survey
Stabilizers
- Lower seals have been replaced
- Stabilizers have been serviced
- One ram has been replaced
Bilge/Fire system
- Fire pump has been re-built
- Bilge pump has been re-built
- Emergency Diesel fire/bilge pump is new
- Bilge Manifold has been re-built
- Bilge solenoids have been replaced with new
- All bilge lines have been replaced
- All air valves associated with bilge system has been serviced
- All foot valves have been serviced/replaced
Overboard Valves
- All Overboard Valves have been serviced/replaced and Inspected by ABS
Batteries
- All Start, House, Emergency and crane Batteries have been replaced
Oily water separator
- OWS meter has been replaced
- OWS has been serviced.
Monitoring System
- The Monitoring system has been replaced with Boening Hardware
- All HMI have been replaced
- All computers have been replaced
- All sensors have been serviced/replaced
Water Maker
- All low-pressure hoses have been replaced
- Low pressure pumps have been re-built
- High pressure pumps have been replaced
- Membranes have been replaced
- High pressure plumbing has been inspected/replaced
Fresh Water System
- Fresh water tank bottom shell plating has been replaced
- Fresh water common wall has been replaced
- Fresh water tanks have been coated
- Hot water tanks have been serviced
- Hot water circulation pumps have been replaced
- All freshwater filters have been replaced
- All UV lights have been replaced
- All tanks have been calibrated
Compressed Air System
- Forward Compressor has been replaced
- Aft compressor has been re-built
- The air dryer has been replaced
- All oily/water filters have been serviced/changed
Steering System
- Steering rams have been re-built
- The steering system has been serviced
- Low level sensors on hydraulic tanks have been replaced
Shafts and Propellers
- Shafts and props have been inspected as per ABS special survey
- Stern Tubes Replaced
Tanks
- All fuel tanks have been Inspected by ABS
- All sewage tanks have been inspected by ABS
- All freshwater tank have been inspected by ABS
Switchboard
- Switchboard has been cleaned and serviced
- Switchboard has been tested as per ABS special Survey
New/Used oil system
- Use oil pump has been re-built
Fuel System
- Alpha Laval fuel purifier has been re-built
- High Voltage transfer pump has been re-built
- All fuel/air valves have been serviced
- All fuel tanks have been Calibrated
Galley
- All dishwashers have been serviced
- All laundry equipment has been serviced
- Ovens have been serviced and over temp sensors replaced
- Stove top has been serviced
- Galley range hood has been professionally cleaned
- All fridges and freezers have been serviced
Hot Tub
- Hot tub has been completely re-plumbed
- All pumps and filters have been replaced
- Insta hot water has been added so water is heated as it is filling
- All controls have been replaced
- New tile work
- New teak surround
- All tiles re-grouted
A/C System
- All condensers have been cleaned
- A/C plant has been serviced
- Guest and crew fresh air make-up’s have been replaced with new
- All Air handlers have been professionally cleaned
ABS Special 15 year Survey
- ABS special survey has been passed
EXCLUSIONS
A detailed list of exclusions will be provided at the time of a fully executed Agreement.
Disclaimer
Specifications and details of this vessel are provided in good faith for informational purposes only. Data regarding the specifications, operating characteristics and condition of the vessel was obtained from sources believed reliable but is not guaranteed by owner or brokers. Buyer assumes responsibility to verify all speeds, capacities, consumptions and other measurements contained herein and otherwise provided and agrees to instruct his agent or surveyor to confirm such details prior to purchase. Vessel is offered subject to prior sale, price and inventory changes and withdrawal from market without notice.
Engine hours are as of the date of the original listing and are a representation of what the listing broker has been told by the owner and/or actual reading of the engine hour meters. The broker cannot and does not guarantee the true hours. It is the responsibility of the purchaser to verify engine hours, warranties implied or otherwise, and major overhauls as well as all other representations noted on the listing brochure.
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Propulsion
Engine 1
Engine Make:CAT
Engine Model:3512B E-rated
Engine Type:Inboard
Fuel Type:Diesel
Engine 2
Engine Make:CAT
Engine Model:3512B E-rated
Engine Type:Inboard
Fuel Type:Diesel
Specifications
Speed & Distance
Cruising Speed:16.5kn
Max Speed:18.5kn
Range:3600nm
Dimensions
Length Overall:49.99m
Beam:8.53m
Miscellaneous
Hull Material:Aluminium
Tanks
Fresh Water Tank:
Fuel Tank:
Holding Tank:
Accommodations
Guest Cabins:6
Guest Heads:8
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