Badged a Gunboat 57, HAMMER features a transom extension of 2 feet on the Gunboat 55 hull, creating a larger swim and boarding platform, and increased speed with waterline length.
The original design specification for the Gunboat 55/57 was to offer a performance cruising catamaran that could be owner driven and not require pro crew like the Gunboat 60, 62 and 66 models. The bridge deck is very social with its galley up design. All entertaining, meals and relaxing are done on the same level. In the middle of this is the steering station with all sailing controls led to the helm.
HAMMER'S build brief was for a high-performance family cruising yacht with a functional sail plan for the light air conditions common in the Chesapeake during the summer months and trade winds of the Caribbean in winters.
HAMMER can match the wind speed in 6-10 knots of true wind. HAMMER'S additional tankage extends her steaming range to over 1300 nautical miles for passage making when sailing conditions are not optimal.
HAMMER is the premier example of the Gunboat 55'/57' series boasting superior performance over the others, come and see for yourself.
- Epoxy infused carbon fiber monocoque construction
- Corecell closed cell foam coring
- Hull finished in Alexseal Kingston Grey Linear Polyurethane
- Deck and superstructure finished in Alexseal Cloud White Linear Polyurethane
- Bottom finished in Black Petit Vivid ablative
- Sacrificial "false" bow and forefoot offer impact protection
- Cavernous bow lockers with ample storage
- Six flush mounted Lewmar deck hatches
- Hi-load tempered tinted glass windows
- Large opening hatch above helm station
- Seadeck main deck
- Flexi Teak in Main Salon/Galley
- Flexi Teak on aft steps/sugarscoops
- Carbon Fiber Rudders
- Rudder bearings serviced, fall 2025
- Carbon fiber centerboards (Min draft is 3’ with centerboards up, and 13’ with centerboards down.) Centerboards removed, bearings replaced, trunks cleaned and serviced fall 2025
- Six Nomen retractable cleats
- Two round opening escape hatches inboard port and starboard
- Fixed acrylic hull ports allow natural light throughout
- Integral davits for tender storage
- Mast pulled and inspected Nov 2025
- Shroud loops replaced Nov 2025
- Forestay replaced fall 2025
- Marstrom Carbon Fiber Mast (92’ air draft)
- Marstrom Carbon Fiber Park Avenue Boom
- New standing rigging (6/2024)
- Marstrom Alloy Longeron
- Composite standing rigging KZ Racing code furler
- KZ Racing A3 furler
- Facnor solent furler
- EC6 Diamond titanium end fittings replaced Nov 2025
- Harken Hydro-Two hydraulic power pack
- Two Harken racing two speed winches at helm
- Nine Spinlock rope clutches located at helm
- Hydraulic push button main sheet with emergency release
- Two Harken winches located on mast, one Hydraulic, one manual
- Eight Spinlock rope clutches located on mast
- Lewmar V5 24/ Hydraulic windlass
North Sails Inventory
- 3Di Endurance Mainsail with 3 reefing points (1436 sq. ft.) new Nov 2025
- 3Di Solent (598 sq.ft.) new Nov 2025
- A3 asymmetric (3012 sq. ft.)
- Code 0 (1522 sq. ft.) new Nov 2025
MAIN SALON
- Spacious bridge deck salon/galley
- Finished in Kingston Grey Alexseal with Cloud White overhead
- Tempered glass windows forward, port and starboard
- Isin glass removable aft curtains
- Pressed Polyvinyl curtains aft to port and starboard
- Plasti-Teak sole throughout (2022)
- Starboard settee with seating for four
- Custom Dinette table in Maple and carbon fiber
- Large athwartship seating aft accommodates six
- Main Salon transitions seamlessly into galley
GALLEY
- Galley up configuration offers exceptional visibility
- Black Corian countertops throughout
- Large island located in center of bridge deck
- Miele 4 burner propane stove
- Thermador combination convection/microwave oven
- Dual SS Suter Inox Dual undermount sinks
- Dual Hansgrohe Axor Starck faucets in chrome
- Ample storage outboard below counters
- Ample storage below center island
HELM and NAV STATION
- Finished in Kingston Grey Alexseal/Overhead finished in Cloud White
- Winch island with all sail handling controls led to the helm
- Custom carbon fiber helm pedestal
- Jeffa Y-spoke carbon fiber steering wheel
- B&G Zeus 12' Multifunction Chart plotter
- B&G 4G radar
- Two B&G Autopilot units
- Four B&G H5000 race displays VHF radio
- Auto Anchor windlass control/chain counter
- Push button daggerboard controls
- Push button lighting controls
- Two Yanmar engine control panels
- Stidd custom helm seat in brown saddle leather
PORT PANTRY/UTILITY SPACE
- C-ZONE digital switch panel for all AC and DC consumers
- Black Corian countertops throughout
- Vitrifrigo DW 180 refrigerator
- Vitrifrigo DW 360 upper/lower refrigerator/freezer drawers
- Five large storage drawers with push button latches
- Eight storage lockers with push button latches
- Fixed acrylic transom port aft
- Fixed acrylic hull port outboard
- Lewmar overhead flush mount hatch
- Oceanaire screen/shade over hatch
- Fireboy fire suppression manual release
- 110 V outlets
PORT VIP STATEROOM
- Maple interior cabinetry finished in satin Alexseal Cloud White paintwork throughout
- Queen berth located inboard
- Large acrylic hull port
- Lewmar flush mount hatch
- Oceanaire screen/shade
- Two white Calafumo ventilation fans
- Cruisair AC controller
- Two gooseneck reading lamps over berth
- Large storage drawers below berth
- 110V outlet adjacent to berth
- 12V outlet adjacent to berth
PORT VIP HEAD
- Maple interior cabinetry finished in satin Alexseal Cloud White paintwork throughout
- Black Corian countertops
- Cantrio Koncepts SS undermount sink
- Hansgrohe Talis S faucet in chrome
- Three large storage lockers with pushbutton latches
- Large storage drawer with push button latches
- Twin Mirrored vanity doors over sink
- Planus electric fresh water head
- Lewmar flush mount hatch
- Oceanaire screen/shade
- 110V power outlet
- Large stand-alone shower finished in Cloud White
- Fixed acrylic hull port
- Hansgrohe Raindance S100 Air shower head in chrome
- Hansgrohe S Thermostatic in chrome
- Hansgrohe Unica S wallbar in chrome
- 110V outlet
PORT BOW LOCKER
- Cloud White Alexseal finish throughout
- Access door from shower
- Watertight collision bulkhead
- Storage shelving
- Tie downs for securing gear
- 12V LED lighting
GUEST STATEROOM, STARBOARD
- Maple interior cabinetry finished in satin Alexseal Cloud White paintwork throughout
- Queen berth located aft
- Large acrylic fixed transom port
- Acrylic fixed hull port
- Lewmar flush mount hatch
- Oceanaire screen/shade
- Two gooseneck reading lamps over berth power outlet
- 12V power outlet
GUEST HEAD, STARBOARD
- Maple interior cabinetry finished in satin Alexseal Cloud White paintwork throughout
- Black Corian countertops
- Scanvik SS undermount sink
- Hansgrohe pullout faucet/shower head combo
- Planus electric fresh water head
- Custom shelving above sink
- Shower curtain
OWNER STATEROOM, STARBOARD
- Maple interior cabinetry finished in satin Alexseal Cloud White paintwork throughout
- Queen berth located inboard
- Large acrylic hull port
- Lewmar flush mount hatch
- Oceanaire screen/shade
- Two white Calafumo ventilation fans
- Cruisair AC controller
- Two gooseneck reading lamps over berth
- Large storage drawers below berth
- 110V power outlet 12V power outlet
OWNER HEAD, STARBOARD
- Maple interior cabinetry finished in satin Alexseal Cloud White paintwork throughout
- Black Corian countertops
- Cantrio Koncepts SS undermount sink
- Hansgrohe Talis S faucet
- Three large storage lockers with pushbutton latches
- Large storage drawer with push button latches
- Twin Mirrored vanity doors over sink
- Lewmar flush mount hatch Oceanaire screen/shade
- 110V power outlet
- Large stand-alone shower finished in Cloud White
- Fixed acrylic hull port
- Hansgrohe Raindance S100 Air shower head in chrome
- Hansgrohe S Thermostatic in chrome
- Hansgrohe Unica S wallbar in chrome
STARBOARD BOW LOCKER
- Alexseal Cloud White paintwork throughout
- Access door from shower
- Watertight collision bulkhead
- Storage shelving
- Tie downs for securing gear
- 12V LED lighting
- Fuel: (2) 75 gal PE main tanks, (2) 72 gal PE forward tanks
- Water: (2) 49 gal PE tanks
- Holding: (2) 29 gal PE tanks with pumpout
- (2) Yanmar 3-JH 39 HP Main Engines (NEW 2023/200 hrs)
- Dual Racor Duplex 500MAM30 secondary filters
- Oberdorfer N991 fuel transfer pumps
- Hurth V-drive marine gears
- Harken Hydro 2 power pack for mainsheet, daggerboard winch and windlass control
- Three Harken Performa 65 STR HY three speed winches at helm
- Lewmar V5 24V windlass
- 70 AMP alternator for 12V start banks
- 140 AMP alternator for 24V house bank
- Two Dometic/Cruisair EQ 12 12,000 BTU condensers
- Four Dometic/Cruisair TVE 6 6,000 BTU evaporator units in staterooms/Main salon
- Spectra Newport 400 water maker
- Pressurized domestic water system
- Sound down vibration dampers on all freshwater pump
- Fresh water wash down forward
- Hot and cold shower on port sugar scoop
- Grey water Y-valves from showers to holding tanks/overboard
- Y-valve at aft head to holding tanks/overboard
- Jeffa Steering System
