Catalyst | 2004 Alwoplast Crowther Catamaran

New Orleans, LA, US

Catalyst | Alwoplast Crowther Catamaran 50ft

US $410,000

New Orleans, LA, US


Catalyst is a 40' Crowther designed custom power catamaran built by Alwoplast - a proven, smart combination. She offers unparalleled cruising flexibility with a 3,000 nm range, a shallow draft, & a relatively narrow beam that allows her to fit into more slips. Ideal for Bahamas, Keys, or Great Loop.


  • Length: 50ft
  • Beam: 20' 0"
  • Draft: 4' 8"
  • Year: 2004
  • Hull: Composite
  • Speed: 25
  • Status: Active

View More Specs



  • Length Overall: 50 ft
  • Max Draft: 4' 8"
  • Bridge Clearance Measure: 18' 5"
  • Beam Measure: 20' 0"
  • Range Measure: 3452.34 mi


  • Total Power: 900
  • Engine Brand: Caterpillar
  • Engine Model: 3126B
  • Engine Type: Inboard
  • Engine/Fuel Type: Diesel
  • Engine Power: 450 hp

  • Total Power: 900
  • Engine Brand: Caterpillar
  • Engine Model: 3126B
  • Engine Type: Inboard
  • Engine/Fuel Type: Diesel
  • Engine Power: 450 hp


  • Fresh Water Tanks: 1 (433 Gallons)
  • Fuel Tanks: 3 (433 Gallons)


  • Number of cabins: 2
  • Number of heads: 2

50′ Alwoplast Overview

50′ Alwoplast Description

Catalyst is a well-maintained, Crowther designed custom power catamaran built by Alwoplast in 2004.  She offers a 2-1/2 stateroom, 2 head layout (with the master stateroom on the pilothouse deck),  Caterpillar 3126b main engines, water-maker, and a recent bottom job.  Catalyst offers incredible flexibility in her range, beam, and draft.  A lightweight hull with optimally designed hydrodynamics, she brings a 3,000 nm range at trawler speed or a 17 knot faster cruise. Seller reports a 6gph fuel burn at 8kts and 28gph fuel burn at 17kts.  Another part of that unique design is her relatively narrow 20ft beam – allowing her to fit into many monohull slips, minimizing the need to find a double slip, compared to typical catamarans.  Her shallow draft makes her ideal for the Bahamas, Keys or Great Loop cruising.  Catalyst offer a vessel with an air draft less than 19.5ft making it possible to cruise the Great Loop. This bluewater or coastal cruising flexibility make her a great all-around cruising option.

Crowther power cat design experience + Alwoplast build quality is a proven combination for a smart, efficient, and dynamic power catamaran.

50′ Alwoplast Vessel Walkthrough

Entering the interior through the sliding glass doors from the covered aft deck, you will find a dinette with pull out stools starboard aft, pull-out liquor/wine cabinet to starboard, stairs to the guest stateroom starboard forward, stairs to the pilothouse forward, a laundry/ food pantry  port forward and the galley port aft.  Once in the pilothouse, the stairs to the flybridge are starboard aft, lower helm starboard forward, master stateroom entrance forward and salon with two lounge chairs, convertible couch/bunk, and entertainment center to port.  There are side deck access doors on each side.  Once inside the master stateroom forward, a full size walk in shower and sink is to starboard. In the port hull forward is ahead and sink. Aft in the foreword port hull is an “office” of single bunk room. In the starboard hull ending from the dinette area is a guest head, room with queen size bunk and full size shower.

The spacious engine rooms are accessed via two deck hatches in the aft deck.

50′ Alwoplast Accommodations

This Alwoplast 50 offers a master stateroom forward on the main deck with a centerline king size berth and ensuite head and shower and then a guest stateroom with a queen size berth and ensuite head and shower. The “office” room in the port hull offers a single bunk, and the covetable couch in the main salon offers another single bunk.

50′ Alwoplast Salon

The salon offers two lounge chairs and couch/bunk, entertainment center forward, port side deck access door, Brazilian hardwood sole, Majilite Ostrich wall covering and an open wall to the galley aft.

50′ Alwoplast Galley

  • The galley is located port aft on the main deck.

  • LG 23in by 68in 120vac refrigerator/freezer (Can run off inverter)

  • GE stainless steel microwave oven

  • Force 10 stainless steel 4-burner LP gas cooktop and oven

  • Broan trash compactor

  • Miele G832 SC dishwasher

  • In-Sink-Erator instant hot water dispenser

  • Double stainless steel sinks

  • Granicoat countertop

  • Stainless steel ice maker on the flybridge

  • Force 10 stainless steel BBQ grill on the flybridge

  • Nucore Mahogany Sole

50′ Alwoplast Dining

Dining space is available at the built-in dinette with pull out stools across from the galley,  and also removable tables on the flybridge.

50′ Alwoplast Master Stateroom

The master stateroom is located forward of the salon and pilothouse and offers a centerline king size berth, reading lights, nightstands, 4 overhead hatches, side windows, hanging lockers, walk-in closet, storage drawers, shelf, carpet, enclosed shower and vanity to starboard, head to port and a large office port aft.

50′ Alwoplast Guest Stateroom

The guest stateroom is located to starboard and offers a queen size berth, reading lights, shelf, hanging locker, storage cabinet, 2 portlights, Majilite Ostrich wall covering and separated head and shower.

50′ Alwoplast Laundry

The laundry room is port forward of the galley and offers a 110V vented Splendide 2100 combo washer/dryer, built-in ironing board and storage space.

50′ Alwoplast Pilothouse

The pilothouse offers a lower helm starboard forward, starboard side deck access door, stairs to the flybridge starboard aft, Todd helm seat and an L-shaped benchseat that converts to a watch berth.

50′ Alwoplast Flybridge

The enclosed flybridge is accessed via internal stairs from the pilothouse or a vertical stainless steel ladder aft from the covered aftdeck.  There is a full helm forward, Todd helm seat, built-in L-shaped benchseat with storage and removable tables to starboard, a wetbar with stainless steel sink and icemaker, storage and Force 10 stainless steel BBQ grill to port, Plasteak deck and canvas enclosure aft to the boat deck.  2 hatches on the flybridge roof provide additional airflow.

50′ Alwoplast Aftdeck

The covered aft deck offers a built-in bench seat wet bar with stainless steel sink and top loading CoolBlue 12v cold plate freezer, fishing rod rod holders, stainless steel ladder to the flybridge, Canvas enclosures on the sides and aft, sliding doors to the interior and access to each swim platform and side deck.

50′ Alwoplast Audio/Visual Equipmen

  • Samsung flat screen TV in the salon

  • LG DVD player in the salon

  • Samsung TV in the master stateroom

  • Panasonic TV/DVD player in the guest stateroom

  • Sony Pioneer Bluetooth AM/FM/CD player in the pilothouse

  • Sony interior speakers throughout boat

50′ Alwoplast Electronics

  • Standard Horizon Spectrum + VHF at the lower helm and on the flybridge

  • Ritchie Powerdamp magnetic compass at the lower helm and on the flybridge

  • Raymarine ST6001+ autopilot controls at the lower helm and on the flybridge

  • Raymarine ST60 wind, speed and depth gauges at the lower helm

  • Garmin 541s chartplotter/ depth sounder on the flybridge

  • Raymarine ST60 Tridata gauge on the flybridge

  • Raymarine RL80C Pathfinder Radar at the lower helm

  • Weems & Plath clock, barometer and tide clock in the salon

  • Docking port with external antenna for GlobalStar Satellite phone

50′ Alwoplast Electrical System

  • Phasor 12.5 kW generator with 800 hours

  • Xantrex 3000 watt inverter and remote panel

  • Blue Sea electrical panels

  • 50 amp shore cord


50′ Alwoplast Engine/Mechanical Equipment

  • Each engine room is accessed via aftdeck hatches and are insulated with Soundown vinyl foam.

  • Twin Caterpillar 3126B 450 hp main engines with 3300 hours

  • ZF gearboxes

  • Dual Racor 500FG fuel filters for each main engine

  • Racor 500FG fuel filter for each generator


  • Hynautic hydraulic steering system

  • Bennett trim tabs

  • 2 16,000 BTU Mermaid reverse cycle air conditioning/heating systems

  • 1 12,000 BTU Mermaid cool only air condition with separate raw water pump

  •  Raritan 12 gallon water heaters

  • Vantage Marine Aqua Systems 20gph watermaker

  • Jabsco electric heads

  • 2 X Hart Systems Tank Tender tank level monitors

  • 170 Gallon Water Capacity

  • 3 fuel tanks, 800gal main tank 2x 250gal wing tanks for a total of 1300gal diesel


50′ Alwoplast Deck Equipment

  • Lewmar anchor windlass with foot controls and remote controls at upper helm

  • Danforth 35lb spare anchor and rode

  • Mantus 85lb anchor

  • 100′ 10mm anchor chain and approx 200ft nylon rode

  • 4 Foredeck storage lockers 

  • Foredeck rail seats

  • Foreward deck: Non-skid

  • Aft Deck: Faux Teak Deck replaced with 5 mil solid fiberglass sheet w Awlgrip Non-skid

  • Boarding gates on each side deck

  • Marquipt Tide Ride gangway

  • Stainless steel deck hardware

  • Stainless steel rails

  • Stainless steel swim ladder

  • Window covers

  • Fresh water washdown

  • Hot/Cold fresh water shower on the swim platform

  • Dock water connection

  • Hurley under water lights

  • White exterior painted 2013, blue section painted 2012

  • 2 X Worthington 20lb propane tanks in a dedicated storage cabinet

50′ Alwoplast Dinghy

  • Marquipt 1500lb lift

50′ Alwoplast Safety & Fire Protection

  • Go light searchlight

  • Lifesling Man Overboard Retrieval system

  • McMurdo EPIRB

  • Whale gulper 220 bilge pumps

  • 7 X Fire extinguishers

  • Engine room fire suppression systems

  • Trident gas control panel in the galley

50′ Alwoplast Exclusions

  • Sellers’ personal belongings and tools

50′ Alwoplast Items Non-Operational / In need of attention

  • Majilite Ostrich wall covering in salon sagging in sections

50′ Alwoplast Vessel History

  • Bahamas / owners

The current owner purchased the vessel from the original owners who had the boat built in 2004. The current owners underwent a major replacement/reconfiguration of  all systems on the vessel to bring them to working order. A detailed list with dates is available but the highlights are:



Added GFCI and outlets where needed (the original setup had one outlet in the galley serving the entire stern of the boat).

AC ducts added into the pilot house.

Macerator pumps changed and replumbed, Holding tank vents cleared.

Fresh water tank leak repaired

Oil change pumps added to main engines

Pioneer Stereo added

Extra lighting added to galley and dinette area

Cabling replaced on Marquipt hoist

TankTender system repaired

Added circuit breaker for AC raw water pump, (was hidden fuse)

Rewired shore power for 240v 50amp replacing the 125v 50amp and 30amp circuits.

Replumbed AC condensate pump.

Replaced thru hulls

Replaced Norcold refrigerator to LG

Repaired freshwater system


Replaced Fisher Panda generator with new 12.5kw Phasor Generator

Added 3rd AC unit in Galley/dinette area

Added couch/bunk in salon

Replaced windlass relays

Replaced toilet valves

Replaced front head flooring

Replaced “dripless” shaft logs with conventional packing glands

Replaced underwater lights

Added Hynautic shift controls on stern

Added second generator (Westerbeke)

Replaced plow anchor to Mantus 85lb

Replaced 12v freezer thermostat


Replaced shower port light

Replaced house battery system

Replaced aft Mermaid 16k BTU AC


New Ice maker


Awlgrip paint (off white color) on decks

Replaced anchor chain and rode

Replaced fake teak material in cockpit with 5mm fiberglass plate. Awlgrip paint

50′ Alwoplast Comments

With international acclaim in catamaran building from decades in production, starting in 1987, Alwoplast built superior custom catamarans, both power and sail.  Their image depicts their commitment to engineering excellence and quality interior detail.

Catalyst has appeared in past issues of PassageMaker Magazine and MultiHulls Magazine and appeared in a trawler forum blog: “I think Alwoplast had a 50′ or so power cat at the Miami Show once…very impressive.  I think Crowther also designed the Barbara Mae, a beefy 50-60′ or so power cat that struck me as one of the nicest designs yet.  If I had the money to throw at a new Cat build, Alwoplast would be in the running.” 

50′ Alwoplast Disclaimer

The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.





The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.


Request More Information

  Add to Favorites

  Receive Updates


Open Close

 More Information

Recent News

We take pride in our happy customers

Your team delivered on every mark. You’ve got an amazing broker in Mark Wattrus and I’m confident you will have continued success moving forward together. He was available 24/7 whenever I had questions. We had a great initial visit on the boat and his marketing plan and photos were superb

— Jimmy

I bought a yacht that I had never seen. I did this because I trusted my broker Andrew Holland. It was not an easy job for Andrew, as I am an experienced boat builder and owner of previous yachts, but work in West Africa. Imagine how hard it was to communicate what I was looking for. Andrew came up with exactly what I wanted. He dealt with time delays, all my questions at odd hours, and was there for the survey. He reported honestly and professionally. After buying the yacht, I arrived at the boat on a Sunday night, after dark, after travelling from West Africa to the Caribbean, and found it was better than expected. He never pulled punches and made me aware of shortfalls. I expected to spend my one month leave working on the boat, but actually spent less than one week, and was able to spend 3 weeks sailing – wonderful bonus.

Thank you Andrew for putting up with all my questions, all my worries and all my crazy out of the time zone concerns – you were totally professional, but also I know that if and when we meet up, it will be like a friend finally meeting. You are always welcome on Aseka.


— Beverly Cory

Outstanding company with professional subject matter experts. If I were to buy or sell cruising sailboat, particularly a catamaran, Andrew would be my go to broker.

— JT

I have been sailing since I was a child and attended Massachusetts Maritime Academy. But when my wife and I began the process of purchasing an ocean cruising/racing catamaran, I realized that this is a world unto itself. Obviously, we needed to find someone knowledgeable to help us make an informed decision. More importantly, we needed someone honest and willing to put our interests before his or her own. I was lucky to work with Phil Berman at The Multihull Company. He repeatedly shunned the fast buck, choosing instead to work the long road to connect us with the “perfect boat”. I would be glad to recommend Phil and his company to anyone planning to purchase or sell a performance sailing machine.

— Eric Boutiette

Andrew Hodgdon was our broker when we bought our 2018 Lagoon 450F in Antigua in April 2922. He provided great service and was very attentive to our needs. We would highly recommend Andrew and the Multihull Company.

— Jim

See All Testimonials

Trust & ExpertiseAbout Us

Successful relationships cannot exist without it. At The Multihull Company we base every relationship on a firm commitment to earning and retaining our client’s trust.

Advice of any kind is valuable only when grounded in hard-won expertise. It too, must be trustworthy. Trust and expertise define the heart and soul of The Multihull Company. We are a team of skilled professionals who thrive on providing expert, trustworthy advice and service to catamaran and trimaran sailors around the globe.

Read More

Follow us @themultihullcompany