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2010 Custom Malcolm Tennant Power Cat

Georgetown, South Carolina


Rhumba is a 2010 65' Cat Man Cats built, Malcolm Tenant designed power catamaran.  Her very experienced owner continues to upgrade, update and maintain her in his own marina.  She offers twin Cummins main engines, twin Northern Lights generators (2019), four Outback 2500 watt inverters, Dual Gulf Coast fuel polishing systems, Espar Hydronic heating system, dual Maxwell 3500 anchor windlasses, massive, covered aftdeck, huge salon settee, internal stairs to the flybridge and dual master staterooms. 


Northstar Yacht Sales, LLC is pleased to assist you in the purchase of this vessel. This boat is centrally listed by TMC.

Basic Boat Info

Tax Status: Paid
Boat Name: Rhumba
Make: Custom
Model: Malcolm Tennant Power Cat
Year: 2010
Condition: Used
Category: Power
Construction: Fiberglass
Boat Hull ID: UCCGRT1LJ808
Has Hull ID: Yes


Length: 65 ft / 19.81 m
Length Overall: 65 ft / 19.81 m
Beam: 25 ft / 7.62 m
Max Draft: 4'6 ft / 1.37 m
Displacement: 65,000 lb
Single Berths: 4
Double Berths: 2
Cabins Count: 4

Engines / Speed

Cruising Speed: 11 kn
Maximum Speed: 23 kn


Heads Count: 4
Boat Class: Power Catamarans


Cummins QSM11M 670 hp 400+/- hrs (new ECMs 9/1/18 increase HP from 580 to 670)

Transmission: ZF 325 V-Drive; Ratio 2.037

Shafts: Evolution Drive with Thrust Bearings

Props: Hale Props 5 blade 30x32


Fuel: 2500 gal total

  • Main Tanks 2x 1180 gal
  • Day Tanks  2x 70 gal

Fresh Water: 472 gal total, 236/side

Gray Water: 590 gal total, 295/side

Black Water: 448 gal total, 224/side


Master Suites: 2 – 1 forward each hull – Queen with en suite heads

Guest Rooms: 2 – 1 aft each hull - Bunks

Heads (4 Total):

  1. 1 per Master Suite (2)
  2. 1 Guest Room
  3. 1 Day Room

Master Staterooms

Identical master staterooms forward on each side

  • Queen size berth
  • Nightstands
  • Reading lights
  • Fans
  • Storage cabinets and drawers
  • Shelf
  • 2 Portlights with shades
  • Carpet
  • Ensuite head with enclosed shower

Guest Staterooms

Aft guest stateroom on each side

  • Port guest head is a wethead
  • Starboard guest head includes an enclosed shower.
  • Over/Under Bunks
  • Fan
  • Reading lights
  • Hanging locker
  • Shelf
  • 2 portlights with shades
  • Carpeted
  • Large wrap-around settee
  • 2x Hi/Lo tables forward
  • Storage cabinets
  • Drawers and hanging locker starboard aft
  • Entertainment center with a flat screen TV on a lift to starboard
  • Storage outboard on each side of the settee
  • 2x bar stools at the galley countertop
  • Opening forward and side windows
  • Bound carpet runners on a wood sole.



Galley is located port aft of the salon.

Dining space is available at the salon settee, flybridge settee and the aftdeck settee.

  • 4 X Vitrifrigo under-counter refrigerator/freezers
  • Force 10 stainless steel 3-burner propane cooktop and oven
  • Sharp Carousel microwave oven
  • Kitchenaid trash compactor
  • Fisher & Paykel Dish Drawer dish washer
  • Filtered fresh water faucet
  • Elkay stainless steel sink
  • Solid surface countertop
  • Storage drawers and cabinets
  • Opening window to the aftdeck
  • Force 10 stainless steel BBQ grill on the aftdeck
  • 2 X Frigoboat freezers in the aftdeck cabinetry
  • Enclosed Flybridge
  • Helm forward with storage underneath
  • Helmseat
  • Opening windshield windows
  • Side windows with screens and blinds
  • Desk port forward
  • Entertainment center to port with a Saumsung flat screen TV on a lift
  • Samsung Ultra HD BluRay player

  • Fusion MS-RA70 stereo in the salon

  • Fusion interior and exterior speakers

  • Storage cabinet port aft
  • Sundeck access door aft
  • Internal stairs to the salon starboard aft
  • Wrap-around settee/storage with table to starboard and carpet.

Covered Aftdeck

  • Benchseats with storage on each side aft
  • Eisenglass side curtains
  • 4 deck chairs
  • Wrap-around settee with table starboard forward
  • Wet bar with storage
  • Splendide 2100xc washer/dryer
  • Propane locker
  • Force 10 stainless steel BBQ grill
  • 2x cold-plate freezers forward,
  • Opening window to the galley
  • Non-skid deck
  • 3x Centerline under-deck storage lockers
  • Molded-in steps to each side deck


  • Non-skid deck
  • Rod holders
  • Transom gate
  • Hot/Cold fresh water shower
  • Washdown
  • Steps to the aftdeck.

Navigation: Furuno TZT2BB (installed July 2021) with MaxSea Time Zero chart-plot

Displays: 3-Dell

AIS: Furuno FA-150

Radar: Furuno 6’ open array

Radios: VHF 2 Fixed Mount – ICOM IC-M604SSB ICOM 803

Autopilot: 2x ComNav2000 (factory svc 10/1/18)

Depth Sounders

  •      2x Airmar IDT800-N2K (1ea Hull)
  •      Airmar B60-20 (hard wire to Furuno)
  •      Maretron DST110 (Depth, Speed, Temp)


  • Backbone- Helm through both hulls
  • Tankage: 8x TLM100 (2 each Fuel, H2O,Gray H2O, Black H20)
  • SSCompass Maretron SSC300
  • NK2-N183 Gateway Maretron USB100
  • GPS Maretron GPS100
  • 3-Maretron Displays

Satellite TV: KVH M7 with Dish Network; replacing with KVH: UHD-7 (on Backorder)

Satellite Phone: Inmarsat IsatPhone Pro

Electrical Systems


  • 800AH@24V Mastervolt AGM Bank (install 2020)
  • 8 x 6V 400Ah Mastervolt with 4S2P connections. 4 each in Series (400AH@24v) paralleled x 2 giving 800Ah@24V


  • 2x – Northern Lights 6kW M673L3G (new 3/15/19)
  • 1 – 160amp Electrodyne 24v Alternator (spare on board)


  1. 4x stacked OutBack 2500 watt; 110v & 220v (factory svc 9/1/18)


  • Outback battery charger
  • Charles Industries 12 kva isotransformer
  • 2 x Iota Engineering DLS-27-40 power converters
  • 8 x solar panels
  • Bogart Engineering TM-2025 Battery System Monitor
  • 50 amp shore power cord
  • Glendinning Cablemaster shore power cord system
  • Shore power connection each side amidships
  • BlueSea battery switches
  • 2 x Victron Orion battery chargers
  • 2 x Victron Skylla-1 24 vdc 100 amp battery chargers
  • 2 x 12 vdc outlets in the flybridge
  • Delco-Remy 130 amp alternator
Engine/Mechanical Equipment
  • Twin Cummins QSM11 590 HO 670 HP main engines (New ECM's installed in 2018 to increase HP to 670)
  • ZF 325 IV gearboxes
  • ZF electronic engine controls
  • Mercury Cummins engine system panels
  • Groco sea strainers
  • Hynautic hydraulic steering system
  • DeAngelo exhaust systems
  • Racor 1000MA fuel filter with vacuum gauge for each main engine
  • 2 x Gulf Coast fuel polishing systems
  • Reverso oil change system
  • Waterwitch Systems monitor panel
  • Dometic reverse cycle air conditioning system with SMXir controls (Eight zones)
  • Espar Hydronic 16-35 heating system
  • Spectra Newport 400 MKII watermaker
  • Electric heads
Deck Equipment
  • 2 x Maxwell 3500 anchor windlasses with wired remote control
  • Rocna 242 lb anchor with 400' anchor chain
  • Rocna 73 lb anchor with 300' anchor chain
  • Anchor bridle - Aluminum rails
  • Washdown fore and aft
  • Stainless steel deck hardware
  • Boarding gate each side
  • Non-skid decks
  • 10 x rod holders
  • 2 x stainless steel swim ladders
Safety Equipment and Fire Protection
  • Nautica 15' RIB
  • Evinrude 30 HP outboard
  • Steelhead SM1000R davit
  • Yamaha 2.5 HP 4-stroke outboard

Dometic (Installed October 2013):

  • 4x Turbo STX16C self-contained units (2 svc salon, 2 svc pilot house)
  • 4x Turbo STX6C units (1 in each cabin)

Diesel Heater: Espar Hydronic 16-35

  • Sure Marine heater fans all Cabins, Pilot House & Salon
Miscellaneous Equipment

Crane Steelhead Marine SM1000R

Watermaker Spectra Newport400MKII


  • 2x Vitifrigio SS Drawer units 24v galley
  • 2x Frigoboat chest refrigerator/freezer aft deck

Swim Ladders 2x (1 each Cockpit)

Ground Tackle

  • 2x Rocna- 1-110kg with 400’ chain & 1-70kg with 300’
  • 2x Maxwell 3500 Windless
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.

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