R31 Sterndrive

The perfect way to enjoy a weekend.

Design Yours
COBALT R31

An ideal choice for family boating, the R31 is a ‘just-right’ sized day boat that also offers style, ample interior room and a full complement of luxury features.

ACTIVITIES
  • Day Cruising
  • Wakeboarding
  • Skiing
  • At Anchor In-Water Activity
Environment
  • Large Bodies of Water
Trailering
  • No
LOA
31' 5"
Beam
9' 10"
Fuel
160 gal
Capacity
yacht certified
Head
yes

Exterior

Designed to be the ideal size for a family weekend getaway, Cobalt’s Model R31 sterndrive delivers smooth handling, impressive performance, luxury amenities and the comfort of Cobalt’s legendary ride.
Arch with Hard Top

This premium top features a fixed tinted glass portal, auto-actuated anchor light, LED RGB interior accent lighting, and accommodates an optional electric awning, and the optional Sandbar speaker system.

Hydraulic Swim Platform

Great for water activities, the full-width swim platform lowers below the water hydraulically with the push of a button, offering easy access in or out of the water and into the boat. And when paired with the patented flip-down swim step provides two levels below the waterline.

Side Entry Step

Experience easy dock-side boarding with a structurally reinforced starboard side entry step. The stainless steel and rubber tread offers a positive no-slip feel around wet environments.

Features & Innovations

Garmin Touchscreen
Interior Feature

Cobalt + Garmin

Harness the dependability, durability, and capability of Garmin at your helm with our feature rich, high-resolution glass cockpit. Here you'll find advanced navigation, networking and instrumentation technology combine with an intuitive interface to meet the needs of any captain. Get wider viewing angles and superior clarity on the touchscreen with full HD in-plane switching. Experience unparalleled coverage and detail with built-in Garmin Navionics+™ integrated coastal and inland mapping. With SmartMode™ everything is designed to give you quick, one-touch access to the information you need.

Saltwater or fresh — no matter where you take to the water, you can trust Garmin marine technology to give you an unsurpassed level of confidence at the helm.
Interior Innovation

Harman Kardon Audio System

Cobalt has partnered with Harman Kardon to bring their signature sound to the water. Guests can comfortably sit next to any speaker on the boat, guaranteeing a pleasant experience from every seat.. Includes marine ruggedized components and speakers that are classic yet timeless and can handle the harshest conditions–creating a top-tier audio system like none other in the marine industry.
Helm Watch
Interior Innovation

Helm Watch

The new Helm Watch feature is a secondary command center that gives your guests direct access to charts and cabin controls, enabling them to see where you’re going and adjust the sound track to make the journey more interesting.
Interior Innovation

Fresco Chil Vinyl

Finally, no more hot seats on darker colored vinyl while you’re out enjoying a full day of fun on the water. This anti-bacterial, anti-fungal, mildew-resistant, and sulfide stain-resistant fabric technology keeps your vinyl a full 15-20 degrees cooler than traditional vinyl even when it’s out in the sun.
Step & Platform Innovation

Hydraulic Swim Platform with Swim Step

Combine the convenience of a hydraulically submersible swim platform with the innovation of the patented Cobalt Swim Step and you'll have a multi-level home-base for all your water-borne activities. Easy access in or out of the water with two levels deployed below the waterline.

Performance Feature

Seakeeper

Introducing Seakeeper for Cobalt, the industry’s best-in-class gyroscope eliminating 95% of boat roll. Internally, a flywheel spins at speeds of up to 9,750 revolutions per minute, producing a powerful gyroscopic torque that counteracts boat roll. After initial start-up, the flywheel will reach full operational speed within 15 minutes. Then your Seakeeper can be engaged and disengaged instantly. Gone are the days of seasick guests and spilled drinks. It’s a luxury you never knew you needed but will soon learn you can’t live without.
Exterior Innovation

Splash & Stow

Cobalt’s award-winning Splash & Stow™ eliminates the traditional way of transporting, deploying, and retrieving heavy-duty, yacht-style inflatables. At the quick touch of a button, the inflatable is deployed and connected to the built-in power inflator, leading to hours of fun and enjoyment on the water. Available with either the Splash & Stow™ Inflatable Round Island or Inflatable Long Rectangle Mat.

Interior

The R31’s sleek lines and contemporary design reveal a deep cockpit and greater freeboard for a more spacious interior and larger bow and cockpit areas.
Prep Galley

This convenient small size galley is ideal for preparing an afternoon snack.  It features a pull-out walnut charcuterie board, tilting storage compartment, and refrigerator drawer as options.

Wide Helm Seat

Extra room at the helm includes this extra wide seat with an adjustable bolster.  Now the Captain has plenty of space for close company.

Programable LED Lighting

LED accent lighting just received an upgrade. This RGB system is full addressable via the Garmin touch-screen controls and can be programed in a wide range of colors and moving patterns.

Technical Details

  • Length Overall w/Swim Platform
    31' 5'' / 9.58 m
  • Beam
    9' 10'' / 2.99 m
  • Deadrise at Transom
    21 degrees / 21 degrees
  • Fuel Capacity
    160 gal / 606 L
  • Freshwater Capacity
    18 gal / 68 L
  • Bridge Clearance (windshield only)
    5' 4'' / 1.63 m
  • Bridge Clearance w/ Hardtop
    9' 1'' / 2.77 m
  • Bridge Clearance w/ Hardtop low position
    7' 8'' / 2.41 m
  • Draft Drive Up, Twin Eng.
    26'' / .66 m
  • Draft Drive Down, Twin Eng.
    44'' / 1.12 m
  • Dry Weight, w/Twin Engines (options not included)
    9500 lbs / 4309 kg
  • Boat Certified Capacity
    Yacht Certified
  • Boat Certified Capacity w/gear
    Yacht Certified

Volvo Penta

  • Twin V8-300CE-G DP Joystick - 300 hp (221 PkW)
  • Twin V8-350CE-G DP Joystick - 350 hp (261 Pkw)
  • Twin V8-380CE DP Joystick - 380 hp (283 PkW)
  • Twin V8-430CE DP Joystick - 430 hp (321 PkW)

MerCruiser

  • Twin 6.2 L MPI ECT-300 B3 DTS Axius - 300 hp (221 PkW)
  • Twin 6.2 L MPI ECT-350 B3 DTS Axius - 350 hp (261 PkW)
  • Twin 8.2 Mag ECT B3X DTS Axius - 380 hp (283 PkW)
  • Twin 8.2 Mag HO ECT B3X DTS Axius - 430 hp (321 PkW)

Engine Enhancements (Standard)

  • DTS (Merc)
  • EVC w/PTA & Cruise (Volvo)
  • Trip Computer (Volvo EVC)

Engine Enhancements (Optional)

  • Anti-Corrosion System (Vol 300hp)
  • Seacore (Merc)
  • TCC (Titanium Ceramic Coating)-Volvo
  • VOL Total Control Pkg (Autopilot & DPS)

Standard

  • Compass, Digital
  • Composite Helm Eyebrow, Custom Stitching
  • Depth & Water Temp Gauge Pkg.
  • Glass Cockpit, Dual Garmin 9" Displays
  • Hour Meters, Digital
  • Stainless Steel Switches
  • Steering Wheel, Black Leather/Stainless Steel
  • USB/USB-C Receptacle Charger
  • Digital Switching

Optional

  • Anti-Corrosion System (Vol 300hp)
  • Seacore (Merc)
  • TCC (Titanium Ceramic Coating)-Volvo
  • VOL Total Control Pkg (Autopilot & DPS)

Standard

  • iPod/USB/MP3 Port - Detail
    Includes USB-A and USB-C connections.  Multiple power ports throughout, and one power/data port at helm.

    iPod/USB/MP3 Port

    Includes USB-A and USB-C connections. Multiple power ports throughout, and one power/data port at helm.

  • Sound System w 6 Spkrs.
  • Stereo Remote, Dash - Detail
    Stereo Remote, Dash

    Stereo Remote, Dash

    Control all stereo functions from the convenient dash mounted head unit.

  • Stereo Remote, Transom (Prem/Plat Sound)

Optional

  • HK Plat Sound w/Transom Spkrs. - Detail
    HK Plat Sound w/Transom Spkrs.

    HK Plat Sound w/Transom Spkrs.

    The premium sound system is an all-new, first-of-its-kind marine audio system from Harman Kardon. The system was acoustically tuned to the R33 ensuring a brilliant, expertly tailored sound. Even the most discerning audiophiles will discover a sound that will make every journey more extraordinary.

  • HK Plat Sound w/Transom Spkrs.-Hard Top - Detail
    HK Plat Sound w/Transom Spkrs.-Hard Top

    HK Plat Sound w/Transom Spkrs.-Hard Top

    The premium sound system is an all-new, first-of-its-kind marine audio system from Harman Kardon. The system was acoustically tuned to the R33 ensuring a brilliant, expertly tailored sound. Even the most discerning audiophiles will discover a sound that will make every journey more extraordinary.

  • HK Sound w/Transom & Arch Spkrs-2 pr. (Sunshade) - Detail
    HK Sound w/Transom & Arch Spkrs-2 pr. (Sunshade)

    HK Sound w/Transom & Arch Spkrs-2 pr. (Sunshade)

    The premium sound system is an all-new, first-of-its-kind marine audio system from Harman Kardon. The system was acoustically tuned to the R33 ensuring a brilliant, expertly tailored sound. Even the most discerning audiophiles will discover a sound that will make every journey more extraordinary.

  • Prem Sound w/Transom & Arch Spkrs-1 pr.
  • Prem Sound w/Transom Spkrs.
  • Premium Sound w/Transom Spkrs.-Hard Top
  • Satellite Radio System
  • Stereo Remote, Transom (Std. Sound)
  • HK Sound w/Transom & Sandbar Arch Spkrs (Hardtop)

Standard

  • Bench Seat Storage
  • Bow Walk-Thru Door
  • Cooler, 36 qt. (cockpit seat only)
  • Dual Sundeck Convertible Lounger
  • Head w/Pump Out Porta Potti - Detail
    Head w/Pump Out Porta Potti

    Head w/Pump Out Porta Potti

    Easily accessible, upholstered head compartment. Shown with fixed Porta Potti.

  • Helm Seat, Extra Wide
  • Ice Chest, Bow
  • Seating Varadense Comfort
  • Sink Console (head compartment) - Detail
    Sink Console (head compartment)

    Sink Console (head compartment)

    Easily accessible, upholstered head compartment. Shown with porcelain toilet and sink console.

  • Trash Receptacle

Optional

  • Air Compressor w/Holder - Detail
    Air Compressor w/Holder

    Air Compressor w/Holder

    12v power inflator for water toys, with a dedicated holder.

  • Air Conditioning (Head/Helm)
  • Bow Center Cushion Insert
  • Bow Table (additional) - Detail
    Bow Table (additional)

    Bow Table (additional)

  • Cockpit Heater
  • Cooler, Soft-Side 37L
  • Dinette Table w/Bow & Cockpit Receptacle - Detail
    Dinette Table w/Bow & Cockpit Receptacle

    Dinette Table w/Bow & Cockpit Receptacle

  • Dinette Table, Solid Teak
  • Floor Covering, Sea Grass (bow, cockpit)
  • Floor Covering, Sea Grass (head)
  • Floor Covering, Sea Grass (helm footrest)
  • Snack Stand w/Refrigerator - Detail
    Galley, Cockpit (replaces seat)

    Snack Stand w/Refrigerator

    Galley with freshwater sink, refrigerator and optional electric grill.

  • Gray Water System
  • Head, Vac (Thetford) w/Macerator - Detail
    Head, Vac (Thetford) w/Macerator

    Head, Vac (Thetford) w/Macerator

  • Head, Vac (Thetford) - Detail
    Head, Vac (Thetford)

    Head, Vac (Thetford)

  • Helm Seat, Electric
  • Interior Trim Pkg., Wood
  • LED Interior Accent Lighting (RGB) w/Hardtop - Detail
    LED Interior Accent Lighting (RGB) w/Hardtop

    LED Interior Accent Lighting (RGB) w/Hardtop

    (Shown in Cobalt model R6)

  • Sof-Trac Mat (bow, cockpit)
  • Sof-Trac Mat (head)
  • Sof-Trac Mat (helm footrest)
  • Stainless Steel Foot Tread (helm only)
  • Teak Floor, Bow & Cockpit - Detail
    Teak Floor, Bow & Cockpit

    Teak Floor, Bow & Cockpit

  • Teak Floor, Head
  • Throw Pillows, Weighted (10) - Detail
    Throw Pillows, Weighted (10)

    Throw Pillows, Weighted (10)

    Pillows are filled with 4 pounds of Vyram weighted pellets for stable placement while boat is underway. Available in five Sunbrella outdoor fabric colors. Size: 22 x 22 inches.

  • Throw Pillows, Weighted (4) - Detail
    Throw Pillows, Weighted (4)

    Throw Pillows, Weighted (4)

    Pillows are filled with 4 pounds of Vyram weighted pellets for stable placement while boat is underway. Available in five Sunbrella outdoor fabric colors. Size: 22 x 22 inches.

  • Wireless Phone Chargers, w/Holder
  • Closet-Watersports (Head Compartment)
  • Convenience Package
  • Helm Watch, Passenger
  • LED Interior Accent Lighting (RGB) w/o Hardtop
  • Phone Chargers, Bow (2)
  • Sof-Trac Mat (watersports closet)
  • Teak, Fold-Down Footrest

Standard

  • Anchor Locker
  • Bow Scuff Plate, Stainless Steel - Detail
    Bow Scuff Plate, Stainless Steel

    Bow Scuff Plate, Stainless Steel

    Protect the gelcoat from trailer hook damage with the unparalleled bow scuff plate. Both fashionable and functional, the bow scuff plate from Cobalt is through bolted and designed custom for every Cobalt. Style may vary slightly depending on model.

  • Cleats (Bow, Midship, Stern)
  • COBALT Lettering, Chrome Backlit
  • Extended Running Surface
  • Graphics, Molded-In Gelcoat
  • Motorbox Actuator
  • Ski Tow - Stainless Steel
  • Stainless Steel Engine Vents
  • Swim Platform w/Flip-Down Swim Step
  • Transhield Shipping Cover
  • Windshield, Black Frame
  • Cockpit Entry Step

Optional

  • Board Rack Covers, PTM
  • Wakeboard Racks, PTM ClampForce 3.0
  • Arch w/Hard Top
  • Arch w/Hard Top/Electric Awning
  • Board Rack Covers, Roswell
  • COBALT Lettering, Satin Black (exterior) - Detail
    COBALT Lettering, Satin Black (exterior)

    COBALT Lettering, Satin Black (exterior)

  • COBALT Lettering, Satin White (exterior)
  • Fender Clips w/Line (6) w/Storage - Detail
    Fender Clips w/Line (6)

    Fender Clips w/Line (6) w/Storage

    A set of Custom Stainless Fender Clips, which provide a solid and secure place to hang the fenders. Includes the insert, the receptacle, and fender lines.

  • Flagpole w/Flag - Detail
    Flagpole w/Flag

    Flagpole w/Flag

    Stainless steel flag pole with flag clips, receptacle and flag.

  • Sof-Trac Mat, Swim Platform
  • Splash & Stow¬¨√Ü, Inflatable Island - Detail
    Splash & Stow®, Inflatable Island

    Splash & Stow®, Inflatable Island

  • Splash & Stow¬¨√Ü, Inflatable Mat - Detail
    Splash & Stow®, Inflatable Mat

    Splash & Stow®, Inflatable Mat

  • Swim Platform Hydraulic w/Flip-Down Step - Detail
    Swim Platform Hydraulic w/Flip-Down Step

    Swim Platform Hydraulic w/Flip-Down Step

  • Swim Platform Transom Lighting - Detail
    Swim Platform Transom Lighting

    Swim Platform Transom Lighting

    LED transom lighting provides the appropriate level of illumination for the perfect evening of entertaining friends. Shown on model 242 with standard swim platform.

  • Teak Swim Platform - Detail
    Teak Swim Platform

    Teak Swim Platform

    Shown on optional hydraulic swim platform.

  • Transom Shower (cold water)
  • Transom Tilt Switches (twin)
  • Underwater Lighting - Detail
    Underwater Lighting

    Underwater Lighting

    LED underwater lighting system includes two light pods and the switch module. Beautiful evenings begin with illumination. Shown on model R8 Surf.

  • Wakeboard Racks, T2 (Roswell) w/clamps
  • Camera, Rear Facing (req. Hardtop)
  • Footrest, Helm (Fold-Down)
  • Windows, Hull Side

Optional

  • Mooring Cover - Detail
    Mooring Cover

    Mooring Cover

    The ultimate in weather protection, our mooring cover is custom built for each Cobalt model. The custom cover includes velcro closures around the tops, and stainless steel winches on the gunwale straps, and tent poles to prevent water pooling.

  • Bow Tonneau Cover - Detail
    Bow Tonneau Cover

    Bow Tonneau Cover

    Sunbrella Canvas bow cover with stainless steel snaps and velcro which attaches to cockpit cover.

  • Shade Sail, Aft (req. Hard Top)
  • Cockpit Tonneau Cover - Detail
    Cockpit Tonneau Cover

    Cockpit Tonneau Cover

    Sunbrella Cockpit Cover with stainless steel snaps custom designed for each Cobalt (including those boats with an arch or Bimini top). Shown on model 200.

  • Shade Sail, Bow - Detail
    Shade Sail, Bow

    Shade Sail, Bow

    Shade Sail shown on R8 Surf.

Standard

  • 10/5/3 Year Warranty Protection
  • Battery Switch, Dual w/ACR - Detail
    Battery Switch, Dual w/ACR

    Battery Switch, Dual w/ACR

    Dual battery and voltage sensitive relay provides instant accessibility emergency power. Installation varies with specific boat model.

  • Circuit Breaker Protected Elec System - Detail
    Circuit Breaker Protected Elec System

    Circuit Breaker Protected Elec System

    Stainless steel circuit breakers can be reset with the touch of a button, and provide surge protection for the electrical system. Installation will vary depending on specific boat model.

  • Composite Floor
  • Composite Seat Bases
  • Composite Transom
  • Fiberglass Cockpit Liner
  • Fiberglass Stringer System
  • Fire Extinguisher(s), Manual
  • Ignition Safety Switch - Detail
    Ignition Safety Switch

    Ignition Safety Switch

    Standard engine ignition safety switch with belt clip.

  • Kevlar Reinforced Hull
  • Stainless Steel Windshield Braces - Detail
    Stainless Steel Windshield Braces

    Stainless Steel Windshield Braces

    Solid stainless steel windshield support stanchions. Installation will vary depending on specific boat model.

  • Through Prop Exhaust

Optional

  • CE Requirements w/Auto Fire Extinguisher - Detail
    CE Requirements w/Auto Fire Extinguisher

    CE Requirements w/Auto Fire Extinguisher

  • Battery Maintainer/Charger, 110v
  • Battery Maintainer/Charger, 220v - Detail
    Battery Maintainer/Charger, 220v

    Battery Maintainer/Charger, 220v

    Built in battery charger located in the engine compartment with external power connection at the transom.

  • Fire Extinguisher, Automatic System - Detail
    Fire Extinguisher, Automatic System

    Fire Extinguisher, Automatic System

    Heat sensitive automatic Fireboy system mounted in the engine compartment designed to instantly eliminate flames in the event of an engine fire. Installation will vary depending on specific boat model.

  • Gyroscope, Seakeeper 1 - Detail
    Gyroscope, Seakeeper 1

    Gyroscope, Seakeeper 1

  • Tool Kit - Detail
    Tool Kit

    Tool Kit

  • Trim Tabs w/Indicators w/Autoglide - Detail
    Trim Tabs w/Indicators w/Autoglide

    Trim Tabs w/Indicators w/Autoglide

    Fine tune your ride with trim tabs. Great for load leveling or extreme low speed cruising.

  • Trim Tabs w/Indicators, w/o Autoglide - Detail
    Trim Tabs w/Indicators, w/o Autoglide

    Trim Tabs w/Indicators, w/o Autoglide

    Fine tune your ride with trim tabs. Great for load leveling or extreme low speed cruising.

  • Windlass w/Docking Lights System
  • Rearview Mirror, Roswell w/Custom Cover

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