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.
- Day Cruising
- Wakeboarding
- Skiing
- At Anchor In-Water Activity
- Large Bodies of Water
- No
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.
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.
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.
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
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.
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
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.
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.
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.
Seakeeper
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.
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.
Extra room at the helm includes this extra wide seat with an adjustable bolster. Now the Captain has plenty of space for close company.
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 Platform31' 5'' / 9.58 m
- Beam9' 10'' / 2.99 m
- Deadrise at Transom21 degrees / 21 degrees
- Fuel Capacity160 gal / 606 L
- Freshwater Capacity18 gal / 68 L
- Bridge Clearance (windshield only)5' 4'' / 1.63 m
- Bridge Clearance w/ Hardtop9' 1'' / 2.77 m
- Bridge Clearance w/ Hardtop low position7' 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 CapacityYacht Certified
- Boat Certified Capacity w/gearYacht 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
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
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.
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
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)
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
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)
Easily accessible, upholstered head compartment. Shown with porcelain toilet and sink console.
- Trash Receptacle
Optional
- Air Compressor w/Holder - Detail
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)
- Cockpit Heater
- Cooler, Soft-Side 37L
- Dinette Table w/Bow & Cockpit Receptacle - Detail
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
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) - Detail
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
(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, Head
- Throw Pillows, Weighted (10) - Detail
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)
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
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 White (exterior)
- Fender Clips w/Line (6) w/Storage - Detail
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
Stainless steel flag pole with flag clips, receptacle and flag.
- Sof-Trac Mat, Swim Platform
- Splash & Stow®, Inflatable Island - Detail
Splash & Stow®, Inflatable Island
- Splash & Stow®, Inflatable Mat - Detail
Splash & Stow®, Inflatable Mat
- Swim Platform Hydraulic w/Flip-Down Step - Detail
Swim Platform Hydraulic w/Flip-Down Step
- Swim Platform Transom Lighting - Detail
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
Shown on optional hydraulic swim platform.
- Transom Shower (cold water)
- Transom Tilt Switches (twin)
- Underwater Lighting - Detail
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
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
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
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 shown on R8 Surf.
Standard
- 10/5/3 Year Warranty Protection
- Battery Switch, Dual w/ACR - Detail
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
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
Standard engine ignition safety switch with belt clip.
- Kevlar Reinforced Hull
- Stainless Steel Windshield Braces - Detail
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
- Battery Maintainer/Charger, 110v
- Battery Maintainer/Charger, 220v - Detail
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
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
- Tool Kit - Detail
Tool Kit
- Trim Tabs w/Indicators w/Autoglide - Detail
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
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