8.5m Wide-Beam Amphibious Fishing Boat NZ | Flyfin 850HTA
Built for owners and operators who need the most room and stability in the Amphibious range, the Flyfin 850HTA is a wide-beam amphibious boat, 8.55m overall, designed and built by Flyfin Boats in Papamoa Beach, New Zealand. Its 2.8m beam gives a noticeably steadier platform at rest and in following seas, and the Tectrax T4000 Gen2 wheel system is built in, not bolted on as an afterthought, so Flyfin’s largest amphibious boat still launches straight off the beach. Rated for 300 to 450 hp with a 300L fuel tank, this 8.5m amphibious boat is the only model in the range with an optional upgrade to the heavier-duty Tectrax T5000. See the full 850HTA specifications →
- Tectrax T4000 Gen 2
- Mercury 300 hp XL
- Custom-Built Trailer
Flyfin 850HTA Package
From $502,047 NZD
The standard package includes the 8.55m wide-beam amphibious hull with the Tectrax T4000 Gen2 wheel system, a Mercury 300 hp XL outboard and a custom-built Flyfin Aluminium Trailer, matched and ready to launch when it leaves Papamoa Beach. The final price depends on your layout and chosen options.
Why the 850HTA?
Stability and Performance
A 2.8m beam delivers genuine stability at rest, through chop and under power, and the hull is rated for 300 to 450 hp.
Space and Capability
With the widest beam in the range and a 750kg payload, the 850HTA gives charter operators, dive teams and serious private owners the deck space to work without getting in each other's way.
Amphibious Upgrade
Standard with the Tectrax T4000 Gen2, the 850HTA is the only Amphibious model with an optional upgrade to the heavier-duty Tectrax T5000, with optional dual front wheels.
Serious Fishing
Two underfloor wet lockers, four internal shelves and a carpeted forward cabin, finished with upholstered hardtop panels and panoramic glass, so serious fishing and family comfort sit side by side.
All Specifications
*Specifications may vary based on chosen equipment.
Performance may vary due to equipment, weather and load conditions.
What Comes Standard on the 850HTA
Every 850HTA ships fully equipped as standard. See the full feature list, the Tectrax wheel system and the specifications below. Beyond that baseline, the configuration can be adjusted to suit how you'll use the boat and your onboard preferences. The 850HTA carries the Tectrax T4000 Gen2 as standard, rated to a 4000kg gross vessel mass, and it's the only model in the range with an optional upgrade to the heavier-duty Tectrax T5000.
01Engine
- Recommended power: 300 to 450 hp
02Trailer
- 6mm 5083 extra heavy-duty welded frame, tandem axle
- Tandem axle with 1500kg axle rating and leaf springs
- Trojan axles and hub assembly
- Double return fold on the main beams for stiffness and excellent road holding
- Extra-low design for easy launching
- Open channel design for easy cleaning
- 13" black alloy wheels with large-profile 195R13C tyres
- Flyfin easy-load slipper bunks with nylon strip
- Solid welded snubber block to secure the boat tightly
- Trojan duo hitch, 1 7/8" and 50mm
- Trojan 10:1 winch
- Extra heavy-duty solid jockey wheel, 350kg
- Built-in structural walk board
- Flyfin design curved mudguards
- Side steps on the mudguards
- Narva LED submersible lights
- Aft tail light protection
- Optional multi-roller setup
- Optional stone guard
03Steering, trim & anchoring
- Zipwake Pro trim tab system
- SeaStar hydraulic steering
- Savwinch drum winch anchoring system, with anchor and chain
- Tectrax bow wheel camera
04Power, wiring & charging
- Flyfin-engineered dual battery system, with start and house batteries and switching
- 12V wiring loom
- Push-button breakers for the 12V main house battery and 24-hour bilge feed
- 2 x 6-way backlit switch panels with Flyfin LED push buttons
- Dual battery compatible
- CTEK battery charger supplied, plugs into the Flyfin battery system to maintain the boat batteries
05Fuel, bilge & navigation
- Built-in fuel tank, 300L
- In-built fuel expansion tank
- 12V fuel level sender
- 1 x through-hull water pick-up
- Easy-access panel for servicing behind the helm
- 1200GPH automatic bilge pump, auto and manual
- Narva LED navigation lights, side plus anchor and steaming light
- Windscreen wiper on the centre window (other windows optional)
06Hull design & performance
- Amphibious-specific hull
- Delta and planing strakes for hull lift
- Long waterline length for better performance and fuel efficiency, with no motor pod extension
- Offshore performance deep-V hull
- Full buoyancy hull for large-weight engines
- Sealed buoyancy compartments
- Large bow and high sheer line
07Finish & deck hardware
- Fully painted in solid standard Flyfin colours
- Fully welded aluminium rub rail
- Bow rail, 38mm rail and 32mm stanchion
- Trim tab plates
08Fittings, cleats & mounts
- Flyfin proprietary-built stern cage and side boarding ladder
- Built-in bow fairlead and roller
- 3 x welded aluminium cleats
- Welded stern grab rails
- Large swim platform
- Pedestal seat bases with Flyfin sports seats
- Large transducer mounts, port and starboard
09Cockpit floor & layout
- Full-width raised cockpit floor
- Easy-drain cockpit floor with side scupper drains
- Welded foot rests
- Flat floor, U-Deck ready
- U-Deck safety pads in essential areas (if U-Deck is not optioned)
- Drop-down cabin floor
10Fishing & hardtop hardware
- 6 x fully welded rod holders
- 7 x fully welded rod holders on the back of the hardtop
- 2 x fully welded roof grab rails on top of the hardtop
- 2 x fully welded roof grab rails on the underside of the hardtop
- 2 x fully welded aft hardtop grab rails
11Hardtop, glazing & trim
- Large forward hardtop brow to reduce sun and glare
- Large panoramic glass with small mullions for a light, modern and unobstructed view
- Toughened glass with a light grey tint
- Fully glued structural glass for a strong, clean look
- Upholstered panels in the hardtop roof
12Helm & dash
- 10mm piano black acrylic dash
- Large dash top with fiddle rail
- Flyfin multi-spoke heavy-duty premium steering wheel
- Driver and passenger side pockets
13Cabin & storage
- Carpeted forward cabin
- 2 x carpeted shelves in the forward cabin
- 4 x in-built internal shelves
- 3 x cabin squabs, with optional centre infill
- Forward cabin hatch
- 2 x underfloor wet lockers, draining to the ballast compartment
- Raised battery compartment
- Black aft battery compartment hatches
14Boarding & comfort
- Stern walk-through with easy-use washboard flap
- Walk-through for easy boarding
- 8 drink holders
Tectrax Wheel System: Features
- Tectrax T4000 Gen2 amphibious drive system as standard
- Optional upgrade to the heavier-duty Tectrax T5000, with optional dual front wheels
- Fully electric, with no hydraulic oil system
- Digital integrated steering, drive by steering wheel or joystick
- Optional range-extending batteries
- Optional DC-DC charging off the outboard
- Optional solar charging for the wheel system
Tectrax Wheel System: Specifications (T4000 Gen2)
- Gross vessel mass (GCM), max
- 4000kg
- System weight
- 475kg
- Maximum speed over land
- 9km/h
- Total torque
- 4500Nm
- Maximum incline angle
- 15°
- Range (standard)
- 9km
- Operating temperature range
- 0°C to +45°C
- Battery capacity (standard)
- 7.2kWh
- Battery voltage
- 48V
- Battery cell technology
- Lithium iron phosphate (LiFePO4)
- Recharge time (standard charger, from empty)
- 5 hours
- Ingress protection
- IP67
- Warranty, wheel system
- 3 years
- Warranty, battery
- 10 years
- Length overall
- 8.55m
- Beam overall
- 2.8m
- Height on wheels*
- 3.25m
- Length on wheels, motor down*
- 9.45m
- Length on wheels, wheels up*
- 9.85m
- Recommended power
- 300 to 450 hp
- Fuel tank
- 300L
- Max payload*
- 750kg
- Dry hull weight
- 1500kg
- Weight on wheels (engine, wheels and boat, ready to run with delivery fuel)
- 3000 to 3600kg
- Deadrise
- 18°
- Hull thickness
- 6mm
- Transom and engine mount
- 6mm
- Structure, cockpit sole
- 4mm
- Topsides and cabin
- 4mm
- Hardtop
- 3mm
- Wheel mounts
- 12mm
* May vary depending on specification.
Configure Your Flyfin 850HTA
Every layout on a given model shares the same offshore-bred hull, dimensions and construction standard. You're choosing how the boat works for you, not trading away build quality to get the layout you want.
Key Features and Premium Accessories of Your 8.5m Amphibious Boat
Find Your Amphibious Flyfin
Four models, one system. The 700, 750, 820 and 850 HTA all share the same amphibious capability, but differ in size and capacity. Use the table below to compare specifications across the range and find the right size for how you’ll use it.
Compare all Specifications and Features Hide Specifications and Features
Specifications & features
01Dimensions
02Weight & payload
03Engine & fuel
04Hull construction
05Tectrax wheel system
06Standard hull features
07Topsides & cabin
08Onboard systems
Same Launch, Less Boat: the Flyfin 750HTA
7.5m Length · 2.55m Beam · 225 to 350 hp · 250L Fuel
Frequently Asked Questions
he Flyfin 850HTA is a wide-beam amphibious boat, 8.55m overall, designed and built by Flyfin Boats in Papamoa Beach, New Zealand. It's the flagship of the Flyfin Amphibious range, with a 2.8m beam, a rating of 300 to 450 hp and the Tectrax T4000 Gen2 wheel system built in.
The 2.8m beam makes the 850HTA noticeably more stable at rest and in following seas. It needs slightly more power to get on the plane than a narrower hull, and rewards you with a flat, steady and comfortable ride offshore.
Yes. At 8.55m overall with a 2.8m beam, the 850HTA is the largest and widest boat in the Flyfin Amphibious range, and the only one with the option of the heavier-duty Tectrax T5000.
The Tectrax T5000 is the heavier-duty wheel system above the T4000 Gen2, with a higher rated gross vessel mass and the option of dual front wheels. It's available as an option on the 850HTA only. Contact the Flyfin team for pricing and specifications.
The Tectrax T4000 Gen2 system deploys electrically driven wheels that let the boat drive itself down a suitable beach or shoreline and into the water, with no trailer or boat ramp needed. Once you're afloat, the wheels retract.
No. The Tectrax system is designed for launching and retrieving at the water's edge, not for road use. The boat travels on its Flyfin Aluminium Trailer, and the wheels take over at the beach.
The Tectrax T4000 Gen2 is rated for inclines of up to 15°, which covers most natural shorelines and boat ramps.
The 850HTA is 350mm longer and 250mm wider than the 820HTA, with a 2.8m beam against 2.55m, a 1500kg dry hull weight against 1200kg, and the option of the heavier-duty Tectrax T5000. The wider beam is the defining difference, giving more stability and deck space.
The Tectrax system is designed for minimal maintenance. Rinse it with fresh water after saltwater use and follow the Tectrax service schedule. The system is covered by a 3-year warranty, and the battery by a 10-year warranty.
The standard 850HTA package includes a Mercury 300 hp XL outboard, and the hull is rated for 300 to 450 hp.