Viper 4S Series II

Viper Hovercraft

Viper 4S Hovercraft is our elite four person design which is ideal for fishing, farming, industrial and recreational use.

The Viper 4S is a enhanced version of the Viper 4, with many inclusions that provide improved comfort and performance.

The Viper 4S, like all our hovercraft retains a beautiful finish, with well layout features that provide comfort and safety. It is simply a joy to fly without the need to for full power, or struggling in high winds or large chop.

The Viper 4S is manufactured using the best materials and engine. The hull is light just by design and incredibly strong, by taking advantage of high end fibreglass fabrics, resins and fabrication techniques.

The Viper 4S incorporates localized Kevlar reinforcement which provides weight reduction, whilst adding additional strength and durability.

The Viper 4S Hovercraft is a stable floating platform for fishing, diving and retrieving. Our positive buoyancy system ensures a unsinkable Hovercraft, even if it is completely swamped. Easy passage to all interior deck areas, gives this design the edge over all competitors.

The Viper 4S is powered by either a 65hp, inline two cylinder, air cooled aircraft engine or new for 2018, the latest "Spec 2" water cooled two-stroke aircraft engine setup.

The Viper 4S model has the larger Series 5 fan duct, flow vanes and elevator system which provides excellent performance at lower fan speeds. We have also included our own unique driveline dampening system, which increases engine and drive system life.

Viper 4S II Hovercraft

Viper 4S II Hovercraft

Viper 4S features

  • Capacity to seat four adults & gear in comfort
  • Enclosed electrical and engine air-intake filtration system
  • Externally vented and removable aluminium fuel tank
  • High gloss, marine grade gel coat finish
  • Tooth belt drive system with torsional dampener
  • Large storage capacity
  • High bouyancy capacity

Construction Detail

  • GRP Foam composite hull and components with localised Kevlar reinforcement
  • Carbon Fiber Dash
  • Carbon Fiber control vanes
  • Carbon Fiber elevator vanes
  • Carbon Fiber flow straighteners
  • Galvanised engine frame
  • Aluminium coated exhaust system with silencer
  • Colours - White, Central Blue, Safety yellow, Signal red, Chrome green and more.


  • Larger splash guard wind shield
  • Forward and rear deck cleats
  • Forward tow point
  • Gunwale to provide Impact protection 
  • Elevator trim system
  • Flow straighteners
  • Auto bilge pump (500gph)
  • Orange strobe light
  • Cockpit hand rails
  • Deck and floor anti-slip finish
  • Quality coated nylon skirting

Dash components

  • Tachometer
  • Hour meter
  • Fuel level gauge
  • Voltmeter
  • Temperature gauge
  • Choke control (on handle bar)
  • 12 Volt external outlet

Standard inclusions:

  • Operator manual and log book
  • 15 spare skirt segments
  • Spare ignition key


  • Oil injection
  • Fuel injection (Hirth only)
  • Forward compartments
  • Forward foot wells
  • Navigation lights

Viper 4S II Specifications

Seating  1 crew, 3 passengers, Inline
Length 4.25 m (14 ft)
Width 2.2 m (7.2 ft)
Height  1.5m (4.9 ft)
Weight (dry) 220kg (485 lb)
Payload 400kg (881 lb)
Hover height (avg) 240mm (0.78 ft)
Positive Buoyancy 780kg (1,720 lb)
Fuel capacity 30 L (8 gal)
Thrust (Approx) 85kg (187 lb)
Speed - smooth water 80kph (43 knot)
Speed - ice 100kph (53 knot)
Ideal Cruise speed 30 - 50kph (16 - 26 knot)
Endurance @ Cruise    3 - 3.2 hours (9L a/h avg)
Noise 72db @ 30m (full power)

Engine Viper 4S II Water cooled Viper 4S II Air cooled
Capacity 580cc 625cc
Type Rotax Water-cooled, two cylinder, two-stroke Hirth Air-cooled, two cylinder, two-stroke
Power  47 kW (64 hp) @ 6,400 rpm 48 kW (65 hp) @ 6,300 rpm
Fuel 95 - 98 Octane unleaded 2% oil premix 95 - 98 Octane unleaded 2% oil premix
Ignition Dual sparkplug per cylinder Single sparkplug per cylinder (optional dual ignition)
Starting Electric start Electric start and Pull start
Generator 12V DC 15amp = 170w 12V DC 30amp = 250w
T.B.O. (Top and bottom overhaul) 300 - 500 hours 900 - 1000 hours
Drive system HTD Tooth belt via torsional dampener HTD Tooth belt via torsional dampener
Propulsion Integrated thrust and lift Integrated thrust and lift

Goulburn. N.S.W. 2580 Australia
Ph: +61 418649350

Copyright 1990 - 2018