Model PQBS-D-C

Model PQBS-D-C

Modular slipway system for open deck installation
  • Modular system design for easy installation and retrofit on open deck
  • Drivable slipway frame with rollers and hydraulic drive mechanism
  • Quad wheel drive units mounted on slipway frame
  • Twin jib crane for outboard deployment of slipway frame
  • Constant tension winches for outboard support and control of frame

SWL and boat legth:                          Up to 22 tonnes and 14 meters
Quad wheel drive system:                Hydraulic
Quad wheel drive units:                    Self-adjusting and automatically adapting to different hull shapes
Slipway operation:                             Up to Sea State 6 (with single-operator)
Outboard frame deployment:         By twin jib crane
Slipway LARS angle:                         Up to 12° slope angle 
Slipway access/entrance:                Via submerged quad wheel units on slipway frame
Boat guiding system:                        Tilting quad wheel units and guide rails or deflector flaps
Slipway frame dimensions:             Designed to purpose and water crafts to be used
Slipway frame suspension:             Load carrying bogie wheels and CT-winches with interface towards cradle
Horizontal frame movement:          By pinion drive, folding jibs and CT-winches
Vertical frame movement:               By telescopic jibs and CT-winches
Intercafe to deck strucure:             Prepared for bolting to counter foundations in deck structure

  • Higher vertical outboard frame travel (if possible/feasible)
  • Optimized SWL and slipway frame size
  • Dedicated hydraulic power unit (HPU)
  • Containerized HPU and control systems
  • Power and control system redundancy
  • Radio remote control from daughter craft
  • Various remote control options on vessel side

Slipway and stern entry systems with quad wheel drive units

PALFINGER's hydraulically powered, semi-automatic slipway system consists of several wheel drive units (quad units) in two (or multiple) rows that rotate on axes to automatically adapt the slipway to the hull shape of a daughter craft during launch and recovery operations.

A daughter craft can engage the slipways at a range of speeds, up to seven knots higher than the speed of the mother vessel with some systems. When a boat enters the slipway the overrunning clutches allow free rotation of the wheels in the recovery direction until the boat speed and wheel drive speeds match.

At that point, the hydraulically powered wheel drive units take over under single-operator control and dock the daughter craft safely inside the slipway. End stoppers automatically set the craft in parking and stowage positions and engage failsafe brakes on the wheel drives.


The structural strength of the system is high and is normally not the limiting factor. Test and operational use of PALFINGER slipway systems have been performed in sea states above seven with the mother vessel steaming ahead at low speed.

Safe operations at high sea states are highly dependent on:

  • Mother vessel heading and speed
  • Mother vessel responsiveness (RAO Profile)
  • Waves and wind pattern
  • Boat driver’s skills


Wheel drive unit configuration:          4 wheels on each wheel drive unit
Brakes:                                                     1 for each wheel
Hydraulic motors:                                  1 for each wheel
Over-running clutches:                         1 for each wheel
Number of quad wheel drive units:    Depending on length of slipway
Length of quad wheel drive units:      1,526 mm
Width of quad wheel drive units:        960 mm
Wheel diameter:                                     Ø 600 mm (Foam filled)
Wheel drive units tilt mechanism:      2x Bearing arrangement
Wheel drive unit tilt range:                   +/-20°
Max. freewheel speed, inlet:                0-240 m/min (0-7 knots)
Max. freewheel speed, outlet:             0-35 m/min (0-1.1 knots)
Drive assist speed, in and out:             0-25 m/min (0-0.8 knots)
Max. depth for installation:                   2 meter below water surface
Max. load, each wheel:                          4 tonnes
Weight (each wheel drive unit):           Approximately 725 kg

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Slipway and stern entry systems

English 2021
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