Slipway and stern entry system with single wheel drive units
  • Single wheel drive units on slipway slope
  • Stern ramp with single wheel drive units

SWL:                                                 Up to 12 tonnes
Wheel drive system:                     Hydraulic
Single wheel drive units:             Manually adjustable to different hull shapes
Slipway operation:                        Semi-automatic with single-operator
Slipway slope length:                   According to customers request
Slipway angle:                               Up to 12 ° slope angle
Slipway access/entrance:           Via submerged wheel units on stern ramp
Boat guiding system:                   Wheel units and guide poles on ramp
Stern ramp dimensions:              Designed to purpose and vessel interface
Ramp movement:                         Hydraulic operated cylinders

  • Remote control from daughter craft
  • Various remote control options on vessel side
  • Power and control system redundancy
  • Emergency launch and recovery by accumulator and UPS
  • Parking position for additional boat(s)
  • Higher slope angle and/or SWL (if possible/feasible)

Slipway and stern entry systems with single wheel drive units

PALFINGER’s hydraulically powered, semi-automatic slipway system consists of several single wheel drive units in parallel rows. The tilt, height and distance between the wheels can be manually adjusted to conform to a range of daughter craft hulls.

A daughter craft can engage the slipways at a range of speeds up to seven knots higher than the speed of the mother vessel. 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 will 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 the fail-safe brakes on the drive wheels.


Test and operational use of this slipway system have been performed in sea states 3 with mother vessel steaming ahead with low speed.

Safe operations at higher sea states may be possible but is highly dependent on:

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


Wheel drive unit configuration:               1 wheel on each wheel drive unit
Wheel angle and transverse spacing:    Manually adjustable
Brakes:                                                          1 for each wheel
Hydraulic motors:                                       1 for each wheel
Over-running clutches:                              1 for each wheel
Number of single wheel drive units:       Depending on length of slipway
Wheel diameter:                                          Ø 434 mm (Foam filled)
Max. freewheel speed, inlet:                    0-240 m/min (0-7 knots)
Drive assist speed, in and out:                 0-25 m/min (0-0.8 knots)
Max. slipway slope angle:                         up to 12°
Max. payload for slipway:                          up to 12 tonnes
Max load, each wheel:                               2 tonnes
Weight (each wheel drive unit):               Approximately 420 kg

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Slipway and stern entry systems

English 2021
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