ALR-S for 

Stern Recoveries

Converting a standard stern ramp to a fully autonomous recovery system is feasible with ALR-S.
Sealartec’s stern ramp technology can be seamlessly integrated into both new vessels and existing platforms, enabling the fully autonomous and safe recovery of both USVs and manned boats in sea states up to 6.
Today, amongst our clients are tier one companies in the civilian and defense market alongside government clients.

ALR-S

Autonomous Recovery for Stern System

Servo Hauling Winch

Capture System for Stern Ramp

Capture System for Stern Ramp

Servo Hauling winch

capture system
for Stern ramp

capture system
for Stern ramp

Boat connection unit

Bow Capture Unit

LPS

command & Control

User Friendly

Intuitive user interface touch screen monitor

Intuitive user interface
touch screen monitor

safety

Additional Hand Held Safety controller with push butons

Additional handheld safety
controller with push buttons

connection

Standalone or connected to ship command and control

Standalone or connected to ship command and control

requirements

Configurable for user requirements

Configurable for user requirements

Stern Recovery process

Identification & Capture - side recovery

  1. Drive boat to a wide capture zone aft of stern ramp
  2. Match boat speed to ship speed
  3. ALR-S identifies & captures boat autonomously
  4. Boat captured and reduces throttle to zero
  5. Boat hauled onto stern ramp under controlled tension

THE CHALLENGE- STERN RAMPS L&R

Successfully navigating a boat up the ramp requires advanced driving skills due to the high relative speed, resulting in substantial kinetic energy and impactful loads. The increased relative velocity induces bow motions, leading to positioning inaccuracies and heightened slamming loads on the stern ramp. The critical phase is when the boat, with higher relative velocity, maneuvers aft of the ship, requiring precise handling to fit into the notch. However, turbulent wake and the ‘sloshing’ effect diminish maneuverability significantly leading to collisions with the ship’s stern.
Consequently:

Entering the stern in high sea states is perilous and often requires multiple attempts.
The boat operator needs exceptional skill, daring, and extensive training.
Recovering a USV up a stern ramp is practically impossible in high sea state using this old-school methodology

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