Boston Dynamics Stretch Gen 2 Redefines Trailer Unloading
Boston Dynamics' second-generation Stretch robot, built on over 100,000 hours of real-world data, delivers enhanced reliability and simplified maintenance for warehouse logistics, with DHL committing to over 1,000 units.
Boston Dynamics unveiled Stretch Gen 2, an autonomous trailer-unloading robot designed to improve reliability and reduce downtime in warehouses. The new model leverages data from more than 100,000 operating hours and tens of millions of boxes handled by its predecessor, directly targeting labor strain and bottlenecks in logistics operations.
The robot can unload up to 1,000 cases per hour, a rate dependent on case weight and stacking neatness. It requires minimal operator training, starting work with a single 'Play' button press after positioning. Brian Donnelly, vice president and general manager of logistics robotics at Boston Dynamics, highlighted the operational imperative, stating, "customers rely on Stretch to keep freight moving and that robot downtime creates costly loading dock backlogs."
Engineering innovations slash maintenance time and complexity
Key redesigns focus on durability and serviceability to maximize uptime. An 81% reduction in internal cabling cuts weight, cost, and potential failure points. The robot now uses standardized high-strength fasteners and heavy-duty automotive-grade connectors sourced via parent company Hyundai's supply chain to withstand vibration.
These changes dramatically simplify repairs. A full swerve drive assembly swap now takes about one hour, down from a full day previously. New onboard diagnostics and maintenance tools further empower customer teams. Continuous rotation joints that move beyond 360 degrees eliminate hard stops, reducing mechanical stress.
Optimized power and safety features enable continuous operation
Extended battery life and rapid charging support unbroken workflow. The battery lasts for two full shifts and can be fast-charged to 90% capacity in approximately 75 minutes. Enhanced safety protocols include a lower, recessed emergency stop button and redesigned exterior panels. These changes prevent accidental shutdowns and damage from falling boxes, which were a common cause of unintended stops.
The vision system is pre-trained for package detection, requiring no programming, and onboard lighting allows operation in dark trailers. The upgraded gripper uses new valve systems and precise sensing for improved grasping, enabling multiple box picks per arm motion to boost efficiency.
| Feature | Improvement |
|---|---|
| Internal Cabling | Reduced by 81% |
| Swerve Drive Swap Time | ~1 hour (was 1 day) |
| Battery Fast Charge (to 90%) | ~75 minutes |
| Operational Battery Life | 2 shifts |
| Max Unload Rate | Up to 1,000 cases/hour |
Proven deployment with major logistics partners validates commercial readiness
Commercial partnerships confirm the robot's track record. DHL signed a memorandum of understanding in May to introduce over 1,000 additional Stretch robots. Hyundai Motor Group noted Stretch unloaded over 20 million boxes since 2023. At DHL sites, units have achieved peak rates of up to 700 boxes per hour, with earlier trials at Lidl exceeding 500 cartons per hour.
The robot is deployed at multiple customer sites, including Gap and Maersk, with installations completed within two weeks. DHL and Boston Dynamics are also expanding Stretch's use beyond pure unloading to include picking and sorting tasks inside distribution centers.
Performance continues to improve through software. The robot runs on a redesigned onboard computing platform that receives regular updates, on average monthly. Boston Dynamics recorded a 24% increase in unload rate across its fleet after the most recent software update, enhancing case detection and motion planning without any hardware changes. This commitment to continuous software refinement ensures ongoing gains in unloading performance.
