Riley Cross

Robotics engineer and combat sport analyst. Riley covers humanoid development, BattleBots, and the machines pushing physical limits.

Articles

• Tiangong Ultra vs. Unitree Superman: What Robot Sprint Records Really Measure — A practical engineering comparison of humanoid sprinting, from actuator trade-offs to the difference between peak speed and a timed 100-metre race.
• Inside RoboCup Incheon: The Coordination Challenge Behind 11-vs-11 Robot Soccer — RoboCup's first full 11-vs-11 humanoid match was a milestone. Here is why perception, role assignment and reliable teamwork become harder as teams grow.
• The Humanoid Biomechanics Breakdown: Understanding the 2.88-Metre Jump — A reported 2.88-metre humanoid high jump raises important questions about launch energy, body configuration, landing control and fair record comparisons.
• Autonomous Obstacle Navigation: What Humanoid Wall Crashes Can—and Cannot—Tell Us — Viral training crashes expose the importance of stopping distance and safety planning, but video alone cannot diagnose a robot's sensors or software.
• Bipedal Endurance Benchmarks: From 160 Minutes to a 50-Minute Half-Marathon — Beijing's winning humanoid half-marathon times changed dramatically between 2025 and 2026. Here is how to interpret the results without inventing hardware details.
• Inside the URKL Belt Race: The Engineering Demands of Humanoid Impact — EngineAI's humanoid combat competition puts balance, impact tolerance and serviceability under pressure. Here is what the published tournament structure actually establishes.
• BattleBots Pro League Format Decoded: Why Group Stages Change Pit Strategy — The 24-robot Pro League puts repeated fights before knockout rounds. Learn why scheduling, repairs and opponent-specific configurations matter as much as one big hit.
• The Death of the Ground Game? Why Combat Robot Forks Still Matter — Forks and wedgelets can decide how a weapon meets its opponent, but ground clearance creates compromises in traction, reach, strength and arena mobility.
• Pneumatic vs. Flywheel Flippers: Where the Launch Energy Comes From — Stored gas pressure and rotating inertia offer different ways to power a combat robot flipper. The useful comparison is energy delivery, recovery, control and safety.
• Telemetry in the Arena: Turning Robot Logs into Better Pit Decisions — CAN-bus data and onboard logging can help explain combat robot failures. Here is a practical, rules-aware approach that does not depend on an uninterrupted cloud link.
• Robot Beats Usain Bolt's 100m World Record at the 2026 World Humanoid Robot Games — A humanoid robot named Lightning ran 100m in 9.32 seconds at Beijing's 2026 World Humanoid Robot Games, beating Usain Bolt's human world record.
• URKL Explained: Inside the World's First Commercial Humanoid Robot Combat League — URKL launched in Shenzhen in February 2026 as the first commercial humanoid robot free-combat league. Here's how it works and why it matters.
• Unitree’s “Superman” Robot Confirmed: 12.66 m/s Speed and a 2-Metre Jump — Unitree confirmed its Superman humanoid reached 12.66 m/s and cleared a two-metre jump, edging past recorded human top-end speed.
• World Records, Rubik's Cubes, and Basketball Shots: The Robots Rewriting the Record Books — From a Rubik's Cube solved in 0.103 seconds to a basketball shot from 24 metres, machines are setting benchmarks in 2025 and 2026 that would have seemed impossible a decade ago.
• A Robot Just Broke the Half-Marathon World Record — And It Wasn't Even Close — In April 2026, a humanoid robot running for Honor crossed the finish line in Beijing in 50 minutes and 26 seconds — more than seven minutes faster than the human world record.
• RoboMaster, Robot Football, and the Rise of Combat-Style Robotics Competitions — While humanoid sprinting grabs headlines, combat robotics has been quietly building a massive following — and producing engineers who now power humanoid leagues, drone racing, and RoboCup alike.
• Meet Bolt: The Fastest Humanoid Robot Ever Built — Chinese startup MirrorMe Technology has unveiled a 175cm humanoid robot with a peak speed of 10 metres per second — within touching distance of Usain Bolt's all-time sprint record.
• Inside the World's First Vision-Only Autonomous Drone Racing Championship — At A2RL 2026 in Abu Dhabi, 14 teams raced drones using nothing but a single camera and a motion sensor — no LiDAR, no external computing. Here's what happened.
• BattleBots 2025 Power Rankings: The Heavyweights That Define the Season — A deep look at the BattleBots robots winning right now — the weapons, builders, and design choices that separate the elite from the rest of the 250-pound bracket.
• RoboCup 2024: The Robot Soccer Championship With a 2050 Deadline — Every year, teams of autonomous robots compete at the RoboCup World Championship. The long-term goal — stated explicitly — is to beat the human FIFA World Cup winners by 2050.
• Unitree H1: The Humanoid Robot That Runs Faster Than Most People — Chinese robotics company Unitree's H1 humanoid robot reached a running speed of 3.3 meters per second — faster than the average human jog — using reinforcement learning trained entirely in simulation.
• Boston Dynamics Retires Hydraulic Atlas — The New Electric Model Is Something Else — After years of viral backflips and parkour, Boston Dynamics quietly killed its hydraulic Atlas in April 2024 and unveiled a fully electric replacement that may be the most capable humanoid ever built.
• Inside the Battlebox: How BattleBots Built the World's Most Dangerous Arena — The Battlebox has contained 250-pound machines with spinning weapons that store the kinetic energy of a car crash. Here is the engineering behind the arena that makes it survivable — for spectators, at least.
• BattleBots' Most Dangerous Machines Right Now — and What Makes Them Win — Combat robotics at the 250-pound weight limit has converged on a handful of weapon configurations that dominate the competition. Here is what makes the current top-tier BattleBots actually work.
• Cassie the Robot Ran a 5K Without Falling Over — Here's What Made It Possible — In 2021, Agility Robotics' bipedal robot Cassie completed a 5-kilometer run on a single battery charge. The achievement required solving problems in reinforcement learning and bipedal control that researchers had worked on for decades.