No eyes, no balance, no tactics. What is the secret of these iron marathons?
On April 19, 2026, the humanoid robot Honor Lightning ran a half marathon in 50 minutes and 26 seconds. It was almost seven minutes faster than the world record on a half-marathon among humans and almost two hours faster than the best result of humanoid robots in 2025. It is impossible to compare the car with the athlete directly: a person and a robot pass a distance in different conditions. Much more interesting is different: Lightning showed how much speed depends on the leg device, the choice of engines, the transfer relationship of gearboxes and cooling of drives.
Running from a robot and a human consists of similar phases. One leg stands on the ground and pushes the body up and forward, the second is transferred to the next point of the support. Then the body moves inertia for a short time, gravity pulls it down, and the next support leg again directs the movement upwards. For a person, these phases are familiar, but for a robot, each turns into an engineering task: motors must move their feet quickly, keep the balance, not overheat and not spend too much energy.
Electric motors create torque, that is, the rotation force on the shaft. The higher the moment, the more losses: part of the energy goes into heat. With prolonged running, the heating quickly turns into a speed limiter. Between the engine and the joint usually put the gearbox. This mechanism reduces the speed of rotation and increases the force at the exit. A large gear ratio helps to start from the ground more, but prevents you from quickly transferring the leg forward. A small attitude facilitates rapid movement, but the engine loads more strongly during the support.
Therefore, a running humanoid does not need the most powerful gearbox, but a properly selected bundle of the engine and transmission. Each engine has a mode where the total losses are minimal. According to engineer Avik De, who dismantled the Lightning design, for running at an average speed of about 7 m / s of the optimum is located around the region of 45:1. With this transfer ratio, the calculated power consumption of the robot remains relatively moderate - about 400 watts.
For efficiency you have to pay heat. The knee drive, which usually rests most on temperature limits, should scatter about 150 watts. For humanoid humanoid size at a speed of about 7 m / s, such a heat load is almost inevitable. Air cooling is not enough to constantly divert so much heat from the compact joint. Without a separate cooling system, the engines would quickly go beyond the safe temperature limit.
Lightning has been liquidally refrigerated. According to Honor, thin cooling channels go deep inside the motors, and the pump pumps more than four liters of liquid per minute. Each of the four leg drives has a separate contour. For household and warehouse robots, this scheme is rare, but it was cooling that helped Lightning keep a high pace at a long distance, and not to limit itself to a short snap.
So Lightning has beaten more famous competitors. It’s not about a single secret algorithm or an unknown technology. The robot was assembled for a specific task - a long fast run. For this task, engineers chose large engines, suitable gear ratio and liquid cooling. At half-marathon speed, this configuration works well, but for normal walking, home or production fits worse.
Universal humanoids like Unitree or Agibot are designed for other conditions. It is more important for them to walk steadily, maneuver indoors, do not touch objects, save energy when standing and moving at low speed. For walking, the transfer ratio is about 30:1. At a speed of about 1.5 m / s, this adjustment reduces the loss, but with a long run at a semi-marathon pace, the knee motor begins to warm up much stronger. According to calculations, the heat load can exceed 300 watts, that is, be more than twice as high as that of the running configuration.
Therefore, competitors have additional ways of cooling. When the robot is designed for walking, and it is forced to run for a long time, the drives go beyond the normal mode. Ice or external cooling with such a load does not look strange. They show not the weakness of the design, but the discrepancy of the task with the setting of the machine.
The Honor approach also has disadvantages. Large motors and gearboxes help to run, but add mass, increase joints and worsen the cost-effectiveness when walking. In an apartment, office, hospital or factory, a running machine may be less comfortable than a more compact universal humanoid. Large drives are easier to touch the surrounding objects, and the extra power in everyday tasks turns into additional weight and energy consumption.
Therefore, the result of Lightning is better considered not a victory of the robot over a person, but a demonstration of a narrow engineering setup. The car passed the distance faster than the world record among people, but the comparison remains conditional. A person runs in a dense group, assesses the track, keeps balance, sees obstacles, reacts to rivals and does not use GPS as the main guide. Lightning relies on other strengths: an accurate drive, pre-selected mechanics and external engineering control.
On April 19, 2026, the humanoid robot Honor Lightning ran a half marathon in 50 minutes and 26 seconds. It was almost seven minutes faster than the world record on a half-marathon among humans and almost two hours faster than the best result of humanoid robots in 2025. It is impossible to compare the car with the athlete directly: a person and a robot pass a distance in different conditions. Much more interesting is different: Lightning showed how much speed depends on the leg device, the choice of engines, the transfer relationship of gearboxes and cooling of drives.
Running from a robot and a human consists of similar phases. One leg stands on the ground and pushes the body up and forward, the second is transferred to the next point of the support. Then the body moves inertia for a short time, gravity pulls it down, and the next support leg again directs the movement upwards. For a person, these phases are familiar, but for a robot, each turns into an engineering task: motors must move their feet quickly, keep the balance, not overheat and not spend too much energy.
Electric motors create torque, that is, the rotation force on the shaft. The higher the moment, the more losses: part of the energy goes into heat. With prolonged running, the heating quickly turns into a speed limiter. Between the engine and the joint usually put the gearbox. This mechanism reduces the speed of rotation and increases the force at the exit. A large gear ratio helps to start from the ground more, but prevents you from quickly transferring the leg forward. A small attitude facilitates rapid movement, but the engine loads more strongly during the support.
Therefore, a running humanoid does not need the most powerful gearbox, but a properly selected bundle of the engine and transmission. Each engine has a mode where the total losses are minimal. According to engineer Avik De, who dismantled the Lightning design, for running at an average speed of about 7 m / s of the optimum is located around the region of 45:1. With this transfer ratio, the calculated power consumption of the robot remains relatively moderate - about 400 watts.
For efficiency you have to pay heat. The knee drive, which usually rests most on temperature limits, should scatter about 150 watts. For humanoid humanoid size at a speed of about 7 m / s, such a heat load is almost inevitable. Air cooling is not enough to constantly divert so much heat from the compact joint. Without a separate cooling system, the engines would quickly go beyond the safe temperature limit.
Lightning has been liquidally refrigerated. According to Honor, thin cooling channels go deep inside the motors, and the pump pumps more than four liters of liquid per minute. Each of the four leg drives has a separate contour. For household and warehouse robots, this scheme is rare, but it was cooling that helped Lightning keep a high pace at a long distance, and not to limit itself to a short snap.
So Lightning has beaten more famous competitors. It’s not about a single secret algorithm or an unknown technology. The robot was assembled for a specific task - a long fast run. For this task, engineers chose large engines, suitable gear ratio and liquid cooling. At half-marathon speed, this configuration works well, but for normal walking, home or production fits worse.
Universal humanoids like Unitree or Agibot are designed for other conditions. It is more important for them to walk steadily, maneuver indoors, do not touch objects, save energy when standing and moving at low speed. For walking, the transfer ratio is about 30:1. At a speed of about 1.5 m / s, this adjustment reduces the loss, but with a long run at a semi-marathon pace, the knee motor begins to warm up much stronger. According to calculations, the heat load can exceed 300 watts, that is, be more than twice as high as that of the running configuration.
Therefore, competitors have additional ways of cooling. When the robot is designed for walking, and it is forced to run for a long time, the drives go beyond the normal mode. Ice or external cooling with such a load does not look strange. They show not the weakness of the design, but the discrepancy of the task with the setting of the machine.
The Honor approach also has disadvantages. Large motors and gearboxes help to run, but add mass, increase joints and worsen the cost-effectiveness when walking. In an apartment, office, hospital or factory, a running machine may be less comfortable than a more compact universal humanoid. Large drives are easier to touch the surrounding objects, and the extra power in everyday tasks turns into additional weight and energy consumption.
Therefore, the result of Lightning is better considered not a victory of the robot over a person, but a demonstration of a narrow engineering setup. The car passed the distance faster than the world record among people, but the comparison remains conditional. A person runs in a dense group, assesses the track, keeps balance, sees obstacles, reacts to rivals and does not use GPS as the main guide. Lightning relies on other strengths: an accurate drive, pre-selected mechanics and external engineering control.
