China Nets Its Rocket: Sea-Platform Catch Offers a New Model for Booster Recovery

China just pulled off a first of a different kind. The Long March-10B carrier rocket achieved a fully controlled recovery, staging the world's first net-based capture of a launch vehicle over the South China Sea. A historic breakthrough for reusable rocket technology, and it pushes China firmly into the era of rocket recovery. The payoff is clear: lower commercial launch costs and a stronger competitive position for China's commercial space sector on the world stage.

The tension was real. About eight minutes after liftoff, the first stage was precisely captured by an offshore recovery platform. Engineers who developed the Long March-10B reportedly fought back tears when they saw real-time footage of the stage landing steadily. China has now become the second country in the world to master vertical rocket recovery technology. One expert called it "a precise two-way rendezvous between the rocket and the offshore platform," highlighting the tight coordination that made the capture possible.

China pioneers net-based rocket recovery, marking a historic breakthrough in reusable launch technology.

The mission itself ran like clockwork. At 12:15 pm on July 10, the Long March-10B lifted off from the Hainan Commercial Space Launch Site and delivered its payload into the designated orbit. Six minutes after stage separation, the first stage began its vertical return. It was recovered via a net-capture system on an offshore platform located more than 300 km from the launch site, and the recovery mission was a complete success.

The Long March-10B rocket has a 5-meter diameter and a two-stage configuration, with a liquid oxygen-kerosene first stage and a liquid oxygen-methane second stage. It generates about 890 tonnes of thrust and can carry 16 tonnes to low Earth orbit in reusable mode.

According to Global Times, the China Academy of Launch Vehicle Technology (CALT), under the China Aerospace Science and Technology Corporation (CASC), developed the Long March-10B. The rocket has a diameter of 5 meters and adopts a two-stage configuration. Its core first stage inherits the configuration of the Long March-10A first stage and uses liquid oxygen-kerosene propellant, while the second stage uses liquid oxygen-methane propellant.

The rocket generates about 890 tonnes of thrust at liftoff, with a launch mass of approximately 760 tonnes and a total length of about 63 meters. In reusable mode, it can deliver up to 16 tonnes to low Earth orbit.

Size matters here. Rocket technology expert Kan Lei from the Rocket Academy noted that a 5-meter diameter is currently the mainstream design for heavy-lift launch vehicles, since it allows for larger engines and more propellant to support higher payload capacity. The Long March-10B can meet a wide range of mission needs, including low-Earth-orbit satellite internet constellation deployment and large commercial satellite launches. Its reusability significantly lowers costs while offering high payload capacity and strong cost-performance advantages.

Experts say the return process includes four stages: coast and attitude adjustment, powered deceleration, aerodynamic deceleration, and landing.

During its maiden flight, the Long March-10B ascended for about 3,000 seconds after ignition. Kan Lei explained that during ascent, the first stage's seven liquid oxygen-kerosene engines powered the acceleration. After stage separation, the second stage's single liquid oxygen-methane engine took over. It completed orbit insertion through a sequence of powered flight, coast, attitude adjustment, and re-ignition, while also performing passivation procedures.

The return and landing phase was the core technical validation of this mission. After separating at around 150 seconds into flight, the first stage began descending from above 100 km altitude. It entered the return phase at several times the speed of sound.

Rocket designer Wang Cong broke the return process into four distinct stages: coast and attitude adjustment, powered deceleration, aerodynamic deceleration, and landing. In the first phase, grid fins deploy to adjust re-entry attitude, while the propellant settling system positions fuel for engine restart. In the powered deceleration phase, engines reignite to cut speed before the stage enters denser atmosphere, preventing structural damage from extreme thermal loads.

This is followed by aerodynamic deceleration, where grid fins provide drag while the rocket endures intense heating and aerodynamic stress. Finally, during landing, engineers use a "near-hover" control strategy. It combines grid fins and engine thrust with online trajectory planning to bring altitude and velocity down to near zero, enabling precise capture by the offshore net-capture system.

Most reusable rockets worldwide rely on landing legs. The Long March-10B team took a different path entirely, innovatively adopting a net-based offshore capture system. It offers what experts describe as a "Chinese solution" for large-scale rocket recovery, showcasing a distinct engineering approach.

Technical expert Chen Muye explained that net-based recovery is more forgiving on landing requirements. It eliminates the need for complex landing legs, which reduces structural weight and increases payload capacity. It also allows greater tolerance in landing accuracy by expanding the capture window, and the design can scale to accommodate rockets of different sizes.

The offshore recovery vessel "Navigator" was already in position as the Long March-10B first stage descended over the South China Sea. The platform measures 144 meters long and 50 meters wide, with a draft of 5.5 meters and a full-load displacement of 25,000 tonnes. Featuring a Class 2 Dynamic Positioning (DP2) system, it can counter wind, waves, and currents to hold a precise location and heading, effectively serving as a stable mobile landing site.

The offshore recovery platform "Navigator" is 144 meters long and 50 meters wide, with a draft of 5.5 meters and a displacement of 25,000 tonnes.

As the first stage approached, it decelerated and interfaced with cables driven by pulley systems. The rocket's onboard navigation and positioning systems continuously relayed velocity and position data so controllers could adjust attitude and speed. Meanwhile, the platform's net-capture system monitored the rocket in real time and controlled cable movement through ground systems.

Expert Sun Zhenlian used the same phrase again: "a precise two-way rendezvous between the rocket and the offshore platform." It captures the synchronized coordination that defined the entire operation.

Once inside the net system, the rocket's hooking mechanism deployed and engaged with four well-shaped cables. The rocket descended slowly and was captured precisely. Sun described the hooking system as enduring complex loads during contact, sliding, and tensioning, calling it "like a pair of strong hands firmly gripping the rocket." The net system then delivered buffered deceleration.

Securing the rocket took two more steps. First, auxiliary cables stabilized it from multiple directions. Then an automatic locking platform moved beneath the rocket to clamp and support it, which Sun compared to "fastening a seatbelt," ensuring stability despite wind and waves.

The development team is not slowing down. They plan to keep optimizing performance and advancing reusable technology, with a reused first-stage flight targeted before the end of the year. Kan Lei noted that the maturity of reusable rocket technology directly determines access-to-space capability and cost efficiency. With multiple large satellite internet constellations entering deployment, demand for launches is surging, marked by tight schedules and high frequency that expose the cost and capacity limitations of expendable rockets.

After the successful launch and recovery, aerospace personnel celebrated enthusiastically. 長十乙成功發射並回收後，一眾航天人員都歡呼雀躍。

He added that the successful maiden flight and recovery of the Long March-10B fills a gap in China's low-cost, heavy-lift reusable rocket capability. This will significantly boost competitiveness in the global commercial launch market. Going forward, the rocket will support large-scale constellation deployments in low and medium Earth orbits.

Looking ahead, recovered first stages from the Long March-10A may also be reused for launches. That would contribute flight data for its crewed missions and improve reliability. The Long March-10A, a next-generation crewed launch vehicle, is expected to serve as the "lifeline ladder" for astronauts traveling between Earth and space stations, representing an upgraded integration of the Long March-2F and Long March-7.

China is not stopping at the Long March-10B either. Based on its 5-meter design, engineers are developing a larger liquid oxygen-methane first stage, which will pair with the existing second-stage module to create the Long March-10C, a fully liquid oxygen-methane rocket aimed at commercial missions. Wang Cong said the project is being developed intensively and will further advance the industrialization of China's space transportation sector.

Mao Paishou

** 博客文章文責自負,不代表本公司立場 **

When the Russia-Ukraine war broke out, energy costs in Germany, a country heavily reliant on Russian natural gas, spun instantly out of control. Electricity prices at one point surged sevenfold, forcing ordinary people to dream up all manner of clever tricks to save on their power bills. One of those tricks has become a distinctive sight on German streets: the "balcony solar" system.

To cut power bills, Germans turned balconies into power plants.

"Balkonkraftwerk": Miracles On Balconies

This simple generating setup costs just a few hundred euros, yet more than 1.33 million units have been installed across Germany in three years. The German government has even amended the law, granting tenants with no rooftop of their own priority installation rights.

What Germans call the "Balkonkraftwerk", or "balcony power plant", is actually just one or two solar panels hung outside the railing, an inverter the size of a shoebox, and a plug that goes into a household socket. The current then flows back into the home: the inverter sets its output voltage slightly higher than the 230V household supply, so solar power feeds in reverse into the wiring. A small storage battery can be added to keep the power coming at night.

The "Balkonkraftwerk": railing-hung panels, a shoebox-sized inverter, one plug.

The principle is not complicated. It works rather like a water supply system. Pipes maintain a steady pressure; turn on the tap and the pressure difference pushes the water out. The grid works the same way. China's standard household voltage is 220V and Germany's is 230V. The inverter in a balcony photovoltaic module simply nudges its output voltage slightly above the socket voltage, pushing solar power back in.

Once the current enters the socket, it is consumed on the spot, "drunk up" by the appliances at home. Less electricity is drawn from the grid, and the meter turns more slowly. If no appliances are running, then in areas where bidirectional metering is permitted, the surplus power flows out of the home along the mains line and back into the grid.

A Few Hundred Euros, Real Money Back

A "balcony power plant" sells for roughly 200 to 500 euros, depending on output. The best-selling 800W model goes for about 350 euros. A solar-plus-storage package with a battery costs between 800 and 1,500 euros.

A granny who lives in Stuttgart finds a 300W system enough to cover her basic needs: lighting, the router and electric fans. She now checks the next day's sunshine forecast every evening. If the sun will be out, she schedules a bike charge or runs the dishwasher. "Save whatever you can," she says.

Granny's 300W system covers her lights, router and fans.

Her nightly ritual: the sunshine forecast. "Save whatever you can."

Weyland, a young man in the northern city of Kiel, hung two panels with a combined output of 600W on the balcony of his rented apartment. In good weather they cover half of his daily electricity use. The whole system cost under 500 euros, yet saves him more than 90 euros a year, a payback period of about five years. These days he spends his time glued to the app, watching the generation figures roll in.

Kiel renter Weyland's two balcony panels total 600W.

In southern Germany, where the sunshine is better, a standard 800W system generates about 750 to 850 kWh a year. At last year's average price of 0.39 euros per kWh, that puts up to 295 to 334 euros a year back in the user's pocket.

For an ordinary household consuming 3,000 kWh a year, saving is about  25 to 28 percent. A single-person household using around 1,500 kWh could ideally save 50 to 57 percent.

No Roof? No Problem

Europe used to put solar panels on rooftops. But more than half of Germany's population lives in rented housing, the highest share in the EU. That means no roof, no land, nowhere to put panels, and no eligibility for the complicated installation and grid-connection approval process.

No roof, no problem: balcony solar is the tenant's lifesaver.

That was when Chinese manufacturers stepped up, Anker Innovations, EcoFlow and Zendure among them. They launched lightweight, low-cost balcony solar kits that skip the tedious paperwork and are far easier to use.

Panels have been slimmed down from the traditional 20kg to just 3 to 5kg. Hook-style railing clamps fix them in place with a few screws. Some models can simply be lashed on with metal cable ties, and they can be taken down easily when moving.

Voltage has dropped from the 600V to 1,000V high-voltage direct current of rooftop solar to a safe 30V to 60V. The plug goes straight into an ordinary socket, and monitoring is done entirely through an app. Installation and use are virtually "zero-threshold". German young people love it. Chinese manufacturers have turned solar "engineering" into a consumer electronics product for everyone.

Berlin Gives the Green Light

The German government has also given the green light. A legislative amendment in May 2024 allows self-installation without prior approval; simple registration afterwards is enough. Balcony solar is now a "privileged installation", on par with disabled-access facilities and EV charging points. Landlords and owners' committees may not block installations on grounds such as "spoiling the view". A landlord who wants to refuse must prove a safety hazard; if the tenant can fix the hazard, the installation goes ahead anyway. The government also waived the 19 percent VAT, and cities including Berlin and Stuttgart have rolled out dedicated subsidies of up to 500 euros. All income from generation is exempt from personal income tax.

With the government "loosening the reins", balcony solar has grown rapidly. Around 260,000 units were added in 2023. The figure soared to 435,000 in 2024, and another 430,000 or so were registered in 2025. That is 1.1 million units installed at lightning speed in three years. By May this year, cumulative installations had reached 1.33 million, the equivalent of more than a thousand German households signing up every day.

Policy green light: install first, register afterwards.

Other European countries have followed suit. The Netherlands had reached 600,000 cumulative installations by the end of 2025, the highest penetration after Germany, with nearly 5 percent of households equipped. Austria has installed 250,000 units, Italy 200,000 and Belgium 150,000.

Made in China, Invisible at Home

Of the solar panels imported into Europe, 98 percent come from China, and 70 percent of micro-inverters are Chinese-supplied. In balcony energy storage, Chinese companies had already secured the first seven places of the top ten best-seller spots in Europe as early as the third quarter of 2024. Industry forecasts see global installed balcony solar capacity exceeding 50 gigawatts by 2030, with China likely to claim more than 40 percent of it.

Yet in China itself, these products are practically invisible in cities. For one thing, electricity in China is genuinely cheap. For another, China follows a "centralized plus distributed" path.

The northwest builds gigawatt-scale centralized solar bases across deserts and the Gobi on a massive scale, using ultra-high-voltage transmission to solve the geographic mismatch. The east develops distributed solar on factory and detached-house rooftops. Rural rooftops easily run to tens or even hundreds of square meters, accommodating 20kW to 50kW systems. That is dozens of times the generating capacity of balcony solar.

With no domestic demand to speak of, Chinese companies have nonetheless struck overseas demand with pinpoint precision and taken command of the global balcony solar market. The same story has played out with saddle-style window air conditioners, fully automatic lawnmowers, electric-assist bicycles and AI game-tracking cameras. To Western politicians, China's technological rise is a threat. But to ordinary people abroad, Chinese products have made life better, time and again.