Spin Launch: Flinging Satellites to Space

For decades, reaching orbit has required massive rockets, millions of gallons of combustible fuel, and complex engineering to fight gravity. A California-based company called SpinLaunch is attempting to change this paradigm entirely. By utilizing a massive centrifuge to literally throw satellites into the upper atmosphere, the company aims to drastically reduce the cost and environmental impact of space access. This technology moves away from chemical propulsion for the first stage of flight and relies instead on kinetic energy.

The Mechanics of Kinetic Launch Technology

The concept behind SpinLaunch is theoretically simple but mechanically complex. Instead of relying on a massive booster rocket to lift a payload off the ground, the system uses a vacuum-sealed centrifuge. This device, which looks like a massive yo-yo on its side, spins a launch vehicle at hypersonic speeds before releasing it through a vertical exit tube.

How the Suborbital Accelerator Works

The company has built a working test platform known as the A-33 Suborbital Mass Accelerator at Spaceport America in New Mexico. The system operates through the following steps:

• The Vacuum Chamber: The accelerator is housed inside a steel vacuum chamber that is 33 meters (108 feet) in diameter. By removing the air, the system eliminates aerodynamic drag and heat friction during the spin-up process.
• The Tether: A carbon fiber tether holds the launch vehicle. A powerful electric motor spins this arm.
• The Release: Once the arm reaches the required velocity—thousands of miles per hour—the tether releases the vehicle. It shoots up a “chimney” exit tube, piercing a membrane that maintains the vacuum, and enters the atmosphere.
• Second Stage Ignition: The kinetic throw does most of the heavy lifting, getting the vehicle high into the mesosphere. Once at the peak of its coast, a small rocket engine ignites to provide the final push needed to achieve orbital velocity.

This hybrid approach means the rocket carried inside the projectile can be significantly smaller and cheaper than a standard ground-launched rocket.

Recent High-Velocity Tests at Spaceport America

The snippet provided highlights successful high-velocity tests, which refer specifically to the campaign SpinLaunch conducted throughout 2022. In October 2022, the company completed its tenth flight test from the New Mexico site. This was a critical milestone because it was not just a test of the launcher, but a test of the payloads inside.

During Flight Test 10, SpinLaunch partnered with NASA and other commercial partners to fly actual payloads. The goal was to answer the biggest question surrounding kinetic launch: can sensitive electronics survive the launch?

Surviving 10,000 Gs

The physics of spinning a rocket in a circle at hypersonic speeds generates immense G-forces. Payloads inside the SpinLaunch vehicle are subjected to approximately 10,000 times the force of gravity. For context, a fighter pilot passes out around 9 Gs, and a standard rocket launch rarely exceeds 6 Gs.

The October 2022 test proved that standard satellite components could be “ruggedized” to withstand these forces. The test successfully launched payloads from NASA, Airbus, and Cornell University. After the vehicle was recovered, engineers confirmed that the electronics and sensors remained functional. This validation is essential for the company’s business model, as it proves standard off-the-shelf satellite components can be adapted for kinetic launch without needing to be reinvented from scratch.

Reducing Rocket Costs and Emissions

The primary driver for this technology is cost. Traditional vertical takeoff rockets must carry nearly all their own fuel. This creates a difficult cycle known as the “rocket equation,” where you need more fuel to lift the fuel you already have. By keeping the propulsion system for the first stage on the ground (the electric motor), SpinLaunch changes the math.

Economic and Environmental Benefits

• Fuel Reduction: SpinLaunch estimates that their system eliminates the need for the massive first-stage booster used in traditional rockets. This reduces fuel consumption by roughly 70 percent.
• Cost Per Launch: The company is targeting a price point of under $500,000 per launch. In comparison, a ride on a SpaceX Falcon 9 Transporter mission costs roughly $275,000 for a very small payload, but you have to wait for a shared ride. Dedicated small launchers like Rocket Lab’s Electron cost roughly $7.5 million per flight.
• Cadence: Because the system is electric and ground-based, it can be reset quickly. SpinLaunch aims to eventually launch five times per day.

Scaling Up: The L100 Orbital Accelerator

While the A-33 accelerator in New Mexico has proven the physics work, it is too small to put objects into orbit. It is strictly a suborbital test bed. To reach the speeds necessary for orbit, SpinLaunch is developing the L100 Orbital Mass Accelerator.

The L100 will be three times larger than the current test site. It is designed to spin the launch vehicle to 5,000 miles per hour before release. The company is currently scouting coastal locations for this massive facility, as the projectile needs to launch over the ocean for safety reasons. The target timeline for operational orbital flights is set for the mid-2020s, potentially as early as 2026.

Challenges and Limitations

Despite the successful tests, kinetic launch is not a solution for every space mission. The extreme G-forces mean that this system will never be used for human spaceflight. Astronauts cannot survive 10,000 Gs.

Furthermore, large optical telescopes (like the James Webb Space Telescope) involve mirrors and delicate instruments that might be too fragile for the violent spin of the launch. The system is best suited for ruggedized communication satellites, fuel tankers, and raw materials needed for orbital construction. The company must also solve the engineering challenge of the exit membrane. Every time a rocket shoots out of the vacuum chamber, it punches a hole in the seal, which must be replaced before the next launch. SpinLaunch has developed a fast-acting mechanical shutter system to solve this, ensuring the vacuum is re-established quickly for the next spin.

Frequently Asked Questions

Can humans fly on SpinLaunch? No. The human body can only withstand about 9 Gs of force for short periods. The SpinLaunch system exerts 10,000 Gs on the payload, which would be instantly fatal to a human.

How fast does the projectile go? In the A-33 test accelerator, speeds reach over 1,000 mph. For the upcoming L100 orbital system, the release speed will be approximately 5,000 mph (Mach 6).

Does the projectile have an engine? Yes. The centrifuge only provides the initial velocity to get through the thickest part of the atmosphere. Once the projectile reaches high altitude, a small rocket engine inside the vehicle ignites to push it the rest of the way into orbit.

Who is funding SpinLaunch? The company has raised substantial capital from investors including Kleiner Perkins, Google Ventures, and Airbus Ventures. They also have a Space Act Agreement with NASA.

Where is the launch site? The current test site is at Spaceport America in New Mexico. The future orbital launch site location has not been finalized but will likely be a coastal region to allow for launches over the ocean.