A Cannon to the Cosmos
The concept of a kinetic launcher, often dubbed a 'space gun,' sounds like something straight out of science fiction, but the principle is grounded in physics. Instead of relying on chemical propellants to slowly fight gravity, a kinetic system uses ground-based
infrastructure to accelerate a payload to immense speeds before it even begins its ascent. Longshot Space, an Oakland-based company founded in 2020, is developing its own version of this technology. Their system is described as a multi-injection gas gun, a long tube designed to fire projectiles at hypersonic speeds. The goal is to provide the initial, and most energy-intensive, 'kick' needed to escape the densest part of Earth's atmosphere, radically changing the economics of space access.
Trading Fire for Velocity
A traditional rocket is a marvel of engineering, but it’s also fundamentally inefficient. The vast majority of a rocket's mass—sometimes over 90%—is just fuel needed to lift other fuel. This is the tyranny of the rocket equation. Kinetic launch systems sidestep this problem by keeping the heavy acceleration infrastructure on the ground. By using a ground-based launcher to impart massive velocity, the payload itself needs far less (or even no) onboard propellant for the initial ascent. This could dramatically reduce launch costs, complexity, and the time between launches. Longshot’s vision is to create a fixed, reusable system capable of frequent and affordable hypersonic testing and, eventually, satellite deployment.
The Minds Behind the Machine
Longshot Space was founded by Mike Grace, who began building the first prototype in his garage. The company has since grown, attracting investors and a team of engineers to tackle what it calls one of aerospace's hardest infrastructure problems. Their mission extends beyond just launching satellites; they aim to turn space into a viable human habitat by drastically lowering the cost of getting there. By focusing first on creating affordable access for hypersonic testing for clients like the military, Longshot is building a commercial foundation for its more ambitious orbital goals. This phased approach provides a revenue stream while allowing them to scale their technology from their current 60-foot prototype to a much larger system.
Surviving the Launch
The primary challenge for any kinetic launcher is not just achieving speed, but ensuring the payload survives. The acceleration forces involved are staggering, potentially reaching over 10,000 times the force of Earth's gravity (10,000 Gs). For comparison, a fighter pilot might experience 9 Gs. Most current satellites are not built to withstand such crushing forces and would be instantly destroyed. Any payload must be specifically engineered or 'ruggedized' to survive the launch. Another immense hurdle is atmospheric friction. A projectile hitting the thick sea-level atmosphere at hypersonic speeds (over five times the speed of sound) generates incredible heat and stress, requiring robust thermal shielding much like a re-entering spacecraft.
The Billion-Dollar Payoff
Despite the immense engineering challenges, the potential reward is transformative. If successful, kinetic launch systems could slash the cost of reaching space. While a Falcon 9 launch costs around $6,000 per kilogram, some kinetic launch proponents project costs could fall to under $2,500 per kilogram, or even less. Such a dramatic price reduction would democratize access to space, making it feasible for universities, smaller companies, and research institutions to deploy their own satellite constellations. It would enable a higher frequency of launches with zero in-atmosphere emissions from the launch itself. This could accelerate the development of space-based infrastructure, from global internet services to advanced Earth observation platforms.
