The Rocket Equation Problem
For decades, the only way to reach orbit has been to strap a payload to a conventional rocket. While companies like SpaceX have made rockets reusable, the fundamental physics remain costly. Rockets are mostly fuel by mass, and an enormous amount of energy
is spent just to escape Earth's gravity and thick lower atmosphere. This reliance on massive, fuel-guzzling machines creates a significant financial barrier, keeping space access exclusive to well-funded corporations and governments. The global satellite launch services market is projected to grow to over $11 billion by 2030, highlighting the immense demand for a cheaper, more efficient alternative to break this expensive cycle.
A Radically Different Approach
Enter Longshot Space. Founded in 2020 by CEO Mike Grace and CTO Nathan Saichek, the Oakland-based company is reviving a century-old idea with modern technology: kinetic launch. Instead of burning propellant, Longshot aims to use a ground-based accelerator to hurl a projectile to hypersonic speeds. The concept itself isn't new, with historical precedents like the V-3 cannon from World War II and Project HARP in the 1960s. Longshot’s key innovation is its 'multi-injection' pneumatic cannon. A projectile travels down a very long tube and is accelerated by a series of precisely timed injections of compressed gas from the sides. This method allows the payload to build incredible velocity without any onboard combustion.
How the 'Space Gun' Works
Imagine a projectile with a long, tapered tail moving down a massive barrel. Instead of one big push from behind, tanks of compressed gas are spaced along the tube. As the projectile passes, each tank fires a burst of gas against its angled tail, squeezing it forward like toothpaste out of a tube. This side-injection technique, controlled with sub-millisecond precision, allows the projectile to travel much faster than the gas itself. The goal is to reach speeds high enough to punch through most of the atmosphere. Once at a high altitude, a small, secondary rocket motor on the payload could fire to provide the final push needed to achieve a stable orbit. The ground-based launcher itself would be entirely reusable, made from civil engineering materials like steel and concrete.
The Promise of Extreme Affordability
By moving the launch infrastructure to the ground and eliminating the need for a massive first-stage rocket, Longshot believes it can dramatically reduce launch costs. The company suggests its system could eventually bring the cost of launching cargo to orbit down to just $10 per kilogram, a figure orders of magnitude cheaper than current rocket-based systems. This isn't just a theoretical goal; the company has attracted serious attention. Investors include OpenAI CEO Sam Altman and billionaire Tim Draper, and Longshot has been awarded contracts with the U.S. Air Force to develop its technology for hypersonic testing. An initial market for the company is providing affordable, high-cadence testing for hypersonic weapons components, a service that could prove highly valuable to defense agencies.
The 'Longshot' Hurdles Ahead
The company's name is fitting, as the technical challenges are immense. One of the biggest concerns with any kinetic launch system is the extreme acceleration, or G-forces, exerted on the payload. Longshot addresses this by making its launcher incredibly long—the final version could be over 10 kilometers. By accelerating the payload over a much greater distance, the peak G-forces are reduced to levels that ruggedized electronics and satellites can withstand. Another major challenge is surviving the violent transition from the launch tube into the thick lower atmosphere at hypersonic speed. Despite these obstacles, Longshot has already built and tested prototypes that can accelerate payloads past Mach 4, proving the core concept is sound.
