A Ground-Based Revolution
For over sixty years, accessing space has meant one thing: chemical rockets. But the massive cost and complexity of building vehicles that carry all their own fuel has created a high barrier to entry. Longshot Space, an aerospace startup from Oakland,
California, is developing a radical alternative. Their technology is a ground-based kinetic launch system, which is a fancy way of saying they are building an enormous gun to shoot payloads to hypersonic speeds. The core idea is to do most of the hard work of acceleration on Earth, using a fixed, reusable piece of infrastructure instead of a disposable, fuel-guzzling rocket. Founded by CEO Mike Grace and CTO Nathan Saichek, the company aims to drastically lower the cost of space launches. They believe this will transform space from a niche destination into a viable habitat and commercial zone.
How to Fire a Satellite Like a Bullet
Longshot's system is technically a 'pneumatic cannon' that uses compressed gas, not combustion. The concept builds on older ideas like the V-3 cannon and Project HARP from the 1960s, but with modern technology. The projectile, carrying the satellite, sits in a very long tube. Instead of one big push from behind, Longshot’s key innovation is 'side injection'. As the projectile speeds down the barrel, precisely timed bursts of compressed gas are injected from ports along the sides. These jets of gas push against a long, tapered tail on the projectile, squeezing it forward like toothpaste from a tube. This clever technique allows the projectile to travel much faster than the gas itself, enabling it to reach the incredible velocities needed for orbit. After exiting the barrel at hypersonic speed (over Mach 5), the payload would still need a small, attached rocket motor for the final push to circularize its orbit.
The Promise: Cheaper, Faster, and More Frequent
The primary advantage of this approach is cost. By eliminating the need for massive, single-use rocket boosters and the vast quantities of propellant they consume, Longshot aims to slash the price of reaching orbit. The company projects potential launch costs could be orders of magnitude lower than current rocket-based systems. Another major benefit is launch frequency. A ground-based system can theoretically be reloaded and fired multiple times a day, a cadence rockets can't match. This could be a game-changer for deploying large satellite constellations or resupplying future space stations. The system is also more environmentally friendly, as the initial launch phase uses compressed gas and electricity, producing zero combustion emissions.
The Hurdles on the Path to Space
While the physics is sound, the engineering challenges are immense. One major issue is the incredible G-forces created during acceleration. This technology is strictly for cargo; the system is not designed to launch humans. Payloads, like satellites and other hardware, must be specially designed or 'hardened' to withstand the intense forces, which are far greater than those experienced during a conventional rocket launch. Another challenge is scale. To reach orbital velocity, the launch tube would need to be enormous, potentially stretching for several kilometres. Longshot has already conducted over 100 test launches with a 120-foot prototype, achieving speeds over Mach 4. The company is now planning longer-range tests in Nevada and developing a hypersonic glide vehicle called 'Glowrider' to help bridge the gap to full orbital capability.
