Inside The Startup Building Reusable Rockets...

Stoke Space is pioneering fully and rapidly reusable rockets, aiming to achieve aircraft-like reusability for the entire rocket system. Existing technology primarily allows for the reuse of only the first stage, which has increased launches to approximately 150 per year. Stoke's focus on full reusability, including the second stage, represents a significant leap, potentially making space access dramatically more affordable and frequent. This approach aims to open new verticals and applications in space, similar to the impact of the iPhone app store.

The Nova rocket features a two-stage-to-orbit design. Its first stage boasts one of the highest-performing rocket engines in terms of fuel efficiency. This efficiency is critical for achieving long life and rapid reusability. The second stage, named Andromeda, is designed to complete the journey to orbit and crucially, survive re-entry to Earth, a challenge current systems overcome by discarding the second stage after each mission.

The Andromeda capsule, Stoke's second stage, is engineered to endure speeds of 17,000 mph and temperatures exceeding 2700°F during re-entry from orbit. Its survival relies on a sophisticated custom heat shield. This shield utilizes cold liquid hydrogen to flow through an integrated heat exchanger, absorbing the extreme thermal energy generated by atmospheric friction.

Following re-entry, 24 small thrusters activate to precisely control the capsule's deceleration and ensure an accurate landing angle. This allows for the recovery and rapid reuse of what traditionally are multi-million dollar components that are discarded after a single use. The ability to reuse the second stage is a transformative step towards making space flight economically viable for a wider range of applications.

Founders Andy and Tom, former jet propulsion engineers at Blue Origin, established Stoke Space in 2019. Their motivation stemmed from identifying the critical unmet need for full rocket reusability, despite the existence of over 150 other rocket companies. They observed a lack of rigorous effort devoted to solving this specific problem, coupled with their own innovative ideas on how to address it.

The decision to leave comfortable jobs and start Stoke Space, particularly with young children, was described as a "wildly irresponsible" and difficult choice. They initially set a six-month deadline to achieve legitimate traction. The company's first check arrived just before this deadline, providing critical momentum. Their key insight was that focusing on reusability from day one would decrease cost and increase availability and reliability of space access.

Early development involved building a prototype engine and testing it in a shipping container in Tom's backyard. This hands-on approach allowed them to demonstrate hardware functionality to early investors with minimal capital. The initial setup included a test cell, storage, and a rudimentary but functional test stand for gaseous hydrogen and liquid oxygen thruster tests.

Fundraising proved to be a significant challenge, especially with the onset of the COVID-19 pandemic. The founders had no established network or "rich uncles," and the venture capital market at the time was heavily geared towards SaaS companies, not hardware. Participation in Y Combinator (YC) was pivotal, helping them navigate the fundraising process and build momentum. A key piece of advice for fundraising was to "get good at hearing no," maintaining conviction despite repeated rejections. Stoke Space has since raised approximately $90 million.

Stoke Space operates a 168,000 sq ft factory in Kent, Washington, where they build every part of their rockets in-house, from avionics and electronics to engine assembly and structural components. This vertical integration includes additive manufacturing and structures fabrication. The facility is designed to produce about seven vehicles per year, reflecting a commitment to scaling manufacturing capabilities.

Maintaining a balance between execution speed and the patience required for deep technical work is crucial. The company emphasizes rapid iteration, where lessons from failures are quickly incorporated. For instance, if an engine fails, a new one must be ready on the factory floor almost immediately. By producing parts internally, iteration cycles for design changes and testing can be reduced from a month to a day or two, accelerating developmental timelines and reducing overall costs.

Software is integral to Stoke Space's operations, extending beyond rocket control to managing the entire company from a garage-level startup to a regulated entity for government and human payloads. The company developed its own internal tool called BoltLine to manage operations, acknowledging that traditional enterprise solutions couldn't address the unique demands of frequent rocket reuse, such as tracking part service life, preventative maintenance, and unscheduled repairs.

In addition to the factory, Stoke is building a launch site at Cape Canaveral's historic Complex 14. Development milestones include structural qualification, engine testing, and hardware-in-the-loop testing for avionics and GNC software, running simulated missions to prove system robustness. The ultimate goal is daily flight operations, aiming for a future where space access is as commonplace and reliable as commercial air travel, fundamentally transforming the space economy.