Instead of building its final passenger jet, Boom first developed a smaller, sub-scale prototype to prove its Mach 2.2 technology. This startup-like, sequential approach proves the core concept at a much lower cost, making the capital-intensive project more manageable and fundable.
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Before seeking major funding, Elysian validated its radical aircraft design with skeptical professors from TU Delft and MIT. Winning over these experts provided the critical credibility and third-party proof needed to build investor confidence in their unproven deep-tech concept.
Boom's founder describes Mojave's aerospace community as "hacking on airplanes" like software. This mindset involves resourceful, rapid, and iterative prototyping, challenging the slow, traditional processes in capital-intensive industries and enabling faster progress with less capital.
For projects requiring hundreds of millions, fundraising should be split into phases. The initial "pre-industrialization" phase, focused on proving technology, is suited for venture capital. Later phases for manufacturing and scaling should target project finance structures with debt/equity combinations and strategic partners.
While a fusion reactor can't be built in three months, YC pushes hardware and deep tech founders to create a tangible Minimum Viable Proof. This forces them to de-risk the venture by hitting a critical milestone, such as building a small-scale desert prototype or securing key letters of intent, proving traction on a non-obvious timeline.
Unlike software, where customer acquisition is the main risk, the primary diligence question for transformative hardware is technical feasibility. If a team can prove they can build the product (e.g., a cheaper missile system), the market demand is often a given, simplifying the investment thesis.
Contrary to popular belief, successful entrepreneurs are not reckless risk-takers. They are experts at systematically eliminating risk. They validate demand before building, structure deals to minimize capital outlay (e.g., leasing planes), and enter markets with weak competition. Their goal is to win with the least possible exposure.
Unlike software, hardware iteration is slow and costly. A better approach is to resist building immediately and instead spend the majority of time on deep problem discovery. This allows you to "one-shot" a much better first version, minimizing wasted cycles on flawed prototypes.
Boom Supersonic accelerates development by manufacturing its own parts. This shrinks the iteration cycle for a component like a turbine blade from 6-9 months (via an external supplier) to just 24 hours. This rapid feedback loop liberates engineers from "analysis paralysis" and allows them to move faster.
Boom Supersonic secured non-binding Letters of Intent (LOIs) from major airlines early. This demonstrated market demand was crucial for convincing suppliers and investors to commit the significant capital needed for development, turning customer interest into a financing tool.
Moving from a science-focused research phase to building physical technology demonstrators is critical. The sooner a deep tech company does this, the faster it uncovers new real-world challenges, creates tangible proof for investors and customers, and fosters a culture of building, not just researching.