How I Invest with David Weisburd
Hosted by David Weisburd
Written by a model from the transcript; not yet reviewed.
This episode covers the founding, strategy, and scaling of Castellian, a defense manufacturing company focused on producing affordable hypersonic weapons at scale. The guest explains how lessons from SpaceX, including first-principles thinking and eliminating unnecessary process complexity, guided their approach to modern defense systems. They discuss the critical challenges of building the defense-industrial base, navigating hardware development in an industry dominated by risk aversion, and selecting New Mexico for Project Ranger, a thousand-acre hypersonic manufacturing facility.
The episode opens with the announcement of Castellian’s billion‑dollar Series C led by major investors.
Castellian’s goal to accelerate development, reduce cost, and scale defense systems.
Emphasis on engaging customers to shape product requirements and avoid over‑engineering.
Debate over whether Castellian should vertically integrate or rely on external suppliers.
Explanation of Musk’s approach to eliminate unnecessary features to streamline production.
Discussion of hiring practices, cultural fit, and the importance of recruiting talent.
Castellian’s origin story, early rejections, and the pivotal first investor.
The conversation shifts to the importance of having capital and the increased focus on execution risk as the company moves forward.
The speaker explains the strategic reasoning behind developing the Blackbeard missile to meet future defense needs.
Exploration of how the Navy and Army became early customers and the challenges of adapting the weapon for different launch platforms.
The team’s effort to maintain weapon commonality across air and ground launch systems to reduce cost and increase scalability is highlighted.
The host shares his personal history and expresses deep respect for the company’s mission, closing the interview on a personal note.
Manufacturing capacity vs adversariesinsight
The guest explains that competing against capable manufacturing adversaries like China requires massive production capacity because a country cannot win a war if it runs out of weapons.
Vertical integration out of necessitystrategy
The guest explains that they only vertically integrate when suppliers are too slow or expensive, noting that traditional aerospace development is hindered by excessively slow timelines and high costs.
Data-driven engineering cultureinsight
The guest shares that at SpaceX, engineers were required to bring quantitative data rather than hunches to design reviews, which eliminated endless worrying about hypothetical problems.
The responsible engineer modelstrategy
The guest describes the SpaceX model where individuals act as CEOs of their specific components, owning the requirements, engineering, cost, and manufacturing from end to end.
Capitalizing a defense hardware startupstory
The guest reflects on facing nearly a hundred venture capital rejections when starting Castellian in 2022, when defense hardware was widely considered uninvestable.
Choosing locations for manufacturingstory
The guest details how Castellian selected Rio Rancho, New Mexico for Project Ranger, a thousand-acre facility designed to produce up to two thousand Blackbeard weapons per shift.
“There's a ton of work that goes into a successful fundraise, which this one's actually the first one that's been led by our CFO, Andrew Greitz.”
“The only way that the government can afford thousands, tens of thousands, hundreds of thousands, whatever the number is necessary, is that the price of whatever it is has to be, times that quantity, has to be affordable.”
“I personally 100% subscribe to that theory.”
“We can be a large part in helping to address the time to develop these systems, the cost of them, and the scale.”
“I would actually say, I don't want to vertically integrate anything.”
“And if you can't find it in commercial because it just doesn't exist, then you have to vertically integrate, usually through great pain.”
“And if you can solve that, you're absolutely in a very strong competitive position with like the traditional primes.”
“Our rationale for why we developed Blackbeard was looking at what are the capabilities that you would need in a weapon system to deter a conflict in the 2027 and beyond timeframe?”
“Well, Brian, I was born in a communist country in Russia.”
David sits down with Bryon Hargis, co-founder of Castelion, to unpack why rebuilding America’s defense manufacturing capacity has become a national security imperative. Bryon explains why decades of consolidation and outsourcing weakened the defense industrial base, why America could struggle against an adversary with significantly greater manufacturing capacity, and why Castelion is betting that deterrence ultimately requires weapons that can be produced affordably by the thousands.
9,598 words · 2 speakers
Speaker names marked are inferred from speaking time and the show’s known hosts — they are not voice-verified.
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