The Pentagon's Approved Drone Fleet Runs on Chinese Motors. The FCC Just Banned Them.

A Silicon Valley fund has bet it found the person who can close the gap.

Westmag, a South San Francisco startup that designs and manufactures drone motors and robot actuators domestically, announced Tuesday it raised a seed round led by a16z's American Dynamism fund, with participation from Founders Fund, Lux Capital, Menlo Ventures, and NFDG. The firm did not disclose the amount. a16z's investors describe the search as exhaustive: they spent over a year looking for a company that could build American motors at scale before meeting cofounder David Hansen, whom the post calls an n-of-1 founder. Cofounder Jordan Sanders is the execution counterpart.

The timing of that search matters. In December 2025, the Federal Communications Commission updated its Covered List to ban future imports of foreign-made drones and critical components including motors from receiving equipment authorizations — the official public notice is here. The change followed a National Security Determination by an executive branch interagency body, and built on a FY2025 NDAA provision requiring the FCC to add DJI and Autel Robotics. Under the new rules, motors for drones manufactured outside the United States cannot receive FCC authorization for import or sale.

Months earlier, in November 2025, the Defense Department had identified that the majority of drones on its Blue UAS list — the platforms cleared for use by American military buyers — contained motors sourced from China. The list included systems the Pentagon had spent years validating as compliant with security requirements. Those same systems now face an unresolved compliance question: the FCC's action was forward-looking only, so existing authorized equipment can continue operating, but the supply pipeline for replacements is legally blocked. The FCC has not publicly specified active denial of equipment authorization applications under the new rules — whether enforcement is immediate or delayed is an open question that shapes how real the supply crisis actually is.

The manufacturing gap behind the problem is stark. China produces roughly 100 million small brushless drone motors per year, according to figures cited by former defense officials and industry executives. American producers collectively make an estimated 100,000. That is a gap of roughly three orders of magnitude, and it exists because motor manufacturing migrated overseas decades ago as costs fell.

Westmag has a factory in South San Francisco that is currently ramping production, according to its website. The company says it designs its own motors, performs automated winding and stator stamping in-house, and sources components through US and allied supply chains for NDAA compliance. No defense or robotics customer has publicly confirmed a partnership or letter of intent with Westmag — the customer pipeline is undisclosed.

What Westmag has not disclosed is how many motors it can currently produce, what it has committed to customers, or how its unit economics compare to Chinese alternatives. Those are the questions that will determine whether the company is a solution to a genuine crisis or a well-funded attempt at one. The cost gap is not abstract: a defense contractor or robotics firm calculating motor replacement today faces quotes from domestic producers that run several times Chinese equivalents at volume — if US manufacturing can close the gap at all, it is not there yet, and the gap closes slowly even in optimistic scenarios.

The a16z post frames the opportunity through the lens of two simultaneous buildouts: the drone revolution reshaping modern defense and the robotics revolution about to reshape everything else. Every drone needs four motors. Every humanoid robot needs dozens of actuators. If the FCC ban holds and enforcement accelerates, the addressable market for compliant American motors is whatever domestic producers can actually deliver.

For now, that is a small number. Westmag is trying to change that. The seed round gives them runway to try. Whether the manufacturing gap is closable at the speed US policy now requires is the question the company has not yet answered.