Why We Invested in Pluto Aerospace: The scarcest resource in hypersonics is a test flight

Chris Nilsen likes to say “it’s cheaper to put a satellite into orbit than to test a thermocouple on a rocket here on Earth.” His company, West Lafayette-based Pluto Aerospace, was built to change that. Pluto recently raised $2.5 million in a round led by FUSE, and Elevate Ventures invested alongside them.

Pluto’s DASH rocket is designed to carry experiments to about Mach 5 and bring them back for inspection. Flights start at $50,000, with lead times of 60 to 90 days. We think cheap, frequent flight testing is one of the biggest gaps in American hypersonics, and Pluto is the most practical answer to it we have seen.

Why flight tests are rare

Hypersonic means Mach 5 and up, roughly a mile per second. At that speed, the air around a vehicle gets hot enough to change how materials, sensors, and electronics behave. Ground

facilities can recreate the speed or the heat, but no single facility recreates the whole environment at once. The data engineers trust most comes from live flights.

Flights are hard to get. Range capacity is limited, slots go to big programs, and hardware often waits months or years for a chance to fly. A single suborbital test can cost $2 to $5 million. So most teams design from simulations and ground tests. They then fly near the end of a program, because at that point, every surprise is expensive.

The people who feel this scarcity the most have small, specific questions: a startup engineer testing a new heat shield material or a university lab validating a sensor. Neither needs a full-scale vehicle. They need one flight, a look at the hardware, a fix and another flight. Today, they wait for a ride on someone else’s program.

Why now

Hypersonics became a national priority, and the U.S. fell behind on testing. In 2021, Gen. John Hyten, then vice chairman of the Joint Chiefs of Staff, said the U.S. had run nine hypersonic tests in five years while China had run “hundreds.” His prescription was simple: test, fail, learn and fly again.

The Pentagon is now paying for that approach. In 2022, it created MACH-TB, a hypersonic test-bed program co-led by the Naval Surface Warfare Center Crane in southern Indiana, because programs rarely got to fly components before a full system test. In January 2025, it awarded Kratos a contract worth up to $1.45 billion to increase the number of test flights.

Rocket motors are a bottleneck too. In February, Kratos and Rafael broke ground on a solid rocket motor campus in Bloomfield, Indiana, citing a growing gap in U.S. production. Pluto is built for both problems: more flights and more motors.

Why the big players leave a gap

The established names in hypersonic testing are good at what they do, and what they do is big. Stratolaunch air-launches its reusable Talon-A vehicle from the world’s largest airplane by wingspan. Kratos is the prime integrator for MACH-TB. These flights carry a lot of hardware and cost millions of dollars: the right tool for a maturing program, the wrong one for a team that wants to try a new coating next month.

A business built around multi-year defense programs can’t profitably sell a $50,000 flight on a 60-day turnaround, and has little reason to try. Pluto is built for that business from the motor up.

What Pluto sells, and the bet behind it

Pluto sells a standardized flight. DASH carries a customer’s experiment through high-speed, high-heat conditions and returns the hardware for inspection. Engineers fly, study the data, change the design, and book the next flight. In Chris’s words, that cycle “should take months, not years or entire careers.”

Cheap rockets require cheap motors. To make frequent, affordable flight testing possible, Pluto designs and builds its own solid rocket motors and makes its own propellant. In solving that problem for its own rockets, the company has opened a complementary market of supplying affordable motors to other vehicle builders facing the same cost and availability constraints. Specifically, this applies to verticals that require less performance demand like C-UAS and sled tracks that are often chained to the unnecessary cost structures of high-performance missiles.  The manufacturing capability that makes DASH economical is also a product that other customers need.

This is where Pluto is contrarian, and we think they’re right. Sounding rockets are old, unglamorous technology and in Chris’s view, most new rocket companies are optimizing for one government customer and one big production contract. Pluto is betting that the unglamorous rocket is the real bottleneck: hypersonics, space science, microgravity research, and target vehicles look like separate markets but each needs an affordable ride to a specific flight environment and each program tends to build its own. Chris compares it to AWS, which didn’t invent the server but made servers something anyone could rent on demand. Pluto’s first customers, who span defense, materials and university research, suggest the market agrees.

Why we backed Chris

Chris has been around rocket test stands since he was a student. At Purdue, he ran a liquid rocket project for the student space program, then worked his way from test assistant to engineer at Zucrow Labs. He has consulted on solid-rocket motor testing for Estes Industries, the model rocket company that got a lot of engineers started and has supported hundreds of rocket flights. That is the founder/market fit we look for. He has spent nearly a decade getting hardware tested and flown.

Chris has strong advisors in Steve Heister, a Purdue Distinguished Professor and leading propulsion researcher, and Mark Grubelich, a 40-year Sandia National Laboratories veteran and Distinguished Technical Fellow. This round adds the engineering and production team to go with them.

What Pluto has done so far

Pluto got here on very little outside capital. It is already flying experiments for paying customers and this round will help it fly more often. They are also preparing to deliver their first motors to be integrated into their customer systems. 

That is rare for a seed-stage hardware company. Most are still working from letters of intent and test-stand data. Pluto has hardware coming back from flight and customers who paid to put it there.

The opportunity and our thesis

We think about this market bottom-up: the number of programs that need flight data multiplied by the flights each one buys. Pluto changes the second number. The budget for one $2 million test buys 40 DASH flights at Pluto’s starting price. Those won’t replace the big test, but they move flight data to the front of a program where it’s cheapest to act on.

Pluto is starting at the bottom of the market on purpose with urgent, early-stage experiments. From there, the path runs to repeat programs, motor sales, and large government test contracts like MACH-TB. If Pluto wins, booking a hypersonic flight becomes as routine as renting a server and Pluto owns the rockets and motors underneath.

Our thesis: the U.S. has to test hypersonic hardware far more often and whoever makes testing cheap and routine will set the pace for everyone else. Pluto has the lowest-cost flight we’ve found, the in-house motors that make that price possible and a founder who has spent his career on test stands. Indiana has a real propulsion cluster that stretches from Purdue’s labs to NSWC Crane and the new motor campus in Bloomfield. Pluto is the kind of homegrown company that cluster needs and backing companies like it early is our job.

Who’s backing Pluto

FUSE led the round and we’re glad to invest alongside them. We also thank the investors who backed Chris early, including founding investor Paul Stahura, the Purdue Research Foundation and ThirdRail Ventures.

If you’re building hardware that needs to fly fast, Pluto wants to hear from you at hello@plutoaerospace.com. If you’re building a hard tech company in Indiana, we’d love to hear from you.