The news
Nimbus Aerospace, a Seattle startup developing a hybrid-electric aircraft, has flown a quarter-scale prototype twice at the Pendleton Airport UAS Range in Oregon, a test area for uncrewed aircraft, GeekWire reported on September 28, 2026. The flights took place in June and August 2026.
The prototype, called NX1, has a 15-foot wingspan and weighs 200 pounds, according to GeekWire, and co-founder and CEO Adrian Groos told the outlet it cost more than $1 million to build. The first flight lasted 3 minutes and 42 seconds and the second lasted six minutes. GeekWire reported that the tests validated the startup's manufacturing, the aircraft's aerodynamics and its stability.
A remote pilot flew the aircraft. The team had planned to finish testing earlier in the summer but struggled to schedule one of the few pilots skilled in remote-controlled flight, GeekWire reported. "Not many people wanted to fly this thing," Groos told GeekWire.
Nimbus plans a hybrid-electric plane, which pairs a fuel-burning engine with electric motors, that carries six to eight passengers over a 1,500-mile range, GeekWire reported. The company's website describes the aircraft, the N1000, as seating six passengers plus two pilots, with a range of up to 1,500 nautical miles. The company says it is designing the aircraft to use half as much fuel as a comparable conventional plane. It is targeting full-scale prototype flights in 2028 and customer deliveries starting in late 2030, according to GeekWire; its website lists late 2030 as the target for type certification.
To shorten the path to Federal Aviation Administration (FAA) approval, Nimbus is using already-certified parts for components such as landing gear and lights, which GeekWire reported should also be cheaper and easier to fix. The company built an AI Certification Tool (ACT) Platform meant to speed up FAA certification, and a former FAA deputy director of aircraft certification sits on its advisory board.
The startup has five employees and has raised about $4 million from a single, unnamed family office, according to GeekWire. It is a former Techstars participant, plans to hire six engineers over the next year and has not decided where to build the full-scale aircraft.
The numbers
- NX1 wingspan
- 15 feet
- NX1 weight
- 200 pounds
- NX1 cost (per CEO Adrian Groos)
- More than $1 million
- Planned passenger capacity
- 6 to 8
- Planned range
- 1,500 miles (GeekWire); 1,500 nautical miles (Nimbus website)
- Funding raised (per GeekWire)
- About $4 million
Why CEOs should care
For charter operators, corporate flight departments and fleet planners, the pitch is lower operating cost: Nimbus says its design aims to use half the fuel of a comparable conventional plane, and Groos told GeekWire customers want aircraft that burn less fuel and need less maintenance. Those are design goals, not measured results. Deliveries are not targeted until late 2030, so treat any early commitments as options, and ask for independent performance data once a full-scale aircraft flies.
For aerospace suppliers, the approach is worth watching. Using pre-certified components such as landing gear and lights means new aircraft programs can create demand for parts that already hold approvals. Suppliers of certified components should track startups that design around existing parts, since they may become customers without the cost of a new certification effort.
For investors and boards, the numbers show how early this is. Nimbus has five people and about $4 million in funding, and it still has to build, fly and certify a full-scale passenger aircraft. GeekWire noted that Washington aviation startups Zunum Aero and Outbound Aerospace have ceased operations. Anyone evaluating the company should ask how it will fund the full-scale prototype and how its AI certification tool has been tested with regulators.
The bigger picture
Nimbus is one of several companies chasing hybrid-electric flight, alongside Heart Aerospace, Electra.aero and Ampaire, according to GeekWire. Groos told the outlet that hydrogen is not ready as an aviation fuel, citing limited supply and an uncharted certification path. Its schedule has already moved: in March 2025, ASME reported that Nimbus planned quarter-scale flight tests before the end of 2025 and was then aiming for certification and production in 2032, with a range of up to 1,100 miles. The changes are a reminder to treat startup timelines as targets, not commitments.
What’s next
The next milestones are hiring the six planned engineers, choosing a site to build the full-scale aircraft and raising the capital to do it. Watch for a larger funding round, any formal engagement with the FAA on certification, and whether the full-scale prototype flies on the 2028 target. For prospective buyers, independent data on fuel burn and maintenance costs will matter most.
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