Lilium and the thirty-six electric jet engines that went bankrupt and came back from the dead

Lilium, the German eVTOL startup that burned through roughly $4 billion, declared insolvency in October 2024, and laid off nearly 1,000 engineers, is back. Acquired out of bankruptcy in early 2025 by a consortium led by Mobile Uplift Corporation, the company has resumed operations with a leaner team, the same radical airframe, and a new ownership group willing to fund the long road to certification. The core question remains unchanged: can 36 small ducted electric fan engines embedded in a fixed wing deliver on the promise of fast, quiet, efficient regional air travel?

What Makes Lilium’s Design So Different From Other eVTOLs?

While competitors like Joby, Archer, and Wisk build multirotors or tilt-rotor configurations that resemble oversized drones, Lilium took a fundamentally different approach. Founded in 2015 near Munich, the company designed a fixed-wing aircraft with 36 small ducted electric jet engines embedded in the trailing edges of its canard forewing and main wing. These are not propellers or tilt-rotors — they are ducted fans small enough to hold in your hands, arranged along flaps that rotate from vertical for takeoff to horizontal for cruise.

This architecture is called distributed electric propulsion, and the physics behind it are genuinely compelling. Spreading thrust across dozens of small fans embedded in the wing structure delivers three advantages simultaneously: redundancy (lose five engines and you still have plenty of thrust), a cleaner aerodynamic profile in cruise (ducted fans can be partially closed off when vertical lift is unnecessary), and what Lilium has always called the key advantage — significantly better cruise efficiency than any multirotor design.

Why Does a Fixed Wing Matter for Electric Flight?

A helicopter or multirotor eVTOL spends enormous energy hovering. The disc loading — thrust per unit area of the rotor disc — is high, meaning you are pushing a lot of air very fast through a small area, which is inherently inefficient. Lilium’s approach accepts that penalty during the brief hover phase of takeoff and landing, roughly 60 to 90 seconds, then transitions to wing-borne flight where the fixed wing generates lift efficiently.

The performance numbers reflect this tradeoff. In cruise, the Lilium Jet is designed to fly at approximately 170 knots — dramatically faster than any multirotor eVTOL in development. Projected range exceeds 100 miles with reserves. Compare that to Joby, Archer, and Wisk, whose tilt-rotor or multirotor configurations cruise at roughly 100 to 130 knots with ranges between 60 and 100 miles. Once the Lilium Jet reaches cruise, it is essentially a small regional airplane, not a drone trying to go fast.

What Caused Lilium’s Bankruptcy?

The technology did not fail. The business model ran out of runway before the airplane could prove itself.

Lilium went public through a SPAC in 2021, raising approximately $580 million. But the company was attempting something extraordinarily hard and expensive simultaneously — developing an entirely new propulsion system from scratch. Those 36 ducted electric fan engines are not off-the-shelf components. Each one required custom motor design, custom power electronics, and custom thermal management, all coordinated through a flight control system managing 36 independent thrust sources. The software challenge alone is immense.

Development costs were relentless. Certification took longer than projected. Revenue remained years away. By late 2024, the money was gone.

What most people miss: Lilium had completed over 700 test flights with its fifth-generation demonstrator before insolvency. The transition from hover to cruise flight — the hardest part of any eVTOL program — had been demonstrated repeatedly. EASA had been working with Lilium on certification for years. The engineering was progressing. The checkbook was not.

How Did Lilium Come Back From the Dead?

In early 2025, a consortium led by Mobile Uplift Corporation, backed by investors from the Middle East and Europe, acquired Lilium’s assets out of insolvency. The acquisition included not just patents and intellectual property but the factory, tooling, and — critically — the consortium began rehiring engineers. By mid-2025, Lilium was operational again with new ownership signaling willingness to fund the path to certification.

The new Lilium has discussed targeting type certification in the 2027 to 2028 timeframe, though eVTOL timeline delays are the norm rather than the exception.

What Challenges Still Stand in the Way?

Battery energy density remains the fundamental constraint. Lilium’s design requires batteries that deliver enough energy for a meaningful mission while staying light enough for useful payload capacity. Current lithium-ion cells can handle short regional hops, but the margins are thin — every kilogram of battery displaces a kilogram of passenger or cargo. Lilium has been working with custom silicon anode battery cells promising higher energy density, but those cells still need aviation certification.

Regulatory rebuilding is another hurdle. Insolvency is not a pause button. Relationships with regulators must be rebuilt, test data revalidated, and institutional knowledge reconstructed after significant engineering staff turnover.

Market economics must also close. Lilium’s seven-seat configuration targets regional air mobility — 50 to 100 mile hops between city pairs that don’t justify a full regional jet. Think the French Riviera, Greek islands, and connections between midsized European cities. Operating costs per seat mile must undercut conventional alternatives, which depends on electricity prices, battery replacement cycles, maintenance costs, and utilization rates that remain theoretical.

How Does Lilium Compare to Joby, Archer, and EHang?

Joby Aviation is generally considered furthest along in the United States, with FAA type certification potentially arriving in 2026. Archer is close behind. Both build tilt-rotor designs targeting urban air mobility. In China, EHang has already received a type certificate for its two-seat autonomous air taxi and is operating commercially in limited scenarios.

Lilium occupies a different niche entirely. Rather than competing with Joby for five-mile urban hops, Lilium would compete with carriers like Cape Air and Silver Airways on hundred-mile regional routes. That is a bigger market with higher revenue per flight, but it demands a more capable vehicle — exactly what 36 electric jet engines on a fixed wing are designed to deliver.

Why the Noise Advantage Matters

Ducted fans are inherently quieter than open rotors of equivalent thrust because the duct contains and redirects sound energy. Lilium has published noise data suggesting the aircraft at cruise altitude would be barely perceptible from the ground. Every eVTOL company must win the noise battle before winning the market, and Lilium’s architecture provides a structural advantage. Community acceptance will be a gating factor for the entire industry.

The Flight Control Engineering Behind 36 Engines

Managing 36 independent electric motors, each with its own power electronics, through a fly-by-wire system that handles the transition from vertical to horizontal flight is a controls problem of extraordinary complexity. The upside is extraordinary redundancy — multiple engines can fail on one side and the system redistributes thrust across remaining motors. There is no single point of failure resulting in loss of control. That matters not just for safety but for convincing certification authorities to approve a vehicle with no autorotation capability and no ballistic parachute in its baseline design.

Key Takeaways

• Lilium’s 36-engine distributed electric propulsion design offers a fundamentally different approach to eVTOL — fixed-wing cruise at 170 knots with 100+ mile range, far exceeding multirotor competitors.
• The technology was never the problem. Over 700 test flights validated the hover-to-cruise transition before the company’s October 2024 insolvency.
• New ownership under Mobile Uplift Corporation acquired the assets, factory, and tooling in early 2025 and is rehiring engineers with a target certification window of 2027–2028.
• Battery energy density and certification timelines remain the steepest challenges, along with proving that per-seat-mile economics can beat conventional regional carriers.
• Engineers who have examined the architecture closely consistently say the physics and aerodynamics work — the question has always been execution and funding, not feasibility.