World's Largest Electric Aircraft: How Heart Aerospace Built It

Key Insights

• Heart Aerospace's electric aircraft has a 100-foot wingspan, weighs 25,000 pounds, and costs just $5 in electricity per flight
• The ES-30 successor will fly 125 miles on battery alone and up to 500 miles as a hybrid, with 30-minute recharge times
• It's the first clean-sheet airliner built in the US in 18 years across any category
• Electric motors have only one moving part versus thousands in jet engines, making them cheaper to produce and virtually wear-free
• Half of all flights worldwide are under two hours — a massive market currently underserved by 40-year-old aircraft designs

The Electric Motor Advantage

Electric motors fundamentally change aircraft efficiency. Heart's motors weigh only grams on drones and scale up to 400-kilowatt versions — maintaining the same simple architecture. Unlike jet engines, which have thousands of parts and burn fuel hot enough to melt metal, electric motors have essentially one moving part, no combustion, and virtually no wear.

The cost difference is dramatic. A jet engine costs the same whether it powers a 30-seat or 70-seat plane, pushing the industry toward larger aircraft on longer routes. Electric motors enable smaller, regional planes to be profitable — finally serving the market that jet engines left behind.

Why Regional Aviation Was Broken

Jet engines are catastrophically inefficient for short flights. On regional routes, aircraft can spend 10% of fuel just taxiing to the runway. Takeoff and landing are equally wasteful. Meanwhile, 40-year-old turboprop designs dominate this market segment, even though half of all global flights are under two hours.

Heart's electric aircraft solve this problem. With eight battery packs (equivalent to four Tesla batteries carrying $40 worth of fuel), the plane can operate silently and efficiently on routes where jet engines burn through fuel without generating revenue. Island hopping in Hawaii or connecting remote fjord towns becomes economically viable.

From 3D-Printed Model to 100-Foot Wingspan

CEO Anders Forslund walked into Y Combinator seven years ago with a 3D-printed plane model small enough to hold in his hand. The journey from prototype to test flights reveals how hardware startups scale through material proof points.

At MIT, Forslund encountered Elon Musk discussing electric transportation and 400 watt-hour per kilogram batteries. That conversation became the catalyst. While researching jet engines by day, Forslund tinkered with drones at his kitchen table by night. He built relationships with Nordic airlines before even founding Heart Aerospace.

Each funding milestone required something tangible: LOIs from SAS, Braathens, and Widerøe; then a 400-kilowatt motor prototype that caught United Airlines' attention through — remarkably — a spam folder email. That physical motor made the vision real enough to attract capital and customers.

The Battery Challenge and Hybrid Solution

The hardest technical problem wasn't the motor or wing design — it was safety reserves. Aircraft must carry enough battery for 45-minute diversions to alternate airports, potentially 100 miles away. For pure electric aircraft, this means carrying two-thirds of battery capacity as reserves. Unlike jet fuel, batteries don't get lighter as they discharge.

Heart's solution: hybrid engines. A simple, inexpensive turboprop engine adds 20% to upfront costs but enables flights up to 500 miles and provides crucial safety margins. The plane can fly 125 miles purely electric, then switch to hybrid for longer routes. This pragmatic approach contrasts with traditional aerospace philosophy, which minimizes catastrophic failure probability by waiting until everything is perfectly understood.

Building Software-Defined Airplanes

Modern aircraft rarely crash from structural failure. Instead, accidents stem from faulty logic and system failures — making software architecture critical. Heart is building "computers on wings," where every system from ailerons to landing gear uses the same modular architecture.

The pilot plant in LA is wired as one giant test bench, testing fault injection scenarios from programming errors to cut wires. The goal: everything must work even when everything goes wrong. This software-first approach enables rapid iteration impossible in traditional aerospace, where single components take a year to source from suppliers.

Why 36-Passenger Seats, Not Flying Taxis

Heart targets the mainstream airline market, not the helicopter market. Thirty-six-seat capacity leverages 5,000 existing US airports — infrastructure that flying taxi startups ignore. The planes are designed to replace 40-year-old aircraft that have become appreciating assets, making the economic case straightforward.

Long-term ambitions extend to narrow-body markets (Boeing 737 and Airbus A320 replacements), where ridiculous production backlogs exist. This positions Heart similarly to how SpaceX revolutionized rockets — by rethinking a stagnant industry.

The Future: Quieter Skies and Remote Pilots

Electric aircraft produce dramatically less noise and vibration than turboprops. This unlocks local airport usage that jet noise eliminated decades ago, enabling cheaper tickets and more convenient travel.

Future aircraft will support remote pilots managing multiple planes simultaneously — similar to Waymo's autonomous vehicle fleet operations. Autonomy will eventually extend from cargo applications into passenger flights, where the stakes are lowest before full autonomy arrives.

Conclusion

Heart Aerospace has built the world's largest electric aircraft by demonstrating that electric motors, combined with hybrid power and software-defined architecture, can finally serve the regional aviation market that jet engines abandoned. From a 3D-printed model to a 100-foot wingspan flying down LA runways, the company proves that sometimes the most revolutionary technology simply requires choosing a different power source. The dream of cheaper, quieter, and more efficient regional flights — connecting island communities and remote towns — is no longer a fantasy. It's taxiing.

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Original source: The World’s Largest Electric Aircraft Just Flew

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