INDEPENDENT TECHNICAL ANALYSIS · AAM / eVTOL / ELECTRIC FLIGHT

Engineering the Future of Electric Flight

Independent analysis of aircraft, propulsion, certification and the companies behind them.

RESEARCH TOOLS

Explore the aircraft and certification data

Browse aircraft, compare technical architectures, track certification progress and see how we source the data.

Propulsion, Engineered

Propulsion & Motor Engineering

How eVTOL programs choose between motor topologies, drivetrain layouts, and redundancy strategies — the engineering tradeoffs behind every propulsion decision, not just what's newest.

Architecture Comparisons

Distributed electric propulsion vs. tilt-rotor vs. lift-plus-cruise — side-by-side engineering comparisons of how different eVTOL programs solve the same problems differently.

Certification Pathways

How the FAA and EASA are building certification frameworks for powered-lift aircraft, and what actually separates a test flight from a type certificate.

Company & Program Tracking

Ongoing, source-by-source tracking of certification progress, funding, and partnerships across Joby, Archer, and the other leading eVTOL programs.

Battery Chemistry & Safety

What battery chemistry and specific-energy choices mean for range, payload, and thermal safety — and where energy density and safety margins trade off against each other.

Power Electronics

The inverters, motor controllers, and power-conversion systems that turn battery power into thrust — a less-discussed but equally real limit on eVTOL performance.

PROGRAM UPDATES

Recent certification and flight-test milestones

Company-reported

Vertical opens Valo Assembly Centre for certification-conforming aircraft

September 25, 2026

Vertical opened a 60,000 sq ft Valo Assembly Centre at Cotswold Airport on 25 September 2026. The site will assemble certification-conforming Valo aircraft, with the first build expected to start in Q4 2027, and retrofit a prototype for hybrid-electric flight testing in H1 2027. Vertical says early production capacity is more than 25 aircraft a year, and it plans to announce a separate full-scale production facility in Q4 2026. Type certification remains a company target for 2029.

Company-reported

Vertical Aerospace opens strategic review to fund Valo's next phase

September 24, 2026

Vertical began a review of strategic alternatives, including strategic and financial partnerships, to fund the next phase of the Valo programme, and retained Jefferies as financial adviser. No deadline was set and the review may not lead to a transaction. Vertical says flight testing, certification work and customer commitments continue unchanged.

Company-reported

Bye eFlyer 2 full-scale prototype completes first flight

September 24, 2026

Bye Aerospace flew the full-scale eFlyer 2 prototype for the first time on 24 September 2026 at Centennial Airport, Colorado, nine days after the FAA issued it an Experimental special airworthiness certificate. The flight opens the envelope-expansion test campaign; it is not a type-certification milestone.

Company-reported

Archer's acquisition of Wisk clears US antitrust (HSR) waiting period

September 18, 2026

The US Hart-Scott-Rodino waiting period for Archer's acquisition of Boeing's Wisk Aero, Insitu and SkyGrid expired on 18 September 2026. Other closing conditions and regulatory approvals remain; Archer expects to close by the end of 2026. Wisk Generation 6 remains in FAA type certification.

Company-reported

BETA begins eIPP operations with the ALIA CX300 in North Carolina and Texas

September 17, 2026

BETA began eVTOL Integration Pilot Program (eIPP) operations with its conventional-takeoff ALIA CX300 in North Carolina on 17 September 2026, flying more than 1,300 nm of simulated medical-supply missions under the state's eLIFT programme. Later in September it flew its first Texas eIPP mission with Metro Aviation and Washington County EMS under Project Nexus. These are pre-certification operational demonstrations, not FAA type certification.

Company-reported

BETA reports FAA acceptance of CX300 compliance requirements

August 12, 2026

BETA’s Q2 2026 update reported FAA acceptance of the CX300’s complete set of compliance requirements and closure of the Requirements Definition phase. This is a certification-program milestone, not Type Certificate issuance.

Latest

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Amprius Gets Up to $75M U.S. Award to Scale High-Energy Drone Battery Production
News

Amprius Gets Up to $75M U.S. Award to Scale High-Energy Drone Battery Production

Amprius has secured a U.S. government award worth up to $75 million to convert an existing domestic EV-battery line for high-energy-density silicon-anode cells targeting Group 1–3 UAS, with production capacity targeted at 12 million cells per year.

2 min
BETA Starts eIPP Medical-Logistics Flights in North Carolina and Texas With Its Runway Electric Aircraft
News

BETA Starts eIPP Medical-Logistics Flights in North Carolina and Texas With Its Runway Electric Aircraft

BETA's conventional-takeoff ALIA CX300 began eIPP medical-logistics flights in North Carolina on 17 September 2026, covering more than 1,300 nm, and flew its first Texas eIPP mission for Washington County EMS on 24 September. The trials test where a runway electric aircraft fits in healthcare aviation, and how much charging infrastructure it needs.

4 min
SkyDrive Explains Why the SD-05 Uses 12 Rotors: Disk Loading, Power Margin and the Motor-Out Case
News

SkyDrive Explains Why the SD-05 Uses 12 Rotors: Disk Loading, Power Margin and the Motor-Out Case

SkyDrive has published its engineering case for a 12-rotor, wingless SD-05: low disk loading to cut hover power, and enough rotors and battery packs that losing one still leaves margin for a vertical landing. We run the numbers and set out what the layout gives up.

4 min
Elroy Air Upsizes PIPE to $175 Million, Adds Lockheed Martin Ventures Ahead of Nasdaq Listing
News

Elroy Air Upsizes PIPE to $175 Million, Adds Lockheed Martin Ventures Ahead of Nasdaq Listing

Elroy Air has increased the PIPE behind its SPAC merger to $175 million, with $75 million already funded and Lockheed Martin Ventures joining. The money goes into Kratos-built production of Chaparral, an uncrewed hybrid-electric VTOL cargo aircraft, with the first production aircraft targeted for late 2026.

4 min
Lightning Protection for Electric Aircraft: Composite Structure, HV Batteries and Distributed Propulsion
Systems

Lightning Protection for Electric Aircraft: Composite Structure, HV Batteries and Distributed Propulsion

Carbon-fibre airframes, floating high-voltage batteries and many boom-mounted motors make lightning an architecture problem for eVTOL and electric aircraft. This explainer covers zoning, direct and indirect effects, rotor and bearing current paths, HV-bus transients and why a strike is a common-cause event for distributed propulsion.

6 min
Archer's Deal for Boeing's Wisk, Insitu and SkyGrid Clears US Antitrust Waiting Period
News

Archer's Deal for Boeing's Wisk, Insitu and SkyGrid Clears US Antitrust Waiting Period

The US Hart-Scott-Rodino waiting period for Archer's acquisition of Boeing's Wisk Aero, Insitu and SkyGrid expired on 18 September 2026. Other regulatory approvals are still pending, and Archer expects to close by the end of 2026, leaving it with two very different eVTOL certification programmes.

2 min
Bye eFlyer 2 Makes First Flight, Opening Its Electric-Trainer Test Campaign
News

Bye eFlyer 2 Makes First Flight, Opening Its Electric-Trainer Test Campaign

Bye Aerospace's full-scale eFlyer 2 prototype flew for the first time on 24 September 2026 at Centennial Airport near Denver. The flight starts envelope expansion for a two-seat electric trainer pursuing FAA Part 23 certification, but type certification remains a separate and much longer step.

2 min
Vertical Aerospace Opens Strategic Review as Valo Heads for Critical Design Review
News

Vertical Aerospace Opens Strategic Review as Valo Heads for Critical Design Review

Vertical Aerospace has started a review of strategic alternatives, including strategic and financial partnerships, with Jefferies as adviser. The move comes after piloted Valo transition flights and ahead of a Critical Design Review due by the end of 2026, with Type Certification now targeted for 2029.

5 min
eVTOL Battery Thermal Runaway: Cell Propagation and Containment
Systems

eVTOL Battery Thermal Runaway: Cell Propagation and Containment

A failed lithium-ion cell can heat neighbouring cells, vent flammable gases and threaten essential aircraft systems. This explainer examines propagation barriers, designed venting, DO-311A and EASA's propulsion-battery test approach, with the limits of early detection and certification evidence.

5 min
Multicopter, Lift + Cruise and Vectored Thrust: eVTOL Architecture Trade-offs
Systems

Multicopter, Lift + Cruise and Vectored Thrust: eVTOL Architecture Trade-offs

Multicopter, lift + cruise and vectored-thrust aircraft allocate hover and cruise propulsion differently. Compare their disk-loading, wing-lift, installed-mass, transition and failure-analysis trade-offs without treating manufacturer targets as like-for-like results.

5 min
Heart Replaces ES-30 With Two-Propeller, 36-Seat ES-36 Hybrid-Electric Airliner
News

Heart Replaces ES-30 With Two-Propeller, 36-Seat ES-36 Hybrid-Electric Airliner

Heart Aerospace has unveiled the 36-seat ES-36 with two series-hybrid powertrains, each pairing a 1.65 MW electric motor with a turbogenerator. Heart quotes 200 km all-electric and 1,200 km hybrid range; JSX has a deposit-backed agreement for 50 aircraft plus 50 purchase rights.

5 min
EU Funds Rival Hybrid-Electric Engine Demonstrators From Rolls-Royce and MTU
News

EU Funds Rival Hybrid-Electric Engine Demonstrators From Rolls-Royce and MTU

Clean Aviation's fourth call has selected 19 projects with €290 million of EU funding. Two of them, led by Rolls-Royce Deutschland and MTU Aero Engines, will ground-test hybrid-electric propulsion for a next-generation short- and medium-range airliner, while three others target cryo-cooled power electronics, superconducting windings and fuel-cell propulsion hardware.

5 min
Electra Flies EL2 From an Airport Heliport on Helicopter-Style Instrument Procedures
News

Electra Flies EL2 From an Airport Heliport on Helicopter-Style Instrument Procedures

Electra has flown its hybrid-electric EL2 demonstrator from a heliport on the Roanoke–Blacksburg Regional Airport ramp and from other vertical-flight landing areas in Virginia, using point-in-space instrument procedures under the FAA's eIPP. The campaign tests whether a blown-lift airplane can use landing sites and IFR routings built around helicopters.

5 min