Analex Laboratories' "PERCH" System Cuts eVTOL End-of-Life Payload Loss to 8% and Doubles Vertiport Throughput

Analex Laboratories announced today that its Project PERCH programme has completed an 11-month operational trial demonstrating that the two problems actually gating the urban air mobility business case — battery degradation and vertiport throughput — are the same problem, and can be attacked together. In a 2,140-cycle accelerated campaign on representative eVTOL packs, PERCH's prognostics-driven charging scheduler held end-of-life capacity loss to 8.1%, against 27.4% for a conventional 30-minute fast-charge regime on identical cells. Because an eVTOL's available payload is set by its worst-case state of health, that gap is not a maintenance statistic: it is the difference between an aircraft that flies a full complement at the end of its life and one that quietly degrades to a single passenger. In parallel, PERCH's pad-scheduling and precision-approach automation cut pad occupancy time from 104 seconds to 55 seconds and sustained 42 movements per hour across a four-pad vertiport in simulation with live aircraft-in-the-loop, with noise-aware departure routing holding the 65 dB Lmax contour inside the vertiport fence.

The system works by refusing to treat the aircraft and the ground as separate. On the aircraft side, electrochemical impedance spectroscopy taken during every turnaround feeds a state-of-health and state-of-charge model that knows not just how much energy a pack holds but how much charge current each cell region can accept right now, given its measured temperature gradient — so PERCH charges each pack on its own profile rather than to a fixed timer. That turns a schedule constraint into a physical one. On the ground side, the same model tells the vertiport which aircraft will be ready when, so approach sequencing is planned against genuine energy and thermal state rather than optimistic assumptions; a 1.2 MW charging installation with local buffer storage absorbs the peak so the vertiport does not force a substation upgrade. Departure corridors are chosen for community noise rather than for ATC convenience, with the routing engine trading a few seconds of flight time for a materially smaller noise footprint. "Everyone in this industry has spent a decade arguing about battery energy density, and they are right that chemistry is the long pole," said Dr. Ananya Patel, Chief Director of Aerospace Technology & Engineering at Analex Laboratories. "But you cannot wait for solid state to fix a business case that has to work with 260 watt-hours per kilogram. The payload an operator loses in year three is not caused by chemistry — it is caused by how they charged the pack in year one. We are not making the battery better. We are stopping operators from making it worse, and then using the recovered margin to fly more movements per pad per hour. Those two numbers are the same number."

Analex was deliberately unflattering about the boundaries. PERCH does not change cell chemistry, and it does not beat the thermodynamic wall: a pack charged aggressively enough to hit a 12-minute turnaround will still lose more capacity than one charged gently, and the system's job is to price that trade rather than abolish it. The trial also exposed a failure mode the team had not predicted — impedance signatures from packs flown in high-humidity coastal operations drifted enough to fool the prognostic model into over-conservative charging, costing 3% throughput until the model was retrained on humid-baseline data. And the vertiport automation assumes a level of ground-crew training that Analex concedes does not exist at most candidate sites today; the company has released a 40-hour curriculum alongside the data. Thermal runaway detection and containment logic, developed with reference to the EASA SC-VTOL framework, uses a two-stage gas and impedance trigger, and Analex says it will publish the full trigger-threshold dataset rather than keep it proprietary.

The timing is aimed squarely at a market that has just started to move. The FAA's eVTOL Integration Pilot Program selected eight projects across 26 states in March and began operations within 90 days — including BETA's first cargo missions in July — giving operators a live environment to collect exactly the kind of cycle-life and turnaround data PERCH consumes. Joby has flown piloted wingborne operations in Dubai and is targeting commercial service there this year; Archer is aiming at Abu Dhabi in the third quarter and has been named official air taxi provider of LA28 with a downtown Los Angeles vertiport planned at L.A. LIVE. Against a GAO finding in May that the FAA has still certified no manned electric aircraft for commercial service, Analex is positioning PERCH as infrastructure rather than aircraft, selling it to vertiport developers and fleet operators and submitting its charging-profile and prognostics methodology to SAE and EASA as candidate standard inputs. "Archer's own entry pricing is four to five dollars a passenger mile, and the whole industry knows it has to fall toward one," Patel added. "Nothing in that curve is about the wing. It is about how many times a day a pad turns over and how much of the aircraft's payload survives to the end of its life. That is what we built."

A production-version PERCH installation is targeted for a Gulf vertiport in 2027 and a Los Angeles site ahead of the 2028 Games, with a scaling plan for retrofitting existing heliports where grid capacity permits.