Ascendance Reaches Structural Milestone in the Development of Its Hybrid-Electric Aircraft ATEA

French start­up Ascen­dance has announced its ATEA hybrid-elec­tric air­craft has entered its final inte­gra­tion phase, with the com­ple­tion of a demon­stra­tor at its Toulouse facil­i­ty.

Engi­neered under the direc­tion of Ascen­dance’s teams and man­u­fac­tured by DUQUEINE Group, this strate­gic mile­stone marks the cul­mi­na­tion of years of design work, aero­dy­nam­ic opti­mi­sa­tion and indus­tri­al­i­sa­tion.

Along­side ATEA’s devel­op­ment, Ascen­dance is already putting its STERNA hybrid-elec­tric tech­nolo­gies to work with part­ners, notably in the drone sec­tor as well as for civ­il avi­a­tion. These col­lab­o­ra­tions val­i­date the hybrid archi­tec­ture in oper­a­tional envi­ron­ments, demon­strate its robust­ness across diverse mis­sion pro­files, and accel­er­ate the indus­tri­al matu­ri­ty of the tech­nol­o­gy. 

Jean-Christophe Lam­bert, CEO, Ascen­dance, said: “ATEA’s entry into its final inte­gra­tion phase is a par­tic­u­lar­ly sig­nif­i­cant moment for our teams. It brings to life years of design, hybrid-elec­tric propul­sion test­ing, and avion­ics val­i­da­tion. 

“ATEA is not just an air­craft — it is the demon­stra­tor of a com­plete archi­tec­ture com­bin­ing hybrid-elec­tric propul­sion, dis­trib­uted propul­sion, and fly-by-wire flight con­trols. 

“This is proof that our con­vic­tion around hybrid-elec­tric avi­a­tion is tak­ing shape. It is not sim­ply a vision for the future of avi­a­tion,  it is a prag­mat­ic, oper­a­tional solu­tion to accel­er­ate decar­boniza­tion and strength­en our posi­tion in this crit­i­cal sec­tor of aero­space.”

A Break­through Archi­tec­ture, the Result of Years of Design and Val­i­da­tio

Pri­or to the launch of pro­to­type pro­duc­tion, ATEA’s archi­tec­ture under­went advanced design cam­paigns, struc­tur­al analy­ses, aero­dy­nam­ic stud­ies and wind tun­nel test­ing. This work val­i­dat­ed the archi­tec­tur­al choic­es spe­cif­ic to a hybrid VTOL air­craft inte­grat­ing dis­trib­uted propul­sion and fly-by-wire flight con­trols.

With the struc­ture now in place, full inte­gra­tion can begin of:

• The STERNA hybrid-elec­tric propul­sion sys­tem, devel­oped by Ascen­dance, inte­grat­ing Safran’s ENGINeUS elec­tric motor
• A dis­trib­uted propul­sion archi­tec­ture, full avion­ics sys­tems and flight con­trol sys­tem
• Fly-by-wire flight con­trols — key ele­ments of the new more-elec­tric air­craft archi­tec­tures

Four Years of Hybrid Test­ing and Avion­ics Val­i­da­tion

ATEA’s entry into inte­gra­tion is the out­come of a four-year mat­u­ra­tion cycle. Ascen­dance’s hybrid propul­sion sys­tem has under­gone more than 500 hours of con­tin­u­ous bench test­ing, val­i­dat­ing its archi­tec­ture, tech­nolo­gies and equip­ment, reli­a­bil­i­ty and per­for­mance.

In par­al­lel, avion­ics sys­tems and flight con­trol laws were test­ed through advanced flight sim­u­la­tions inte­grat­ing the full oper­a­tional chain: com­plete cock­pit, inte­grat­ed onboard sys­tems, and ground com­mu­ni­ca­tions.

These cam­paigns were con­duct­ed with Ascen­dance’s test pilots and also involved EASA-cer­ti­fied pilots, con­tribut­ing to the robust­ness of the con­trol archi­tec­ture and its com­pli­ance with reg­u­la­to­ry require­ments.

This inte­grat­ed approach, hybrid-elec­tric propul­sion, avion­ics, and flight con­trols, posi­tions ATEA as a tech­no­log­i­cal­ly mature plat­form.

A Dual-Use Air­craft for Civ­il and Defense Appli­ca­tions

ATEA embod­ies a prag­mat­ic and ver­sa­tile approach to elec­tric hybridiza­tion. Its dis­trib­uted hybrid-elec­tric archi­tec­ture enables:

• Sig­nif­i­cant improve­ment in ener­gy per­for­mance
• Reduced fuel con­sump­tion and CO₂ emis­sions
• Adapt­abil­i­ty to civ­il mis­sions and defense appli­ca­tions

The ver­sa­til­i­ty of its appli­ca­tions — pas­sen­ger, car­go, med­ical, and secu­ri­ty mis­sions — is a defin­ing axis of the pro­gram.

A Euro­pean Ambi­tion Built on Tech­no­log­i­cal Mas­tery

Designed, assem­bled and test­ed in France, ATEA is the prod­uct of a nation­al and Euro­pean indus­tri­al ecosys­tem unit­ed around a shared ambi­tion: build­ing a sov­er­eign hybrid-elec­tric avi­a­tion sec­tor.

Through its STERNA hybrid-elec­tric tech­nolo­gies and the ATEA demon­stra­tor, Ascen­dance is devel­op­ing an inte­grat­ed approach com­bin­ing:

• Mas­tery of hybrid-elec­tric and dis­trib­uted propul­sion
• Advanced avion­ics archi­tec­ture
• Flight con­trol laws and fly-by-wire flight con­trols
• Full sys­tem inte­gra­tion

This mile­stone strength­ens Ascen­dance’s ambi­tion to posi­tion itself in Europe as the leader in high-per­for­mance, dual-use, and exportable hybrid-elec­tric solu­tions, capa­ble of meet­ing both decar­boniza­tion require­ments and strate­gic resilience imper­a­tives.

Found­ed in 2018 by Lam­bert, Thibault Bal­divia, Clé­ment Dinel and Benoît Fer­ran, Ascen­dance designs and indus­tri­alis­es next-gen­er­a­tion hybrid-elec­tric propul­sion sys­tems to meet the decar­boniza­tion and per­for­mance chal­lenges of civ­il and defense avi­a­tion. It is dri­ven by the con­vic­tion that hybrid-elec­tric opens a new era of mod­ern avi­a­tion.

Backed by  Bpifrance, the France 2030 pro­gram, and the Région Occ­i­tanie, the start­up devel­ops STERNA Hybrid Pack, an inno­v­a­tive dual-use hybrid-elec­tric propul­sion sys­tem com­bin­ing per­for­mance, range, and emis­sions reduc­tion.

This hybrid propul­sion sys­tem pow­ers ATEA, a ver­ti­cal take­off and land­ing (VTOL) air­craft designed as a low-car­bon alter­na­tive to light heli­copters for region­al air trans­port — pas­sen­gers, car­go, med­ical, and secu­ri­ty mis­sions. Ascen­dance thus car­ries a dual civ­il and defense ambi­tion in ser­vice of a sov­er­eign aero­nau­ti­cal tran­si­tion.