Aircraft · Long-term plans

Engines first. Aircraft next.

CONCEPT ONLY · NO AIRCRAFT SPECIFICATIONS PUBLISHED

An aircraft is only as certifiable as its engine. We're proving the hydrogen engine first, then designing aircraft around it.

Why we start with the engine

The engine is the hardest new part.
Burning hydrogen changes the combustor, fuel system and controls. Prove those, and the rest of the aircraft is engineering you already know.
It’s the fastest path to evidence.
An engine program produces test data years before an aircraft could fly.
It serves more than one aircraft.
An engine can power new designs and, potentially, conversions of existing aircraft types.

How we'll approach the aircraft

The aircraft family will be defined by trade studies after our engine reaches performance testing. These principles guide that work:

The same standards that guide our engine program guide the aircraft.

Tanks, lines and venting designed around hydrogen from the start, not adapted later.

Refueling and ground operations that fit real airports and the hydrogen supply chains forming around them.

An aircraft airlines can actually run at a profit, not only a technology demonstrator.

Clean-sheet design around ColibriV engines

Trade studies after Phase 3

Re-engining with hydrogen propulsion and a new fuel system

Under evaluation

A flight testbed to gather in-flight data

Planned with an approved design or production organization partner

For airframers and airlines

If you're planning for hydrogen in your fleet or your next aircraft, we'd like to hear what you need from an engine.

Aircraft plans are long-term and subject to engine test results. See the forward-looking statement in the footer.