All-Tilt or 12-Tilt-6: How Joby and Archer Cross the Transition

Both aircraft take off on propeller thrust and cruise on a wing; the difference lies in how many thrust sources they carry through the handover and what becomes inactive afterward.

Three flight regimes, not two

Descriptions of eVTOL flight often jump from hover to airplane cruise as if a switch were thrown. The hard part is the interval between them. At low speed the wing contributes little, so propellers support nearly all the weight. As airspeed rises, wing lift grows, induced power falls and the propulsion system redirects more effort forward. Control surfaces also gain authority. The aircraft must remain stable while every one of those contributions changes.

Joby and Archer solve that scheduling problem with fly-by-wire control, but they present the controller with different hardware. Joby tilts all six propulsion units through the transition. Archer starts with twelve vertical thrust sources, rotates the forward six toward cruise and progressively removes demand from the fixed aft six.

Joby’s continuously useful propellers

On the Joby aircraft, no propeller is designated only for takeoff. In hover, the six units point upward. During acceleration, their tilt angle produces both vertical and forward force while the wing begins to load. In cruise, all six point forward. The arrangement avoids carrying a separate set of stopped lift propellers, and it gives the controller six thrust vectors that can change direction.

The cost is actuation. Every nacelle has to reach and hold commanded angles, and the aircraft must tolerate credible actuator, sensor or power faults without producing an uncontrollable asymmetry. Tilt rate, synchronization and structural loads become flight-critical. Joby’s public architecture pairs this with dual critical actuation systems and a triple-redundant flight computer, but detailed failure schedules belong to certification data rather than marketing pages.

Archer’s division of labor

Midnight’s aft propellers are optimized around vertical lift and do not need a tilt mechanism. Its forward propellers perform both lift and cruise jobs. During transition, the fixed set can keep contributing upward force while the forward axes move, potentially giving the control laws a clear separation of roles. Once the wing supports the aircraft, the aft blades stop and the forward six supply thrust.

This is not classic “lift plus cruise” in the strictest sense, because the forward propellers also provide vertical lift and tilt. Archer’s own “12-tilt-6” label is more accurate. The arrangement trades six tilt mechanisms for six lift-only propulsion stations that remain installed during cruise. Their stopped drag, structural weight and restart behavior are part of the aircraft-level balance.

Control authority moves around the vehicle

In hover, changing individual propeller thrust creates roll, pitch and yaw moments. In cruise, ailerons and tail surfaces increasingly do that work. Between those points, the controller blends distributed propulsion, tilt angle and aerodynamic surfaces. A gust does not wait for the aircraft to complete the blend, so the state estimator must know airspeed, attitude, rates, actuator position and available thrust continuously.

Joby’s all-tilt geometry may offer vectoring options across every station, but it also couples tilt behavior across the full set. Archer retains vertical-only stations during much of the handover, but eventually commands them toward zero while relying on the forward units and wing. These are different control-allocation problems, not simple “advanced” and “traditional” categories.

Energy and failure cases decide the result

Hover power dominates short missions because supporting weight without wing lift is expensive. Transition duration therefore matters: a controller that reaches efficient wing-borne flight promptly can protect reserve energy. Yet rushing the process can narrow handling margins or increase passenger discomfort. The best schedule is one the aircraft can repeat across weight, wind, temperature and degraded-system cases.

A meaningful comparison would show height loss after a propulsion fault, rejected-transition behavior, crosswind limits, minimum controllable speed, energy used from pad to cruise and the safe path back to vertical landing. Public videos confirm that both configurations can transition. They do not reveal the edges of the approved envelope.

Certification turns physics into procedures

The FAA treats these machines as powered-lift, a category that combines airplane-like and helicopter-like characteristics. Its rules address pilot qualification and operations, while each type-certification program has aircraft-specific airworthiness criteria and test plans. For an operator, the outcome appears as limitations, checklists, training and dispatch rules—not a generic judgment about which diagram looks simpler.

Community acceptance will add another practical test. A transition profile that saves energy but concentrates an unpleasant tone over one neighborhood may be changed operationally. Published approach paths, measured sound and energy per flight will reveal whether the control schedule works outside a flight-test range.

Passenger comfort belongs in the same test plan. Acceleration, deck angle, vibration and the timing of thrust changes can turn an aerodynamically valid transition into an operational profile an airline would avoid repeating.

Bottom line

Joby makes every propeller earn a cruise role and accepts six tilting assemblies. Archer simplifies the aft stations mechanically and accepts inactive lift hardware in cruise. Flight tests, failure tolerance and energy through transition—not the shorthand label—will show which compromise works better for a given route.