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S1.4 · Hover test

Goal
Demonstrate a stable hover in The pilot commands how far the aircraft pitches or rolls, and how quickly it yaws. Release the pitch and roll controls, and it levels itself. The pilot still maintains altitude and corrects any drift. with S1.4, our 20%-scale winged prototype.
Target date
September 1, 2026 · 9:00 AM PT
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S1.4 · Hover hop · August 20, 2026

Goal
Evaluate the new S1.4 airframe and firmware in a hover hop.
Outcome
S1.4 lifted off and completed a hover hop with our new flight-test engineer and pilot. The test was unsuccessful.
Next
Upgrade the landing gear, simplify the firmware and improve the tilt actuator mechanism before reattempting hover.

Earlier tests

S1.3 · Hover hop · August 6, 2026

S1.3 lifted off and hovered. The test ended in a light crash that damaged that airframe.

S1.2 · Stabilized maneuvering · July 16, 2026

S1.2 completed stabilized roll and pitch maneuvers in winds gusting up to 16 mph.

S1.2 · First hover · July 13, 2026

S1.2 completed its first hover, including liftoff, hover, and touchdown.

S1.1 · Hover attempt · June 26, 2026

S1.1 aircraft after its hover attempt S1.1 Hover attempt

S1.1, our first 20%-scale prototype, lifted off, but a control-software configuration issue drove half the motors higher as the aircraft tried to correct its yaw. We then iterated to S1.2, a hover-only airframe built to prove out hover faster.

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