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S1.6 · Yaw Authority Flight Tests

Goal
Test The aircraft’s ability to turn its nose in the commanded direction. with the control surfaces in still conditions: tune yaw gains, then test control-surface deflections intended to increase yaw authority.
Target date
September 13, 2026 · 8:00 AM Pacific

Latest test

S1.5 · Hover 2 · September 6, 2026

Goal
Demonstrate a stable hover with S1.5, our 20%-scale winged prototype.
Outcome

Turning response felt better after adjusting the controls, but unwanted turning and drift remained. We consider this test successful, even with the hard landing. No appreciable damage, just light repairs with an expected one-day turnaround.

Next
Dig into the logs alongside the pilot feedback to improve the tune, meaning how strongly and quickly the aircraft responds. We'll also evaluate whether we need the control surfaces to give us more ability to steer and stabilize the aircraft in hover.

Earlier tests

S1.5 · Hover 1 · September 6, 2026

We flew a short hover test. It was a reasonable first hover, with no appreciable damage. Unwanted turning and drift still required attention.

S1.4 · Hover hop · September 1, 2026

We were testing simpler firmware, a new landing gear design and tilt mechanism design. It was unsuccessful and ended in a hard landing.

S1.4 · Hover hop · August 20, 2026

S1.4 lifted off, but the hover attempt was unsuccessful. We returned to ground testing before trying again.

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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