Onboard camera · S1.9 · October 2 · wings at 10°

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We tripled flight testing from August to September.

Aug 1Aug 15Sep 1Sep 15Oct 1Lifted offAug 6First stable hoverSep 6Yaw under controlSep 15Box patternSep 19Best hover yetSep 24Wings tilt 5° and 10°Oct 2Wings tilt 15°Oct 3Transition angle 30°Oct 4Light crashUnsuccessful hopHard landingHard landing18G crashYaw disturbance14 flights in 4 daysTest went as plannedCrash or hard landingIssue found, debugging Aug 1Aug 15Sep 1Sep 15Oct 1Lifted offAug 6First stable hoverSep 6Yaw under controlSep 15Box patternSep 19Best hover yetSep 24Wings tilt 5° and 10°Oct 2Wings tilt 15°Oct 3 · Yaw disturbanceTransition angle 30°Oct 4Light crashUnsuccessful hopHard landingHard landing18G crash14 flights in 4 daysTest went as plannedCrash or hard landingIssue found, debugging

Next test

S1.9 · 30° Transition Angle, Longer Holds

Goal
Repeat the 30° The shift from hovering on rotor thrust to flying on the wings as the aircraft tilts its wings forward and gains speed. angle with longer holds and larger roll and pitch inputs, then keep expanding the transition envelope if the flight data looks good.
Target date
To be announced.

Latest test

S1.9 · 30° Transition Angle · October 4, 2026

Goal
Step S1.9's transition angle up from 15° in one morning, with full flight logging back, and fly roll inputs with the wings tilted.
Outcome

S1.9 reached a 30° transition angle, up from 15° the day before. Over six flights we went 15°, 20°, 25° and then 30°, returning to hover and landing safely each time. Yaw control stayed steady as the wings tilted, so we kept stepping up.

At 30°, S1.9 averaged about 30 km/h airspeed. On the final flight, winds at altitude were an estimated 15 to 19 km/h, roughly twice what we measured on the ground. S1.9 stayed in control through the transition and flew back into that wind to land.

Next
Next, we validate these patterns with longer holds and larger roll and pitch inputs, use more of the runway, and keep adding transition angle.

Earlier tests

S1.9 · First 15° Wing Tilt · October 3, 2026

First 15° wing tilt, filmed from the ground with the onboard camera inset. A yaw disturbance right after reaching 15° is what we're debugging now.

S1.9 · First Transition Tests: 10° Wing Tilt · October 2, 2026

S1.9 started transition testing: its wings tilted 10° forward from hover and back. This full flight is filmed from the onboard camera, with pilot-input and measured-attitude overlays.

S1.8 · From 18G Crash to Our Best Hover Yet · September 24, 2026

Five days after an 18G+ crash, S1.8 flew our best hover yet: precise 90-degree turns, far less motor thrust spent on yaw, and cooler motors. This full flight includes pilot-input and measured-attitude overlays.

S1.7 · First Altitude-Mode Box Pattern · September 19, 2026

S1.7 completed its first altitude-mode box pattern, less than two weeks after S1.5's first hover. We've gone from unwanted turning and drift to controlled hover maneuvers.

S1.7 · Hover Maneuvers · September 18, 2026

Across five flights, automatic yaw surface assistance improved heading control and tuning changes improved hover consistency. This complete final flight includes pilot-input and measured-attitude overlays, a roll maneuver, an altitude-mode test and the landing.

S1.6 · Yaw Maneuvers in Hover · September 15, 2026

Successful piloted hover with five heading changes and substantially improved yaw response. Persistent left yaw still required pilot correction.

S1.6 · Flight 1 · September 12, 2026

Successful first test in relatively still air. Wind prevented the planned yaw tuning and control-surface tests later in the session.

S1.5 · Hover 2 · September 6, 2026

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.

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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