Product — Gen3

Gen3.

The FlyONSPEED Gen3 box is the third generation of OnSpeed and the first one we are producing in volume. Two pieces in the box: the main unit (ESP32-S3, three Honeywell pressure sensors, integrated IMU, microSD logger), and a panel-mount indexer that shows the tone visually. First production run ships for AirVenture 2026.

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01 — Kit

What ships.

The main board. ESP32-S3 microcontroller, three Honeywell HSC differential pressure sensors plumbed for pitot, AOA, and static, an integrated IMU, and a microSD slot for flight logs. About the size of a deck of cards.

The indexer. A small panel-mount display built on the M5Stack platform, showing the same tone information visually. Useful in IFR conditions, in noisy aircraft, or when a glance beats listening.

Cabling, mounting hardware, and a microSD card. The kit assumes an AOA-equipped pitot or boom probe (pitot, static, and AOA pressure lines) and a 12V electrical bus already in the airplane.

02 — Airframes

Where we have flown it.

Eight Van's RV variants: RV-3, RV-4, RV-6A, RV-7, RV-8, RV-9A, RV-10, RV-14. A Harmon Rocket. A Sling LSA. A Sling 4 TSI.

Any experimental aircraft with an AOA-equipped pitot or boom probe and a 12V electrical bus is a candidate. The calibration process is the same regardless of airframe. If you are flying something not on this list, we want to hear about it.

03 — Avionics

What it works with.

EFIS by serial: Dynon SkyView and HDX, Garmin G3X and G3X Touch, MGL, GRT, VectorNav. Or fully standalone — pitot, AOA, and static sensed directly, no EFIS required.

Audio output is line-level, into any audio panel that accepts an unswitched aux input. Installed with PS Engineering PMA450 and PMA8000, with Garmin GMA panels, and with Flightcom intercoms.

Protocol-level details and pinouts are in the technical docs at dev.flyonspeed.org.

04 — Not included

What we do not ship.

A heated pitot. If your mission needs one, source from Dynon or Gretz. Both are good. Either works with OnSpeed.

An audio panel input. Most panels have one. The installation docs cover the common configurations.

12V power. The system draws less than 100 mA in cruise.

An EFIS. OnSpeed runs without one — it senses everything it needs from its own three pressure sensors and IMU. Most pilots install it alongside an existing EFIS for the digital airspeed and altitude feed.

05 — How

How it works.

Three differential pressure sensors read pitot, AOA, and static at 50 Hz. The integrated IMU fuses with that pressure data to produce a body-angle estimate.

A calibration curve, established during a single flight per flap setting using the built-in calibration wizard, maps body angle to a percent-of-stall figure for the current configuration. That percentage drives a tone — pitch and pulse rate — into the pilot's headset.

The technical version of all of that is at dev.flyonspeed.org.

06 — Source

The firmware is open source.

Firmware is open source under the MIT License. Hardware design files aren't open yet — that's the direction we're heading. For now the kit is how we make Gen3 available to builders.

github.com/flyonspeed/OnSpeed-Gen3 →

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07 — FAQ

Common questions.

What aircraft does it work in?

Any experimental with an AOA-equipped pitot or boom probe and 12V electrical. Tested in eight RV variants (RV-3 through RV-14), a Harmon Rocket, a Sling LSA, and a Sling 4 TSI.

What EFIS does it work with?

Dynon SkyView and HDX, Garmin G3X and G3X Touch, MGL, GRT, VectorNav. Or fully standalone. Protocol details at dev.flyonspeed.org.

Do I need a heated pitot?

For IMC or visible moisture, yes. We do not sell one. Source from Dynon or Gretz.

What is the indexer?

A small panel-mount display showing the same tone information visually. Built on the M5Stack ESP32 platform. Included in the kit.

When does it ship?

Targeting AirVenture 2026 for the first production run.

What will it cost?

Pricing finalizes once the BOM is locked. We'll announce when the first run is ready to order.

Is it certified?

No. OnSpeed is for experimental aircraft only.

Is everything really open source?

Firmware is open source under the MIT License. Hardware design files aren't open yet — that's where we're heading. The kit is how we make Gen3 available today.