Airspeed telemetry for CRSF

[MrMap]

Current Behavior

Airspeed not available in OpenTX telemetry page - using TBS crossfire protocol and MATEK F765 Wing with digital Airspeed sensor. Airspeed available in OSD (so the sensor and FC have it)

Desired Behavior

I would like airspeed data to be injected into the CRSF telemetry data stream along with the multitude of data already available there

Suggested Solution

I suggest a feature - possibly in collaboration with the TBS dev team - alter the software to include airspeed, when airspeed sensor is available
Feature Requests without suggested solutions may not be addressed with the same level of urgency as those that have suggested solutions

Who does this impact? Who is this for?

Who is this for? Airplane users with OpenTX radios / TBS CRSF and a plane with airspeed sensor.

Additional context

Airspeed data into OpenTX telemetry is very useful as it is the primary parameter for flight dynamics. When present it can trigger warnings, add to useful log data and assist (e.g. voice reporting) in keeping desired speed with regard to situation - approach and landing in particular.
As per today my system are on latest stable software releases of OpenTX, TBS tx module, TBS Diversity RX and F765 FC and iNav configurator

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[MrMap]

I just noticed that Airspeed data gets logged in the Blackbox file - but only the raw values and there are no decoded values.

[HenHan85]

when using the inav telemetry widget for OpenTX (Horus), the option to choose airspeed sensor (instead of GPS Speed) in the widget setting is not available. Quite sure because there is no telemetry sensor signal coming throug crsf, providing the airspeed sensor signal.
Would be great to have it included for this purpose

https://github.com/iNavFlight/OpenTX-Telemetry-Widget

[alexgalstyan]

Hello,
Is this issue was resolved ?

[pnduffy]

I tried getting airspeed telemetry with CRSF protocol, over ExpressLRS, but no airspeed selection is available in the LUA script. I didn't see if this was closed for a solution or not. Any comments?

[Enggmaug]

Hello,

I'm looking for the very same thing : Pitot data through ExpressLRS CRSF telemetry.

If I understand this page : it should be already possible... But I still don't see how... and I can't find anything in the wiki or documentation to achieve it.

[uwe-air]

Hi same here. PLEASE try to get this done. So i can get an stallwarning working .

[pnduffy]

I compiled a custom version of INav to get airspeed. Not sure if it's in the mainline yet.

[MrD-RC]

Hi same here. PLEASE try to get this done. So i can get an stallwarning working .

Airspeed shouldn't be used for stall warnings. Stalls can still happen at higher airspeeds. Stalls are caused by separation of airflow from the wing.

[MrMap]

Hi same here. PLEASE try to get this done. So i can get an stallwarning working .

Airspeed shouldn't be used for stall warnings. Stalls can still happen at higher airspeeds. Stalls are caused by separation of airflow from the wing.

It is correct that stall speed (Vs) is not a constant but a function of factors, e.g. weight, configuration and g-load.
However, airspeed is the only speed relevant to flight dynamics, hence including it in the CRSF telemetry protocol is desirable and frankly, surprising that it did not make it´s way in from the beginning.

Though stall speed can vary, using airspeed as a low speed warning is a great idea. This warning indicates that you are flying with low margin to stall speed promt the pilot to take proper action. Typical situation is final approach with an aircraft. On my Avanti S I have my radio read the airspeed repeating every few seconds during final approach (using FrSky RX and FrSky series sensor.

I even made a setup in Edge TX adapting the gyro gain to the airspeed, hence optimizing the gyro performance all over the speed range.
Airspeed is not only useful, it´s central.

[sensei-hacker]

It is correct that stall speed (Vs) is not a constant but a function of factors, e.g. weight, configuration and g-load. However, airspeed is the only speed relevant to flight dynamics, hence including it in the CRSF telemetry protocol is desirable

Yes, airspeed is an important parameter if you were trained as / like a full size pilot.

It is ALSO important to understand that you can stall at any speed. Someone who thinks the plane won't stall until a particular speed is also a person whose planes keep inexplicably dropping out of the sky during base turn.

[OptimusTi]

Airspeed is not in the CRSF protocol. Please reach out to TBS to add it.

[MrMap]

It is correct that stall speed (Vs) is not a constant but a function of factors, e.g. weight, configuration and g-load. However, airspeed is the only speed relevant to flight dynamics, hence including it in the CRSF telemetry protocol is desirable

Yes, airspeed is an important parameter if you were trained as / like a full size pilot.

It is ALSO important to understand that you can stall at any speed. Someone who thinks the plane won't stall until a particular speed is also a person whose planes keep inexplicably dropping out of the sky during base turn.

Yes, good point - but not a reason against having airspeed in the CRSF telemetry protocol.

On a side note, AOA - Angle Of Attack - is a very useful parameter to monitor while staying out of stall trouble.
Unfortunately I have never seen such a sensor for RC use. Maybe too mechanically messy and expensive to translate into RC plane size. But it would be cool.