About

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Male


Please tell us a bit about your UAV interest

I build drones


Hometown:

Amstelveen


Activity Feed

sander posted a blog post
Skyqraft, a data-driven infrastructure inspection company from Sweden, was granted BVLOS operation permission for the Vertical Technologies DeltaQuad VTOL UAV, to inspect a large portion of the Swedish power grid.Fully AutonomousFlying fully…
Jul 14
sander posted a blog post
Vertical Technologies has successfully integrated the new Sony A7R mark IV on the DeltaQuad Pro #MAP VTOL UAV. This release marks the first VTOL mapping UAV that supports 61 megapixel mapping.Earlier this year Sony announced the release of their…
Dec 17, 2019
sander commented on sander's blog post The problem with airspeed sensors
"Hi Alex,
Sorry it took a while to respond, but lets go:
> not sure about the "new"-ness of this featureI never claimed it was new.
> I don't think your unit is IP64 rated either, even without an AS sensor, so let us not go thereAny vehicle with…"
May 4, 2019
sander commented on sander's blog post The problem with airspeed sensors
"Hi Tom,
I never suggested this was anything new on PX4. It's been available for almost 2 years now."
May 4, 2019
sander commented on sander's blog post The problem with airspeed sensors
"No, that would require an impossible level of fine tuning on your actuators"
Apr 9, 2019
sander commented on sander's blog post The problem with airspeed sensors
"@andreas 
You need to distinguish between 2 processes:
1. Keeping the vehicle flying stable2. Estimating airspeed

Process 1 only uses estimated airspeed to scale actuator outputs (elevons). The transient phase is not a real concern there. It uses a…"
Apr 8, 2019
sander commented on sander's blog post The problem with airspeed sensors
"If you know the voltage, motor IR, motor KV, prop size, type and pitch angle you can calculate thrust. a bit like how eCalc does it.
But from a control perspective the absolute thrust value is not as relevant, its about knowing the scale factors,…"
Apr 5, 2019
sander commented on sander's blog post The problem with airspeed sensors
"Also, you cannot compare GPS speed to airspeed unless you fly perfect circles and average the wind factor out."
Apr 4, 2019
sander commented on sander's blog post The problem with airspeed sensors
"Hi D J,
We eliminated the pitot tube and AoA sensor. The voltage sensor is used (among others) to compensate.

You can try calibrating such a setup by mounting it on a car (we did that too), but you will find that the drift will happen in your UAV…"
Apr 4, 2019
sander commented on Patrick Meier's blog post New: Online course on Cargo Drones in Public Health
"Hi Patrick,
Looks good, i'll forward this to our other NGO partners, they will surely be interested.
PS: the TEDx link below your post is deadPS2: love the dramatic DeltaQuad picture at 6:50 in the video :)"
Apr 4, 2019
sander commented on sander's blog post The problem with airspeed sensors
"The image i selected depicts the convoluted and fragile setup required to get airspeed readings on a UAV, In this case indeed it includes an AoA sensor."
Apr 3, 2019
sander commented on sander's blog post The problem with airspeed sensors
"Perhaps i was not completely clear on my previous comment. When i mention voltage i mean the data from the voltage sensor, so you get the exact voltage sent to the motor, this accounts for voltage drop and does not require internal resistance. We do…"
Apr 3, 2019
sander commented on sander's blog post The problem with airspeed sensors
"@Andreas: voltage and known thrust curve of the motor"
Apr 3, 2019
sander commented on sander's blog post The problem with airspeed sensors
"Hi Mike,
I did not say it was "just released", i wrote one about 12 months ago.
http://docs.px4.io/en/config_vtol/vtol_without_airspeed_sensor.html"
Apr 3, 2019
sander commented on sander's blog post The problem with airspeed sensors
"@Mike
Thank you for your kind feedback :)
> Other onboard sensors have similar or even worse problems than those mentioned
You are correct that drift occurs on the other sensors too, however, the drift on those sensors, although significant to the…"
Apr 2, 2019
sander commented on sander's blog post The problem with airspeed sensors
"@Graham all code we produce on the primary avionics is merged upstream and available in PX4. I also wrote a tuning guide in the PX4 docs. It just takes quite some tuning to get it right."
Apr 2, 2019
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