Toy Stirling engine = best toy ever and best Christmas gift?

How is it until Christmas? 2 months and something. Pretty close. And like every year there will be problem: what to buy someone who has everything? Tough one, right? Sweater? Socks? Toy Stirling engine? I vote for Stirling engine for sure. There is only one precondition: recipient has to like mechanics 🙂

I’ve tested the cheapest toy Stirling engine from china you can get. For less that $20 you get a functional engine model that, surprise, surprise, works. Amazing, right? Here is my video review of it:

Oh, by the way, for me, this is the best toy ever!

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Large wooden BiCopter

You just know a great project when you see one. Like, for example, large BiCopter made from wood and running INAV and flight controller software that kermets has built.
BiCopters might look strange, but the idea is quite simple. Instead of 4 motors, we have 2 motors and 2 servos tilting the motors. Like a one step further from a tricopter.

Similar idea (not the same, only similar) is used on large helicopters like Boeing CH-47 Chinook

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INAV jumped over the bench

Let's say I have almost a good news about sonar support in INAV: yesterday I flew terrain following mode with experimental INAV code. And did not crashed when shooting video below. I did crashed next code version, but that is only a minor detail, right?

  1. When shooting that video I did not touched throttle stick. Altitude control was 100% automatic
  2. It is US-100, not HC-SR04 ultrasonic rangefinder!
  3. US-100 was connected to Omnibus F4 Pro using experimental I2C interface with ATtiny85
  4. If you want to try it, here is the code. But be prepared to crash 🙂

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Chasing airplanes is cool

Chasing airplanes with drones is cool. Do not try to argue 🙂 But airplanes are cool too. So here is a short video my friend shoot some time ago:

Drone pilot: Krystian

Flying wing pilot: me (I had no idea I was chased)

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GPS Racer: worklog #7 – flying at night

Like promised, I took GPS Racer equipped with night vision camera RunCam Night Eagle and IR projectors for a night flight. And it worked. Not as good as I expected, but worked.

  1. RunCam Night Eagle is sensitive enough to fly at night. Just like that. As long as there is at least some light, you can fly. In my case, full moon and some residual light was fully enough
  2. IR projectors (3W in total) are underpowered. They help, but up to 3-4 meters. Not any further
  3. Propellers flooded with IR are no bright… I will have to look for some black props…
  4. OSD started to flicker out of the blue. I suspect new BEC for IR projectors introduces some noise. I will have to fix it somehow…

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Gyroscope and filtering video tutorial – Episode 1

I’m not completely sure why, but I’ve been pushing this topic away for quite a long time now. But it’s finally time to present it in this blog too. So, here we go.

Something like 3 month ago I’ve started to record and publish a video series about basics of gyroscope data processing in modern flight controllers (Betaflight, INAV, Cleanflight). It started as a tutorial how to setup notch filters in INAV, but ended up as a much bigger thing. Series consist of 4 episodes where I use Blackbox logs to show gyroscope signal noise and how to fight with it. Over next few days I will be posting links to those videos here, but if you eager to see them sooner, just use this link.

In Episode 1 I talk about:

  • Gyroscope noise sources
  • How unfiltered, raw, gyroscope signal looks like
  • How noise sources manifests in gyro traces
  • How filtered gyroscope signal looks like

Ah yes, I’m running a YouTube channel too, feel free to subscribe 🙂

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