Betaflight 4.1 broke VTX control. Right now, you can not set band, channel and power level over SmartAudio or Tramp protocol right after flashing Betaflight 4.1. To be able to use SmartAudio or Tramp protocol like you used to do, you have to configure something that is called VTX tables.
Which is better: Idle Up or Airmode? Which one to use since the best pilots are stating that Idle Up is better than Airmode (Mr Steele). Different pilots state that Airmode is better than Idle Up. So, what is the truth? I’m not the best pilot in the world. Hey, I’m not even good enough to be considered very good, but I know my stuff and I can program. More than that, I know how the flight controller is working internally. And that gives me an edge…
The next major release of Betaflight will be 4.0 with new and improved Dynamic Filtering. For now, today I only did a quick test of Betaflight 4.0 running on my TBS Source One 7-inch FPV drone. No tuning, no playing with settings. I only flashed, set modes and radio and that’s all. I pretty much like how it feels. This quadcopter was mainly doing cruising, no freestyle, and it felt good to put those props into more demanding use. Yes, Betaflight 4.0 has a good chance to be just awesome…
- TBS Source One v0.11 7-inch
- Motors: EMAX RS2 2206 1600KV
- Propellers: Gemfan FLASH 7042
- ESC: DYS XSD30A
- FC Matek F722-STD with Betaflight 4.0
- PDB: Matek FCHUB-6S
A note about the sound. It indeed sounds like a V8 engine. Bear in mind, that those are default settings and Gemfan FLASH 7042 props are light and do not like to have too much D gain.
When two weeks ago I said that you should only 8 channels when using FrSky SBUS I meant it and you just had to take my word for it. Today a small proof how Betaflight 3.5 feedforward component looks on the Blackbox with 16 channels and 8 channels. Of course, in both cases, RC smoothing type FILTERING was chosen.
SD cards are cool: cheap, reliable, a lot of space and you can remove them from the drone and read on a PC. But sometimes, it's really hard to take them out. Either SD slot is in a strange place, or FC is oriented in a strange way or an FC designer has put an SD slot in a most stupid place of them all…
You can use Betaflight 3.4 as an SD card reader (MSC standard compatible) and either use it do get your blackbox logs via USB cable or use it, if you really want to, as a pendrive. With drag and drop and all that stuff. All you have to do is to go to CLI and type "msc" and hit enter. That's all! It's not perfect, but works!
Betaflight 3.5 is just around a corner and it brings new cool things. There is no more Dterm setpoint weight and Dterm setpoint transition (relaxation ratio). They all were replaced by easier to understand Derivative and Feedforward (Feed Forward when you refer to the control theory tho).
Betaflight Derivative and Feedforward parameters are the new way of controlling "damping force" of the Dterm and responsiveness of a drone. The more Derivative gain you set, the more "damped", "delicate" and "swooshy" drone will be. The more Feedforward gain you apply, the more responsible to the sticks it will be. It's almost the same as with Dterm setpoint weight, but in my opinion, made simpler and can be set separately for each axis.
Competition from Butterflight changed the game. I might not be the biggest fan of Butterflight, but one thing is sure: thanks to it, Betaflight took a big lead forward. The best example of it is Betaflight 3.4 that currently is in Release Candidate stage.
The most important changes, that really influences flight (there are more not flight related changes, I will cover them separately) are revisited filtering and PID defaults:
- Dynamic filtering enabled by default
- Antigravity enabled by default
- Gyro stage 1 LPF bumped to 100Hz
- Gyro stage 2 LPF (not) Kalman FIR2 filter set at 300Hz
- Dterm filter type set to PT1
- Gyro notch filters disabled
- Dterm notch filter disabled
- Revisited PID gains
Now, it flies wonderfully!