INAV 2.1 finally introduced DSHOT and just like we expected, introduced some problems. Like quads falling out of the sky. The problem is more prosaic: it is the hardware or to be more specific the cable. The longer the signal cable between FC and ESC gets, the more probable it is that it will not be able to transfer DSHOT. Things like slew rate and bandwidth show themselves.
How often, when you watched or read a brushless motor review you've heard a sentence like "this motor will not have any problem spinning a heavy propeller" or "this motor is designed for light propellers". Or "this is a very light propeller". But what does that really mean?
Thanks to our good friend Sir Isaac Newton we know that
F = ma
F is the force,
a is acceleration and
m is the mass of an object. In this case, mass is the unit of inertia. This is all true for propellers if you want to throw them in linear motion. But propellers rotate and that changes a few things. Instead of mass we are interested in the moment of inertia and mass distribution around the rotation point.
I took my 7-inch SourceOne for a spin with a gimbal onboard on a probably first really warm day this year. The results are encouraging, gimbal really helps to get very nice and smooth HD video footage…
I've bought a couple of cheap 18650 on Aliexpress and tested them with a DIY OpenSource OpenHardware Arduino based battery discharger. Here are the results of super brands like Mr. Henry, UltraFire, GTL EvreFire, SkyWolfEye and so on… Are they worth the price? Well… my discharger says: NO!
Looks like FrSky R9 system (R9M TX and R9 Slim, Mini and R9MM family) are finally a usable product. With latest FLEX firmware released and OpenTX 2.2.3 on the loose, it's a good idea to upgrade all R9 gear and finally do not have to worry about FCC and EU-LBT versions.
After months of trying FrSky finally solved (hope so) all the issues with R9 long range radio system and with latest FLEX firmware it appears to be finally ready!
Crazy cheap 7 inch quadcopter frame for freestyle? Alfa Monster all the way!
In this episode of The News
- INAV 2.1 is here and we have a lot of code waiting for INAV 2.2
- Betaflight 4.0 is coming closer and closer together with RPM filter that analyzes RPMs of motors (via ESC telemetry) to set up very narrow notches. What a nice idea!
- Something very fresh in terms of hardware: Mateksys aka Matek has built their own 4in1 ESC. But instead of doing what everybody else is doing (putting 4 separate BlHeli ESCs on one board) the wrote their own ESC firmware, flashed a single STM32F405 with it and called it a day. Of course it took much longer than a day (a year) but finally something very very fresh in the 4in1 ESC world! Kudos, I can not wait for the actual hardware