The news: FrSky ACCESS, BF4.0, F7, SP Racing H7, F7, INAV Radar and Russian Drones In Space

  • FrSky has announced new air protocol: ACCESS
  • Betaflight 4.0 is just around the corner
  • The topic of F7 as in STM32F7 flight controllers and INAV
  • INAV Radar.
  • Dominic Clifton aka Hydra, known from Cleanflight and Seriously Pro Racing (SP Racing F3, SP Racing F4, SP Racing F7 and so on) is preparing something new: flight controller based on STM32H750 processor: SP Racing H7 Extreme -Russians are putting drones into space! Cosmic Drones you might say.

This is my 7-inch TBS Source One

This is my 7-inch version of TBS Source One quadcopter frame. So far, so good, Source One is really tough and stiff frame so all the problems with resonance and oscillations in flight should be over. And looks like they are over.

It might sound like a good old V8 engine but flies smooth. And after all, that was my ultimate goal. So let’s say “bye, bye” to wobbly-wobbly iFlight XL7 v2 and say “hello” to 7-inch Source One! 6mm thick arms are the way to go!

How to setup INAV on a flying wing – video tutorial – GPS, Baro and Compass

  • Do you need a barometer on a flying wing with INAV?
  • Do you need a compass/magnetometer on a flying wing?
  • How to set up a GPS unit and which protocol should you use?
  • Do advanced tuning and set up a return to home, banking angles, landing procedures etc.
  • Configure the most important GPS related flight modes: PosHold, AltHold, and RTH
  • some extra tips and tricks like Galileo support for GPS

INAV and Failsafe – especially for FrSky owners (but not only)

  • You should not trust a guy on YouTube that says that he knows it all
  • OpenTX “no signal” is not the best failsafe setting when FrSky S.BUS devices are used and why
  • Than “Hold” failsafe setting might actually be a better option when S.BUS is used
  • How to setup Failsafe in INAV to have the best experience and safe flight

How to make 868MHz or 915MHz dipole antennas for FrSky R9 or TBS Crossfire receivers

The correct length of 868/915MHz antennas used by FrSky R9 and TBS Crossfire is:

  • for FCC 915MHz it is 75mm
  • for EU/LBT 868MHz it is 80mm

From time to time FrSky has a big problem with cutting their antennas to a correct length. Good thing, you can make your own TBS Crossfire RX antennas for cheap!

DSHOT sucks, at least in some specific cases

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 much does a propeller weight? Mass vs. moment of inertia

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

Where 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.