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
Another small device on my workbench: RunCam Mini DVR. Just like a name says: it's a DVR and it's small. You install it somewhere between your FPV camera and VTX, put a micro SD card, press a button and it will start recording. The simple solution to a simple problem. Of course only as long as your problem is lack of DVR in your FPV goggles…
kill a LiPo. When the battery is close to its death and should be disposed of, you can not just throw it away. It still has some electric charge inside and can catch fire when not handled properly. Discharge with a low current will drain the battery to 0 in a safe way
Discharge it to the desired level. For example for storage. You plug the balancing lead, select cutoff voltage with a button and leave it for a night. Built-in microcontroller (STM32F103, the same that is in Naze32 or CC3D) will measure voltages and stop the discharge when voltage will drop to the level you want
Who could have imagined that tricopters can be so much fun? For sure they are interesting devices that lost a lot of "market" when quadcopters gained extra torque and plenty of reaction moment to do fast yaw turns. Almost no one flies them now. Too bad… And good luck if you want to buy a tricopter frame for 5-6 inch propellers. There is almost nothing on the market right now!
Luckily, we are living in interesting times, and everyone with few hundred dollars can get a 3D printer and make whatever he wants (right, if it was that simple…). Thanks to this, I give you a 3D printed tricopter frame designed to use miniquad parts: 2205 motors, 5 inch propellers and 9 gram servo:
FrSky R9 radio system is storming the RC hobby. It's super cheap after all. But there are problems: EU version is facing a lot of problems and people like to replace original antennas with something else.
Last week I was asked to check what is going on with antennas shipped with FrSky R9 Mini. After all, the same hardware can be used both for FCC 915MHz and EU 868MHz version. Is the antenna tuned somewhere in between? Or not so much?
220x motors are the workhorse on the RC hobby right now when it comes down to mini quads. Sometimes they are joined by 230x too. But 2205 and 2206 brushless outrunners have a serious problem that limits their use with propellers bigger than 5 inches. They might still be fine with 6-inch props, but on 7-inches problems begins. What 220x lack is torque! They are just too small to have enough copper wire and diameter to deliver enough torque to drive much heavier 7-inch propellers.
Is Matek F722-SE the best flight controller of 2018? Perhaps it's "slightly" too early for such statements, but for sure, it looks like one of the strongest pretenders for such a title (if the title existed).
In a meantime, a video showing brand new Matek F722-SE flight controller and most of its features.