FrSky sensors and Spirit Systems heli flybarless units

Spirit Systems produce awesome flybarless units for RC helicopter models. Per default Spirit units provide great support for OpenTX and FrSky gear. You can easily get telemetry from Spirit (also from connected ESC, like Hobbywing) and flawless OpenTX integration, which allows to set all Spirit parameters directly from FrSky radio (Horus or Taranis), using provided LUA script.

Things get a bit complicated if – in the same time – one would like to use standard FrSky telemetry sensors. In example if you connect FrSky GPS v2 sensor, it will collide with virtual telemetry sensors provided by Spirit flybarless unit, resulting in blocking telemetry signals from Spirit virtual sensors.

Fortunately there is simple workaround and in this article I will cover some of FrSky sensors, describing how I made them work with Spirit and standard Smart Port telemetry in FrSky / OpenTX.

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Swashplate Leveler for XLPower Specter 700

3D printed swashplate leveler. Handy tool to setup proper geometry of RC helicopter main rotor head.

This one will work with XLPower Specter 700, or any model helicopter with 15mm main shaft and similar swashplate diameter.

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MAK RC Signal Inverter

In RC hobby signal inversion may be required when connecting various components together, i.e. RC receivers to helicopter flybarless units or other flight controllers. This is particularly often required in case of one wire protocols, like SBUS, PPM or Smart Port – the last one being specific to FrSky products.

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OpenTX – nitro helicopter config (and much more)

OpenTX - nitro heli config (and much more)

The OpenTX offers almost unlimited possibilities for configuring RC models. This article covers a detailed and quite advanced OpenTX configuration for a nitro helicopter, operating under control of MSH Brain 2 flybarless unit.

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MAK RC Heli Servo Centering Tool

There are many servo testers and even some servo centering tools available on the market. I didn’t find though the one I wanted to have, with selectable 1500/1520µs PWM outputs and also with 760/960µs outputs for helicopter fast tail servos.

The MAK RC Heli Servo Centering Tool may be especially interesting for RC helicopter modellers, due to its fast tail servo PWM output. Of course Flybarless controller unit can be always used to center servos, but I like to mount FBL unit at very end, without bothering about it during the build process.

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