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EdgeTX Radio Setup

Setting up an EdgeTX model for a Rotorflight helicopter with an ExpressLRS link. (With an FrSky receiver, use the FrSky channel order from Radio & Lua instead.)

Template model

rotorflight-generic.yml is a ready-made EdgeTX model with the channels and switches below. Copy it to the SD card's MODELS folder and adapt it.

ExpressLRS module

Suggested ELRS settings for a helicopter:

Setting Value
Baud rate 5.25M, or as high as your module supports
Packet rate 500 Hz
Telemetry ratio 1:8 to 1:32 (1:4 is fine with ELRS 3.5.5+ if the link stays solid)
Switch mode Wide -- see the note below
Power 250 mW, dynamic

See the ExpressLRS switch configuration guide for what the switch modes do.

Wide switches and the throttle

In ExpressLRS's Hybrid and Wide switch modes, channels 6 and up are sent at reduced resolution. That's fine for switches, but the governor's NORMAL and SWITCH throttle types need a full-resolution throttle. Either use the governor's FUNCTION throttle type, which is made for switch channels (see Governor), or use one of ExpressLRS's Full Resolution switch modes.

Channels (ELRS order)

Channel Function Example control
1 Aileron (roll) Right stick
2 Elevator (pitch) Right stick
3 Collective Left stick, through a pitch curve
4 Rudder (yaw) Left stick
5 AUX 1 -- Arm SB, up = armed
6 Throttle SF throttle hold + SE flight mode
7 AUX 2 -- Profile switch SE
8 AUX 3 -- Rescue SH, momentary
9 AUX 4 -- Blackbox SA
10 AUX 5 -- spare SC
11-12 AUX 6-7 -- adjustments Pots or trims

Pick the ELRS preset on the Receiver tab.

Leave cyclic and rudder trims at zero, and set no mixes on the cyclic or tail -- the flight controller does all the mixing.

Telemetry

  1. Enable telemetry and custom telemetry on the flight controller -- see ELRS Custom Telemetry.
  2. With RFSuite, save its Telemetry page to select the sensors it needs.
  3. On the radio, Model → Telemetry: delete all sensors, start Discover new, and only then power up the helicopter.

Flight controller side