F3F template (OTX version) controlling a Baudis Pitbull 2. La Muela, Spain.

F3F - Pro template for slope soarers

F3F is specially designed for slope soarers with six servos. The template is closely based on the well-proven OpenTX version, and is suitable for both sport and competition flyers.

Version 2.1 features a powerful crow-aware elevator trim system - previously this was only available via a Lua script for OpenTX, but thanks some cool features in Ethos 1.5, it can now be implemented natively.

Key features:

Also included is a special 'CAL' mode for precise matching of control surface travels.

X20 transmitter

Control layout showing flight mode switches and mix adjusters. Layout is customisable.



For 6-servo slope soarers

V-, T- or X-tail

Any stick mode

Flight modes

Normal/Reflex, Climb, Landing

Pump mode (optional)

Voice confirmation

Trimming adjusters

Adjuster for aileron diff

Adjuster for camber

Adjuster for snapflap volume

Adjuster for snapflap expo

Crow functions

Crow-aware trim

Aileron diff suppression

Reverse diff

'Autocrow' option

Adjustable deadband on crow stick


Customisable switch layout

'CAL' mode

Full travel on flap servos


v2.1.0 (for Ethos 1.5.6 or later)

Based on v1.1.0, but optimised for Ethos 1.5 and with addition of crow-aware trim

v1.1.0 (for Ethos 1.3.3 or later)

Please see support page if using with Ethos 1.5


Marco Sanna for Italian guide and sounds
Michel for French sounds
Benoît Paillard for French translation
Matthias Jokisch for German translation
Version history


Blog: designing a transmitter setup for F3F


Feedback and queries are always welcome - I can be contacted here.