Butterfly
The “Butterfly” function is available for models equipped with ailerons and flaps. The opposite deflection of the ailerons and flaps acts as an aerodynamic brake without affecting the flight direction. When activating the “Butterfly” aerodynamic brake, elevator compensation is often required, which is why elevator mixing is part of the “Butterfly” function setup.
Item Descriptions
Controller: Selects the control input for the “Butterfly” function (intensity of the aerodynamic brake). A suitable controller is a proportional input or a three-position switch.
Tip: Any transmitter control input can be used, or you can assign a function from the menu using the F1 (+) button.
Offset: Sets the offset (dead zone, within which the “Butterfly” function does not respond to changes in the control input) for the selected controller or function from the “Select control input” menu.
Delay: Sets the time it takes for the aerodynamic brake to reach the desired position. A positive value is the time needed for full deployment of the aerodynamic brake; a negative value is the time needed for deactivation of the “Butterfly” function.
Mode: When set to “G”, the configuration applies to all flight modes of the model. When set to “S”, it applies only to the currently active flight mode.
Aileron/Flap Settings
Tip: The number of displayed and editable columns S1 to S4 depends on the selected wing type in the “Basic Properties” menu.
Ailerons: Sets the maximum aileron deflection values for the “Butterfly” function. Positive values indicate upward deflection, negative values indicate downward deflection.
Tip: Values in parentheses show the currently valid deflections of each control surface after adjustments in the “Tuning” menu.
Diff. Adjustment: If aileron differential is used, this option allows you to modify the differential values when the “Butterfly” function is active.
Flaps: Sets the maximum flap deflection values for the “Butterfly” function.
G or S Symbol: When set to “G”, the values configured in this menu apply to all flight modes of the model. When set to “S”, the values apply only to the currently active flight mode.
F1 Button (Sym.): Use this toggle to switch between linked or independent adjustment of values in a row.
Elevator Settings: When the aerodynamic brake (Butterfly) is activated, elevator compensation is usually required. This menu allows you to set the amount and curve of elevator deflection for the “Butterfly” function across its entire range.
Tip: The default position for ailerons and flaps in the Butterfly function is their center (neutral) position. Therefore, the elevator curve should typically also begin at a neutral value.
Tuning: This menu allows fine-tuning of all Butterfly deflections using a single proportional control input during flight. Corrections made with the selected control are added to or subtracted from the values previously set for ailerons, flaps, and elevator.
F3 Button (Apply): Activating the Tuning menu (by assigning a control and entering values other than 0) also enables the F3 (Apply) button in this menu, as well as in the Elevator Settings and Aileron/Flap Settings menus.
By pressing this button, all currently active values—including control positions—are written into the aileron, flap, and elevator settings. The values in the Tuning menu are automatically reset to zero, and the control input will have no effect until new values are entered.
Free Mixes
Menu for activation and tuning of up to 30 freely configurable mixes (depending on transmitter type).
From (Master): Defines the primary (controlling) function.
To (Slave): Defines the function that will be affected by the mix (controlled).
Value: Sets the amount by which the Master function influences the Slave function.
Tip: If Value = 0, the mix is inactive. Negative values reverse the direction of the mix influence.
G or S Symbol: When set to “G”, the values configured in this menu apply to all flight modes of the model. When set to “S”, the values apply only to the currently active flight mode.
Copy: Press F1 (Copy) to duplicate the selected mix. The copy is added to the end of the mix list.
+: Press F2 (+) to create a new mix.
x: Press F3 (x) to delete the selected mix.
Edit: Press F4 (Edit) for detailed editing of the selected mix.
Detailed Mix Settings:
The first line of the menu displays the names of the (From) Master and the (To) Slave functions involved in the mix.
G Symbol: Values set in this menu apply to all flight modes of the model.
S Symbol: Values apply only to the currently active flight mode.
Main Value: Sets the intensity with which the (From) Master function affects the (To) Slave function. If set to 0, the mix is inactive. Negative values reverse the direction of the mix influence. The actual current value of the mix is shown in parentheses. If the mix is disabled (its Switch is set to x), the value in parentheses will be 0.
Switch: Assigns a control input that can enable or disable the given mix.
Tip: If no Switch is assigned, the mix will always be active.
Curve: By default, the mix behavior relative to the Master function is linear, with intensity set by the Main Value parameter. In the Curve menu, you can define a custom mix curve, including setting different intensities for each half of the control range.
Example Use of a Mix Curve:
The model is equipped with retractable landing gear and a steerable nose wheel. A mix is active where the rudder is the Master and the nose wheel steering servo is the Slave.
In the flight mode with landing gear extended, the nose wheel steering servo uses a “3-point” curve with adjusted endpoints to reduce deflection (see diagram). This way, the nose wheel is controlled by the same input as the rudder, but with reduced travel.
In the flight mode with landing gear retracted, the nose wheel servo uses a “Constant” curve, shifted so that the nose wheel is locked in an optimal fixed position for safe retraction and deployment. With the “Constant” curve, the wheel remains immobile and locked in the set position.
Using the “Delay” function (see below), the activation timing of both curves can be set so that the wheel is locked in position before retraction, and nose wheel steering is re-enabled only after the gear is fully extended.
Delay +Source-:
Allows you to set a gradual activation of the mix function after movement of the Master control. Different delay values can be set for both directions of movement.
Example use case:
When flying level at different engine power levels, elevator compensation is required, but engine acceleration and the model’s response to elevator input differ.
By mixing Throttle (Master) with Elevator (Slave) and adjusting the Delay, you can fine-tune elevator compensation during throttle changes.
Delay +Switch-:
Allows you to set a gradual transition time between activation and deactivation of the mix. Separate delay values can be assigned for each direction of switching.
Mix Output:
This option appears only if the mix has more than one output (e.g., four outputs for four ailerons).
A different mix intensity can be set for each output (S1–S4).
Throttle Asymmetric Mix:
Selects the behavior of mixes for asymmetric functions without a neutral position (e.g., throttle), or symmetric functions with a neutral control position (e.g., rudder).
Unidirectional:
If a function consists of multiple outputs (e.g., dual ailerons), it is necessary to define whether the mix should add or subtract values.
Enable unidirectional mixing for parallel control surfaces, such as dual elevators, flaps, or airbrakes.
Disable unidirectional mixing for opposing functions, such as aileron pairs.
Master Link, Slave Link:
Useful in advanced programming, these options allow a mix to be used as an input value for other free mixes — effectively mixing mixes into other mixes.
Trim:
Enables the Master function’s trim to also affect the Slave.
Example:
If a mix is controlling multiple servos for a single function — e.g., dual servos for elevator halves — and Trim is disabled, only one half of the elevator will respond to trim adjustments.
When Trim is enabled, both elevator halves will respond to trim adjustments together.
Slave Dual-Rate:
If the Slave function in a mix has Dual Rate (reduced/exaggerated control deflection) or Expo (exponential control response) enabled, this setting allows you to enable or disable the application of Dual Rate and Expo to the Slave function within the mix.
Aileron Differential:
Note: This option is only displayed if the mix involves Ailerons as the Master function and any other function as the Slave.
If enabled, the aileron differential settings (see the “Differential” menu) will be applied to the slave functions affected by the mix.
Bottom Bar Button Descriptions:
F2: Opens a graphical display of the current servo deflections, shown in percent, milliseconds, or as a curve.
F4: Direct access to the mix curve setup menu.
F5: Confirms the entered values and returns to the “Free Mixes” list.