User's Manual

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Dual Rate / Expo - ﬁ xed-wing model

D/R Expo

Switchable control characteristics for aileron, elevator and rudder

Use the arrow buttons of the left or right-hand four-way

button to leaf through to the “D/R Expo” menu point of

the multi-function menu:

mod. mem.

servo set.

D/R expo

wing mixer

base sett.

contr set.

phase trim

free mixer

servo disp basic sett

fail-safe

telemetry

A press on the central SET button of the right-hand four-

way button opens this menu point:

100%

aile

elev

rudd

DUAL EXPO

–––

The Dual Rate / Expo function provides a means of

witching to reduced control travels, and of inﬂ uencing

the travel characteristics, for aileron, elevator and rudder

(control functions 2 ... 4).

Dual Rate works in a similar way to transmitter control

travel adjustment in the “Transmitter control settings”

menu, i. e. it affects the corresponding stick function, re-

gardless of whether that function controls a single servo

or multiple servos via any number of complex mixer and

coupling functions.

For each switch position the servo travels can be set to

any value within the range 0 to 125% of full travel.

Expo works in a different way. If you set a value greater

than 0%, exponential provides ﬁ ne control of the model

around the centre position of the primary control func-

tions (aileron, elevator and rudder), without forfeiting

full travel at the end-points of stick movement. If you set

a value lower than 0%, travel is increased around the

neutral position, and diminishes towards the extremes of

travel. The degree of “progression” can therefore be set

to any value within the range -100% to +100%, where

0% equates to normal, linear control characteristics.

Another application for exponential is to improve the

linearity of rotary-output servos, which are the standard

nowadays. With a rotary servo the movement of the

control surface is inevitably non-linear, as the linear

movement of the output disc or lever diminishes pro-

gressively as the angular movement increases, i. e. the

rate of travel of the control surface declines steadily

towards the extremes, dependent upon the position of

the linkage point on the output disc or lever. You can

compensate for this effect by setting an Expo value

greater than 0%, with the result that the angular travel of

the output device increases disproportionately as stick

travel increases.

Like Dual Rates, the Expo setting applies directly to the

corresponding stick function, regardless of whether that

function controls a single servo or multiple servos via

any number of complex mixer and coupling functions.

The Dual Rate and Expo functions can be switched on

and off together if you assign a switch to the function.

The result of this is that Dual Rates and Expo can be

controlled simultaneously using a single switch, and

this can be advantageous - especially with high-speed

models.

Flight phase dependent Dual-Rate and Expo set-

tings

If you have assigned a switch and - if you wish - a more

appropriate name to one of the phases 2 and 3 in the

“Base settings” menu (see page 60), then this appears

at bottom left, e. g. “normal”. If necessary, operate the

associated switch in order to switch between the ﬂ ight

phases.

The basic set-up procedure

Switch to the desired ﬂ ight phase, and then select 1.

the desired line “aile”, “elev” or “rudd” using the arrow

buttons cd of the left or right-hand four-way button.

If necessary, use the 2. ef buttons of the left or right-

hand four-way button to select the desired column.

Press the central 3. SET button of the right-hand four-

ay button: the corresponding input ﬁ eld is now high-

lighted (black background).

Set the desired value using the arrow buttons of the 4.

right-hand four-way button.

Press the central 5. SET button of the right-hand four-

ay button to conclude the input process.

Simultaneously press the 6. cd or ef buttons of

the right-hand four-way button (CLEAR) to reset any

changed settings to the default values.

Dual Rate function

If you wish to switch between two possible D/R set-

tings, use the f button of the left or right-hand four-way

button to move to the right-hand column, marked at the

bottom edge of the screen with the switch symbol

then press the central SET button …

100%

aile

DUAL EXPO

–––

normal

push desired switch

into position ON

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