79
HELI
-SPECIFIC
ADVANCE
MENU FUNCTIONS
THR-HOLD
: This function holds the engine in the idling position and disengages it from the
THROTTLE STICK
when
SWITCH
AT10
is moved. It is commonly used to practice auto-rotation.
Prior to setting up
THR-HOLD
, hook up the throttle linkage so that the carburetor
is opened fully at high throttle, then use the digital trim to adjust the engine idle
position. To have
THR- HOLD
maintain idle, move the
THROTTLE STICK
to the
idle position, then move the hold SWITCH on and off and keep changing the
offset value until the servo does not move. To lower the engine idle speed, or if
you want to shut off, input a more negative number.
Adjustability:
•
Idling position:
Range of
-50%
to
+50%
centered about the throttle idle position to get the desired engine RPM.
•
Switch assignment:
Assigned to
SWITCH
E(AT10) or G
(
AT10
) down.
Adjustable in the
CONDITION
(
THR-HOLD
item).
(2-position type switch only)
•
Throttle curve:
Since the throttle is moved to a single preset position, no curve
is available for
THR-HOLD
.
•
Collective pitch curve:
Independent curve, typically adjusted to create a blade
pitch range of -4% to +10% to +12%, is automatically activated with
THR-
HOLD
.
•
Revo. mix:
Since revo. mix adjusts for torque from the engine, no revo. mix is available for
THR-HOLD
.
•
Priority:
The throttle hold function has priority over idle-up. Be sure that the throttle hold and idle-up
SWITCHES
are
in the desired positions before trying to start the engine. (We recommend starting your engine in throttle hold for safety
reasons.)
•
Gyro:
Gyro programming includes an option to have a separate gyro setting for each condition, including
THR-HOLD
.
This avoids the potential problem of the user being in the wrong gyro setting when going to
THR-HOLD
, resulting in an
improper rudder offset and the model pirouetting.
GOAL of EXAMPLE:
STEPS:
INPUTS:
Set up throttle hold.
Determine desired throttle position by
idling engine, turn on
THR-HOLD
, and
adjust percentage as required to reach
the desired running point.
Open
THR-HOLD
function.
for 1 second.
(If
BASIC
,
again.)
C
to
THR-HOLD
.
Activate the function.
C
to
MIX
.
to
OFF
.
Set desired engine position.
C
to
POSI
.
to desired percent.
Close.
Where next?
PIT-CURVE
for THR-HOLD: see p. 80.
DELAY
for
THR-HOLD
(to ease collective pitch response): see p. 82.
GYRO
setup: see p. 85.
Setting up the Idle-Ups: Throttle and Collective pitch Curves and Revo.
Mixing(
TH-CURVE, PIT-CURVE, REVO. MIX
) for idle-ups: see p. 80.
D/R
,
EXP
: see p. 30.
