HELI-SPECIFIC
ADVANCE
MENU FUNCTIONS
THR-HOLD
:
This function holds the engine in the idling position and disengages it from the
T
HROTTLE
S
TICK
when
S
WITCH
E
(7CH) or
G
(7CA) 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
T
HROTTLE
S
TICK
to the idle
position, then move the hold
S
WITCH
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.
Rudder offset
: Offsets the tail rotor pitch. Keeps the fuselage from rotating in throttle hold.
Switch assignment
: Assigned to
S
WITCH
G
(7CA) or
E
(7CH) down. Not adjustable.
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 +6
°
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
S
WITCHES
are in the
desired positions before trying to start the engine. (We recommend starting your engine in throttle hold for safety reasons.)
GOAL of EXAMPLE:
STEPS:
INPUTS:
67
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.
Where next?
Open
THR-HOLD
function.
Activate the function.
Set desired engine position.
Optional: set up a rudder offset.
Close.
for 1 second.
(If
basic
,
again.)
to
THR-HOLD.
to
OFF.
to desired percent.
to
OFF
.
to desired offset.
PIT-CURVE
for
THR-HOLD
: see p. 69.
GYRO
setup: see p. 72.
Setting up the Idle-Ups: Throttle and Collective pitch Curves and Revo. Mixing
(
TH-CURVE, PIT-CURVE, REVO. MIXING)
for idle-ups: see p. 69.
D/R,EXP
: see p. 34.
