Futaba 9CPS - Manual (Page 88)

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 (9CH) or G (9CA) 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.
Time delay: A rudder offset time delay may be set up within the DELAY function (see p. 92) to ease in rudder and
prevent tail wag.
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%,
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.)
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:
88
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. (If a
slowed reaction is desired, go to DELAY.)
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. 90.
DELAY for THR-HOLD (to ease collective pitch response): see p. 92.
GYRO setup: see p. 95.
Setting up the Idle-Ups: Throttle and Collective pitch Curves and Revo. Mixing
(TH-CURVE, PIT-CURVE, REVO. MIXING) for idle-ups: see p. 90.
D/R,EXP: see p. 35.
is automatically activated with THR-HOLD.
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Switch assignment: Assigned to S WITCH G (9CH) or E (9CA) down.
Adjustable in the SW SELECT (T-HOLD item).
(2-position type switch only)