Futaba 7C 2.4GHz - Manual (Page 67)

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. 68.
GYRO setup: see p. 73.
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. 33.