Futaba 8J User Manual
Page 81
80
THR-HOLD
: This function holds the engine in the idling position and disengages it from the THROTTLE STICK when
SWITCH E -+ RU * -$ LV PRYHG ,W LV FRPPRQO\ XVHG WR SUDFWLFH DXWRURWDWLRQ
Prior to setting up THR-HOLD KRRN XS WKH WKURWWOH OLQNDJH VR WKDW WKH FDUEXUHWRU
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
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the offset value until the servo does not move. To lower the engine idle speed,
or if you want to shut the engine off, input a higher negative number.
Adjustability:
,GOLQJ SRVLWLRQ Range of -50% to +50% centered about the throttle idle position to get the desired engine RPM.
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Adjustable in the CONDITION SELECT (THR-HOLD item).
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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
SLWFK UDQJH RI to +10 to +12 , is automatically activated with THR-HOLD.
5HYR PL[ Since revo. mix adjusts for torque from the engine, no revo. mix is
available for THR-HOLD.
Priority: 7KH WKURWWOH KROG IXQFWLRQ KDV SULRULW\ RYHU LGOHXS %H VXUH WKDW WKH WKURWWOH KROG DQG LGOHXS SWITCHES are
in the desired positions before trying to start the engine. (We recommend starting your engine in throttle hold for safety
reasons.)
*\UR 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 of
the idling engine, turn on THR-HOLD, and
adjust percentage as required to reach
the desired running point.
Open THR-HOLD function.
for 1 second.
to THR-HOLD.
Activate the function.
to MIX.
to OFF.
Set desired engine position.
to RATE.
to desired percent.
Close.
Where next?
PIT-CURVE
IRU 7+5+2/' VHH S
DELAY
for THR-HOLD (to ease collective pitch response): see p. 84.
GYRO
setup: see p. 87.
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Mixing(TH-CURVE, PIT-CURVE, REVO. MIX IRU LGOHXSV VHH S
D/R
,EXP: see p. 39.