Radiolink Electronic Ltd
53
THROTTLE-NEEDLE is a pre-programmed mix that automatically moves an in-flight mixture servo
(CH8) in response to the THROTTLE STICK inputs for perfect engine turning at all throttle settings.
This function is particularly popular with contest pilots who fly in a large variety of locations, needing
regular engine tuning adjustments, and requiring perfect engine response at all times and in all
maneuvers. Also popular to minimize flooding at idle of inverted engine installations or installations
with a high tank position. Not needed for fuel injection engines, which do this automatically.
ADJUSTABILITY:
• Five-point curve allows adjustment of engine mixture at varied throttle settings.
• The in-flight mixture servo must connect to receiver CH8.
• In-flight mixture servo may also be used as a second servo for tuning a twin.
• Throttle cut feature also moves the in flight needle servo.
• The CH8 knob adjusts the high throttle mixture (may be deactivated. see AUX-CH).
• Because both use CH8, this function cannot be used simultaneously with AILEVATOR.
• An acceleration (ACCE) function (ACRO only) helps the engine compensate for sudden, large
amounts of throttle input by making the mixture suddenly richer, then easing it back to the proper
adjustment for that throttle setting. This function requires some adjustment to best fit your engine
and your flying style. Adjust engine's response until no hesitation occurs on rapid throttle input.
• Separate curves are available (HELI only) for normal, idle-ups 1 and 2 combined, and idle-up 3.
Immediately below MIX the radio displays the curve you are editing; ex: >NORML; and then which
condition is currently active by your switches ex: (ID1/2). Note that you can edit the mix for a
different condition without being in that condition, to allow editing without having to shut off the
helicopter’s engine every time. Be sure you are editing the proper curve by checking the name after
the > and not the one in parentheses.
Goals
Steps
Inputs
Activate
THROTTLE-
NEEDLE
mixing.
Adjusting the
points as
follows: to
resolve a slight
lean midrange
problem:
1
：
40%
2
：
45%
3
：
65%
4
：
55%
5
：
40%
Open THROTTLE-NEEDLE
to BASIC .
again to ADVANCE
to THR-NEEDLE,
Activate the function.
to MIX.PUSH
to ON.
HELI only. Select the condition
to edit.
to COND.PUSH.
as needed.
Adjust the travels as needed to
match your engine by slowly
moving the stick to each 5 points,
then adjusting the percentage at
that point until the engine is
properly tuned.
to PIONT.
Throttle Stick to P
1
，
to40%
，
Throttle Stick to P
2
，
to 45%
，
Throttle Stick to
P 3
，
to 65%
，
Throttle Stick to
P 4
，
to55% ,
Throttle Stick to
P 5
，
to 40%,
ACRO only . Optional: increase
mixture when throttle is applied
rapidly-ACCE.(see above for
details)
to ACCE. Push
Throttle Stick to idle
Throttle Stick to full open quickly.
Heli only: set curves for another
conditions.
to condition name
to next condition name to
edit.
Repeat above steps as needed.
Close
