Manual

Helicopter(HELI) Section
45
Hovering Throttle Adjustment Knob
Hovering Pitch Adjustment Knob
The Hovering Throttle knob may be used to "tweak"
the throttle servo's position around hover without affecting
main rotor pitch. It's handy to make up for changes in
rotor speed caused by variations in temperature, humidity,
The Hovering Pitch
knob may be used to
trim the collective pitch
near hover without
affecting throttle. Like
hovering throttle, it's
handy to make up for
changes in rotor speed
caused by variations in
temperature, humidity, or
other conditions. You can adjust the hovering pitch value
simply by turning the Hovering pitch knob VR2. Like
hovering throttle, this knob only works near hover and
tapers off at either end of throttle. Please center this knob
before you set neutrals or input throttle curves.
reversed in front of the percentage value. Now the
swash should properly respond to collective. If you've
done the wrong thing, you can reset the percentage by
pressing the Active/Inhibit (Clear) key.
6. If all the servos tilt the swash to the right with right
aileron stick, go to the next step. If they tilt the swash to
the left, press the Cursor Right key once to get to the
aileron setting menu (the arrow appears over the
number 1). Reverse the sign in front of the percentage
with the Data -Decrease key. Now the swash should
properly respond to aileron.
7. (120' swash only) If all the servos tilt the swash back
with up elevator stick, go to the next step. If they tilt the
swash forwards, press the Cursor Right key once to get
to the elevator setting menu (the arrow appears over the
number 2). Now press the Data -Decrease key until the
sign is reversed in front of the percentage value. Now
the swash should properly respond to elevator. (In the
180' swash menu, there is no elevator setting, and this
step should be skipped.)
8. Double check that all three functions, collective,
aileron, and elevator, produce the desired result on the
swashplate.
or other conditions.
To change the hovering
throttle setting, simply
turn the Hovering throttle
knob VR1. As shown in
the figure, turning the
knob has the largest effect
in the hovering region and
leaves the endpoints alone.
Please center this knob
before you set neutrals or input
throttle curves.
High
Throttle Servo Response
Full
Pwr
Idle
Changing the
HV-T value
moves the
throttle response
above or below
the straight line
Low
Hover
Throttle Stick Motion
Changing the
Hovering Pitch
value moves the
pitch response
above or below
the straight line
High
Low
Hover
Throttle Stick Motion
Collective Pitch Servo Response
Max
Pitch
Min
Pitch
This procedure assumes helicopter is trimmed for hovering. Trimming must be done in near-calm conditions.
Repeat tests several times before making adjustments. If any changes are made, go back over the previous steps
and verify, or further adjust as necessary.
Helicopter Flight Trimming Chart
Adjusting Hovering Pitch and Hovering Throttle
RPM Stick Primary Corrective Action
High Below 1/2 Decrease hovering throttle
Low Below 1/2 Decrease hovering pitch
Perfect Below 1/2 Decrease hovering throttle, decrease hovering pitch
High 1/2 stick Increase hovering pitch, decrease hovering throttle
Low 1/2 stick Decrease hovering pitch, increase hovering throttle
Perfect 1/2 stick Don't touch a thing!
High Above 1/2 Increase hovering pitch
To test ...
1. RVMX mixing
- Up settings
(Part 1)
2. RVMX mixing
- Up settings
(Part 2)
3. RVMX Down
mixing settings
Observations
Observe rotation as helicopter
descends
A. No rotation
B. Model rotates counter-
clockwise
C. Model rotates clockwise
Observe rotation as helicopter
ascends
A. No rotation
B. Model rotates counter-
clockwise
C. Model rotates clockwise
Observe rotation as helicopter
ascends
A. No rotation
B. Model rotates clockwise
C. Model rotates counter-
clockwise
Adjustments
A. None
B. Add right rudder trim
C. Add left rudder trim
A. None
B. Increase UP RVMX mix
C. Decrease UP RVMX mix
A. No adjustment
B. Increase Down RVMX mix
C. Decrease Down RVMX mix
Test Procedure
Fly the model straight and level into
the wind at 100 ft altitude, lower
pitch to 0
Bring the helicopter into hover, add
full pitch and ascend 75 ft
Begin Down RVMX mixing with same
number as UP mix. From inverted
flight (top of loop, or mid-point of roll,
or inverted part of split-S), add full
negative pitch.
RPM Stick Primary Corrective Action
Low Above 1/2 Increase hovering throttle
Perfect Above 1/2 Increase hovering pitch, increase hovering
throttle
Want more Keep 1/2 Decrease hovering pitch, then increase
hovering throttle
Want less Keep 1/2 Increase hovering pitch, then decrease
hovering throttle