+ 110% (JR)
-90 (Futaba)
0%
1,5 ms
-110 % (JR)
+90 (Futaba)
100%
RIGID
20%
gain
RIGID
100%
100%
HOR ON
0%
HOR OFF
100%
HOR +
C.pitch Act.
ON
100%
Heading
Hold
10%
gain
Normal
100%
RIGID-MODE
HOR-MODE
TAIL GYRO OPTIMISATION
SENSITIVITY (GAIN) SETTING
As usual, set the gyro gain as high as possible, at which the tail does not yet tend to oscillate, not even at high fl ight speed. The tendency to oscillate and thus
the holding force crucially depend on the speed of the tail servo, but also on a play-free and easy-moving linkage as well as an optimum drive (no belt slipping,
no breakdown of the motor controller at full coll.pitch, etc.).
You can additionally optimise the gyro‘s performance to the model by tuning further parameters of the [Tail gyro] menu. In the case of high-performance acro
helicopters, the following tuning procedure has proven itself and excellent performance can be achieved with it, even under extreme loads.
P-GAIN AND D-GAIN
Search for the setting at which the tendency to oscillate is at its lowest (referred to the same overall rigid gain), and you may then further increase the overall
gain to some extent.
• You prevent fast oscillations (fi ne dithering) by means of a lower D-gain.
• You prevent medium-speed oscillations by a higher D-gain or by a lower P-gain.
• You prevent slow oscillations and bouncing back by means of a higher P-gain.
DELAY
Use this to optimise the locking-in when the stick is released suddenly, with the result that the tail stands still without bouncing back or overshoot. Before adjus-
ting the delay, adjust the tail gyro gain to a good and high value.
REVO-MIX
To improve tail stability (particularly with slower tail servos) by generating a direct ahead correction for the tail with every load change caused by coll.pitch eleva-
tions, even before measurable drift occurs, which the gyro would have to fi rst detect in order to balance it out.
For the Revo-mix you can select:
• for 3D-fl ying → symmetrical pitch curve
• For scale fl ying, with coll.pitch hover position in stick centre → asymmetrical pitch curve
Optimise Revo mix with reduced gyro sensitivity as a test measure: Issue sharp coll.pitch defl ections and observe the tail. If the
tail gives in to the torque at the start of ascent, i.e. swivels in the opposite direction to the main rotor, then increase the Revo amount. Finally raise the gyro
sensitivity again.
OPTIMISING THE ESC
If the tail performs a tiny excursion only after a coll.pitch change, the cause of this is mostly a sluggishly responding motor controller that allows the motor speed
to break down briefl y at the maximum load and then accelerates, thus applying a high load to the tail. In this case, mostly an improvement is achieved by increa-
sing the motor‘s speed.
TAIL GYRO CHANNEL
HEAD GYRO CHANNEL
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