+ 100%
Heading
Hold
10%
gain
Normal
- 100%
SENSITIVITY (GAIN) SETTING
A
s usual, set the gyro gain as high as possible, at which point the tail does not yet tend to oscillate, not even at high flight speed. The
tendency to oscillate, and thus the holding force, mainly depends on the speed of the tail servo, but also on a mechanism free of play,
with an easy moving linkage, as well as an optimum drive (without belt slipping, or breakdown of the motor controller at full coll.pitch,
etc.). You can additionally optimize the gyro‘s performance to the model by tuning further parameters of the TAIL menu. In the case of
high-performance acro helicopters, the following tuning procedure has proven successful:
P-GAIN
Search for the setting at which the tendency to oscillation is at its lowest (referred to the same tail gain),
and you may then further increase the overall gain to some extent.
•
You prevent fast oscillations (fine dithering) by a lower tail gain.
•
You prevent slow oscillations (wag) and bouncing back by a higher P gain.
LOCK-IN DELAY
Use this parameter to optimize the lock-in behavior when the stick is released quickly, with the result that the tail stops without boun-
cing back or overshooting. Before adjusting the delay, adjust the tail gyro gain to the highest possible value.
REVO MIX
Improve tail stability (particularly with slower tail servo) by generating a direct anticipated correction for the tail with every torque
change caused by increasing coll.pitch, even before any measurable drift occurs, which the gyro would have to first detect in order
to counter-act.
For Revo mix you can select:
•
for 3D-flying
symmetrical pitch curve
•
for scale flying, with coll.pitch hover position at stick center
asymmetrical coll.pitch curve
Optimize Revo mix with reduced gyro sensitivity as an initial test: give sharp coll.pitch inputs and see what the tail does. If it can’t hold the
increasing torque, i.e. moves in the opposite direction to the main rotor rotation, then increase the Revo mix amount. After finding the best
setting, increase the gyro gain again.
OPTIMIZING THE ESC
If the tail moves clearly after a coll.pitch change, the source mostly is a sluggish responding motor controller that does not allow to
keep the rpm up at maximum torque and accelerates too late, thus applying a high load to the tail. In this case, generally, an impro-
vement is achieved by increasing the overall rpm.
TAIL GYRO CHANNEL
HEAD GYRO CHANNEL
+ 100%
0%
1,5 ms
- 100%
100%
RIGID
20%
gain
RIGID
100%
100%
ON
0%
HOR OFF
100%
HOR +
Coll.Pitch
Act.
RIGID-MODE
HOR-MODE
9
TAIL GYRO OPTIMIZATION
9
