GRAUPNER mc-16 Programming Manual page 192

The gyro suppression function reduces gyro gain in a
linear progression as the pilot increases the tail rotor
deflection. Without gyro suppression – i. e. when set to
0 % – the gyro effect is constant, regardless of the stick
position.
With a transmitter control assigned on the "Gyro" line
on the »Control adjust« menu, page 120, e. g. one
of the proportional sliders mounted in the middle con-
sole; as applicable, also made flight-phase depend-
ent and/or with infinitely variable gyro effect between
minimum and maximum. In this case, gyro gain is
maximum at full deflection of the slider, and zero at the
opposite end-point.
Of course, the software lets you limit the gyro gain
range on both sides by altering the transmitter con-
trol travel.
Depending on the transmitter control's position, the
gyro gain at full travel on the tail rotor stick is:
"current control position
minus
gyro suppression value".
Accordingly, if the transmitter control is at the neutral
point, and gyro suppression is set to 100 %, the gyro
gain is reduced to zero as the tail rotor deflection in-
creases. For values between 100 % and the maximum
value of 199 %, the gyro can be fully suppressed – de-
pending on the transmitter control position – well before
full deflection of the tail rotor; see the diagram on the
next page.
For the Graupner gyro NEJ-120 BB, No. 3277, both
the upper and the lower values are set via rotary con-
trols: control 1 sets the minimum gyro gain at the bot-
tom position of the slider; control 2 sets the maximum
gain at the top end-point of the slider; the transition
between these two values occurs roughly in the middle
of the slider travel.
192 Program description - Helicopter mixer
In contrast, the PIEZO 900, PIEZO 2000 and PI-
EZO 3000 gyro systems feature proportional, infinitely
variable adjustment of gyro gain; see below for typical
diagrams.
As an example, the option to configure flight phase-
specific – and static – gyro gain gives you the opportu-
nity to exploit maximum stabilization for normal, slow
flying, but to reduce gyro gain for fast circuits and
aerobatics.
Samples of various gyro settings and configuration
• Linear gyro suppression: 0 % to 199 %.
With the tail rotor stick in the centre position,
the resulting gyro effect is set using the select-
ed transmitter control. Using a proportional rotary
control or slider, the effect is infinitely variable be-
tween zero ("min") and maximum ("max"), provid-
ed transmitter control travel is not restricted. With
full tail rotor deflection, the effective gyro gain is
as follows:
"current control position
minus
gyro suppression value".
This means that at 0 % gyro suppression, gyro
gain is constant for tail rotor stick movement; at
50 % suppression, gyro gain is reduced to half
if the assigned transmitter control is moved to
the +50 % position (as shown here); and only at
>150 % suppression is gain reduced to zero with
the slider at this position, well before full tail rotor
deflection.
Exemple:
+50 %
left centre
Stick deflection tail rotor
• Linear gyro suppression with reduced control trav-
el, e. g. -50 % to +80 % of full travel.
Gyro gain is infinitely variable within these trans-
mitter control limits. Here too, for purposes of il-
lustration, we plot gyro gain values in relation to
tail rotor deflection for various parameter values of
gyro suppression.
Exemple:
+80 %
left centre
Stick deflection tail rotor
Adjusting the gyro sensor
To achieve the maximum possible level of stabilization
for the helicopter with the gyro along the vertical axis,
observe the following:
• The controls should have as little friction and "play"
as possible.
• There should be no "spring" in the control linkage.
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