Checking the gyro function in flight
a) Operation in normal mode
• Switch on the transmitter in normal mode with 75% gyro sensitivity and switch on the receiver on the
model helicopter. The control stick for the tail function and the associated trim lever must first be put into
centre position.
• The control LED goes out after initialisation.
• Allow the helicopter to carefully take off and correct the turn of the tail with the tail rotor trim.
• After landing, adjust the tail rotor control rods so that the tail reliably keeps its position in flight and the
trim on the transmitter is back in centre position.
b) Switching from normal mode to AVCS mode
• Once you have made all settings in normal mode, you can switch to AVCS mode using the gyro sensitivity
settings regulator. Please note that gyro sensitivity is required to be a little lower in AVCS mode than in
normal mode.
Caution!
If the LED flashes twice rhythmically on the gyro after switching to AVCS mode, the previously
determined neutral position in normal mode is not identical with the saved neutral position in
AVCS mode.
In this case, switch off the receiver and switch it back on after a short while. The LED must be
lit continuously.
Important:
Please note that the correct neutral point setting must be checked for all flight states (hovering
flight, sightseeing flight, artistic flight).
• When the helicopter hovers properly in normal and in AVCS mode, you can adjust the accustomed
control response of the tail function via the "dual rate" or the "exponential function" on the transmitter.
Optimising the gyro function
Once you have performed a number of test flights with your model helicopter and have roughly adjusted
the gyro, you can optimise the gyro settings.
To this end, operate the gyro in AVCS mode at 100% gyro sensitivity and perform the test flights with the
same rotor head rotation speed at which you will fly later.
a) Determining maximum gyro sensitivity
First fly your model helicopter forward as fast as possible. Then slightly deflect the control stick for the tail
function and let go of it suddenly so that it bounces around centre position.
If the tail straightens out without swinging up, gyro sensitivity can be increased. However, if the tail swings
up further, sensitivity is too high. The best sensitivity is achieved when the tail is just about to swing up.
Please note:
The maximum adjustable gyro sensitivity depends on the rotation speed of the main rotor.
The higher the set main rotor speed, the lower the maximum flyable gyro sensitivity.
b) Determining optimal servo lever length
The length of the tail servo lever (see illustration 3, position A) is directly linked to the maximum possible
gyro sensitivity.
If the servo lever is too long, the maximum possible gyro sensitivity is too low.
If the servo lever is too short, the maximum possible gyro sensitivity is too high.
If gyro sensitivity is below 70%, the servo lever should be shortened or the control rod should be installed
further to the inside of the servo lever.
If gyro sensitivity is above 100%, the servo lever should be extended or the control rod should be installed
further to the outside of the servo lever.
Caution!
Once you have adjusted the length of the rear servo lever, the maximum possible servo route
must be readjusted via the "LIMIT" control dial (see illustration 11, pos. 18). Otherwise there
is a risk that the tail servo is damaged by overload.
c) Determining optimal vertical axis rotation speed
Fly a 540-degree turn with your model helicopter pushing the tail rotor control stick all the way.
How fast the model rotates around the vertical axis solely depends on the ATV value (transmitter settings
menu for maximum servo throw). If needed, you can decrease or increase this value via the "dual rate" or
the "exponential function" to adjust it to your individual control habits.
d) Adjusting the delay time
With the "DELAY" control dial, you can ideally adjust the gyro to the
response time of the used servo in AVCS mode. If you are using a
high-speed digital servo, you can leave the set value at 0 (control dial
all the way to the left). If you are using a slower analogue servo, a
correction may be required.
If the model helicopter does not immediately stop turning after
performing a pirouette, increase the delay time via the "DELAY"
control dial (19) using the small adjustment screwdriver (see illustration
1, pos. 6).
Make only small changes and perform test flights to check the effect.
MC 800
DELAY
LIMIT
OFF
ON
NOR
REV
DIR
DS
0
25
50
75
100
60
80
100
120
140
GYRO
AVCS
-
19
Figure 12
Maintenance and care
The exterior of the gyro may be cleaned with a soft, dry cloth only. Never use aggressive cleaning agents
or chemical solutions as these may damage the surfaces.
Disposal
At the end of its service life, dispose of the product according to the relevant statutory
regulations.
Specifications
Operating voltage: ......................... 4.8 - 6.0 V/DC
Current consumption: .................... approx. 80 mA
Connector system: ......................... Futaba
Temperature range: ....................... -10 °C to +45 °C
Dimensions: ................................... 28 x 28 x 20 mm
Weight incl. connection cable: ...... 24 g
These operating instructions are a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1,
D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in
technology and equipment reserved.
© Copyright 2009 by Conrad Electronic SE.
