Futaba 8SGAP - Manual (Page 19)

•BASIC LINKAGES AND INSTALLATION
The FP-8SGAP has a servo reversing switch and ATV (Adjustable Travel Volume) for
each channel. Mount the servos without regard to their direction. Select and link servo
horns somewhat larger than those specified by the model manufacturer.
• Install the servos securely. Tighten the mounting
screws until the rubber grommets are slightly
compressed. Note: If the screws are too tight,
the vibration dampening effect of the grommets
will be lost.
• Use extension cords as needed.
• It is suggested that a separate servo be used on
each aileron as this will allow use of the versatile
mixing and differential functions built into the
transmitter. Retractable landing gear can be
operated with a single servo to save weight or
with two servos to simplify the mechanical link-
age as desired.
• Connect the pushrod to each servo horn, then
check to see if the direction of travel in relation
to stick movement is correct. If the direction of
travel is reversed, use the servo reversing switches
to correct.
• When installing the switch harness, cut a retangu-
lar hole slightly larger that the full stroke of the
ON/OFF switch and install the switch so that it
operates smoothly. It is best to install the switch
inside the fuselage and attach a piece of wire to
the switch so that it can be operated from out-
side the aircraft. Locate the switch where it will
not be exposed to engine oil, dust, etc.
•Wrap the receiver in soft foam rubber. Water-
and dustproof the receiver by placing it in a
plastic bag and tying the mouth of the bag with
a rubber band. Do the same with the airborne
battery pack. Caution: The foam rubber should
be loosely wrapped and not compressed. This
will provide maximum protection from vibra-
tion.
• Use the rubber bands wrapped around the re-
ceiver to hold the servo and switch leads.
• Even though the receiver antenna may appear to
be too long, do not shorten it or fold it back.
• Be alert for possible electrical noise.
This system has noise rejection circuits, however
noiseless parts are recommended.
•Operate each servo to its full throw and check
for slop or binding in the linkage. Unreasonable
force applied to the servo horns can damage the
servo or horns and will greatly shorten battery
life. Adjust linkages and servo horns so that the
servos move smoothly even when the trim lever
and stick are operated simultaneously in the
same direction.
• After installation is complete, recheck each part,
then perform a range check by collapsing the
transmitter antenna and extending the receiver
antenna to its full length. Operate the transmit-
ter at a distance of 60 to 90 feet from the receiv-
er. The servos should operate normally at this
distance.
Normal 8 channel use (mixing and other functions not used).
Set the switches on the trimmer panel at the back
of the transmitter as shown below. The switches
are set as shown in Fig. 29. Connect the aileron
servo to CH1, elevator servo to CH2, throttle servo to CH3, rudder servo to CH4, landing gear servo to
CH5, flap servo to CH6, spoiler servo to CH7, and
the pitch control servo to CH8.
Fig. 29
Set the DIFF
trimmer 1 5
to the INHB
(counterclock
wise).
DIFF trimmer 15 set to INHB Counterclockwise.
Note: Monitor Lamps (B), (C), and (D) do not
come on at this time. Check if the direction of
operation of each servo is correct under this state.
If the direction of operation of a servo is incorrect,
reverse the position of the corresponding servo
reversing switch [38] to [45]. Next, set the 2ND
ATV trimmers on aileron and elevator to the
desired
deflection angles on the aircraft. The
deflection angle decreases when the 2ND ATV
trimmer is turned counterclockwise. Throttle con-
trol can be adjusted with the ATL trim lever 19
This completes the settings for basic 8 channel
use.