FMA Direct
– 7 –
T-80RF user’s guide
C. Set the control throws.
Control throw
refers to how far an airplane’s control surfaces
move in response to the maximum movement of the corre-
sponding control stick on the transmitter. You must set control
throws with the T-80RF’s tri-rate at 100%.
1. Install the servos, linkages, receiver, switch harness and
receiver battery in the aircraft according to instructions
supplied with those items. (If you purchased an FMA flight
pack, refer to the manual supplied with it.)
2. Be sure the servos are connected to the receiver as follows:
3. Locate the
50%
and
75%
switches in the
Functions
section
on the T-80RF front panel.
4. Using a very small flat-blade screwdriver, move the
50%
and
75%
switches to the down (off) position. This sets the
tri-rate feature to
100%
so you can initially set up the
control surfaces.
5. Set all four transmitter trims to their centered positions.
6. Turn on the transmitter, then turn on the receiver.
7. With the transmitter control sticks centered, make sure that
the control surfaces are in their neutral positions. If a
control is offset from neutral, adjust the appropriate linkage.
8. Set each control surface to the amount of travel
recommended by the airplane’s manufacturer. Do this by
changing the location of the clevis in the servo arm and/or
control horn holes.
Example:
If the manufacturer specifies a 1/2" control throw
for the elevator, then the elevator trailing edge should move
1/2" up or down from its neutral position when you move
the transmitter’s elevator stick all the way up or all the way
down.
9. Using the table below, set the tri-rate to match your skill
level. If you are a beginner, ask your instructor for advice
(the instructor may want to test the aircraft at 100%, then
select a different setting before letting you control the
Setting up the radio system — continued
Note
: At this point, don’t use the transmitter trims to
set control surfaces to their neutral positions—make
only mechanical adjustments in the linkages. This
assures that the servos and their corresponding con-
trol surfaces are in their neutral positions at the same
time.
For this skill level...
set
50% switch...
and set
75% switch...
Beginner (50% rate)
Up (on)
Down (off)
Intermediate (75% rate) Down (off)
Up (on)
Advanced (100% rate)
Down (off)
Down (off)
Connect this servo...
to this FMA receiver* channel...
Elevator
1
Aileron
2
Throttle or
speed control
3
Rudder
4
*If used with receivers from other manufacturers, channel order
may be different. Check your receiver’s manual for channel as-
signments. If you aren’t sure about channel assignments: a) plug
one servo into one receiver channel, and move the transmitter
sticks to determine which stick is associated with that channel, then
b) move the servo to other channels and repeat.
Note
: The 50% and 75% tri-rates simultaneously
desensitize the aileron, elevator and rudder controls.
CAUTION:
If you are at or near a flying field, ob-
serve frequency control rules and comply with local
procedures before turning on your transmitter. When
the transmitter is on—
even for a few seconds
, it is
radiating radio frequencies which may interfere with
a radio system already operating on the same fre-
quency.
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