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Futaba 8UHPS Manual

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22
H
ELICOPTER
S
ETUP
I
NSTRUCTIONS
The following example shows how the T8U may be programmed for a contest helicopter model. The
settings presented here are for a typical model. Your model’s settings are likely to vary from these, but
the procedures given will still be applicable.
1. Memory Selection
Use the Model menu Select function [MSL]
to select a model memory. Choose the
Helicopter Setup using the SEL function from
Model menu. CAUTION: if you select a new
type of model, you’ll loose all the data already in
the model memory. This example assumes
you’re using model memory 2.
2. Name your model using the Model Name
[MNA] function in the model menu.
3. Hook up controls. In the helicopter, hook up
the aileron, elevator, throttle, and rudder servos in
accordance with the model’s instructions or plans.
4. Plug Servos Into Receiver.
CH1 ......................Aileron
CH2 ......................Elevator
CH3 ......................Throttle
CH4 ......................Rudder
CH5 ......................(spare)
CH6 ......................Pitch
CH7 ......................Gyro Sensitivity
CH8 ......................(spare)
5. Set Servo Throw Direction
Check the proper direction of throw for each
servo. Use the Reversing Function [REV] in the
Basic menu to set proper throw directions.
Reverse channels as necessary to correct throws.
Set up the carburetor pushrod so that the carb may
be fully closed to shut off the engine.
6. Servo Travel
Use the ATV command to limit servo travels
to prevent binding.
7. Throttle Cut Setting
After a flight, use the Throttle Cut function to
kill your engine with the trainer switch. There is
no need to fumble with trim, and the idle trim
position will never be lost.
Enter the TH-CUT settings in the Basic menu,
and set the desired switch (we recommend using
the trainer switch F, in the down or momentary
position). Move the throttle stick a few clicks
above idle, then press the (+)/(–) keys
simultaneously to memorize the position. This
makes it so the engine cut function will only
operate when the throttle is below the set point, so
the engine can’t inadvertently be shut off in flight.
Adjust the throttle servo motion so that when
activated, the carburetor is fully closed and there is
no binding in the throttle pushrod.
Normal Flight Programs
Continue within the Basic functions menu to
set up the Normal flight settings (see the menu
structure on p. 20 for more info):
8. Throttle Curve-Normal
Go to the Throttle Curve [TH-CRV NORM]
function. Input the throttle curve to the values
shown in the table below:
Point 1 2 3 4 5
Setting (%) 0 25 45 75 100
You’ll want to set the throttle so it’s about
half open at Point 3. The throttle responds a bit
slower than linear near center, and then the
response rate approaches linear at both ends.
To get a feel for the way the five-point curves
work, see the figure on p.26.
9. Pitch Curve Normal
Move to the pitch curve function [PI-CRV
NORM] from the model menu. For a semi-
symmetrical rotor blade with no twist, the pitch
angle should vary from -4° to +12°. We
recommend setting the hovering pitch to +4.5°.
… 25 …


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