Futaba 5NLH FM User Manual download pdf (Page 5)

• General adjustment

Make the linkages and adjustments as described in the model manu-

facturer's instruction manual.

When the throttle (engine control) stick is set from the SLOW side to

the HIGH side, the throttle servo operates as shown in Fig. 14A. If

revolution mixing is applied at this time, the rudder servo operates

together with the throttle servo as shown in Fig. 14B. This operating

width is called the mixing amount. The rudder stick operating width

becomes larger as the number of divisions of the scale become larger.

The rudder servo is operated as shown in Fig. 14B at right rudder stick.

However, if the throttle (engine control) stick is at SLOW, the neutral

position is from the left and if the throttle (engine control) stick is at

HIGH, the neutral position is from the right.

Throttle stick

neutral position

HIGH

Up side

mixing amount

B. Rudder

servo

A. Throttle

servo

SLOW

Right

Left

• Revolution mixing adjustment

When the main rotor rotates, the helicopter attempts to turn in the

opposite direction. To cancel this torque reaction, the pitch of the tail

rotor (rudder) is increased. Revolution mixing performs this operation

simu.ltaneously with the throttle (engine control), and is necessary to

fly

helicopter.

(If

used

with

rate

gyro,

operation

much

easier.)

When main rotor rotates

clockwise.

Tail rotor pitch is increased

so that the helicopter does

not turn to the left.

2 Helicopter turns to the left.

1 Check the direction of operation of each servo. To reverse the

direction of operation, switch the reverse switch.

2 Always set the idle up switch and throttle hold switch to

OFF (pushed to the opposite side).

3 Make the basic adjustments described by the model helicopter

manufacturer.

4 Check the left and right (up and down) throw of each servo. If the

throw is incorrect, correct it by changing the position of the servo

horn hole, etc.

5 Set the throttle stick to about the center (medium slow) and

Down side

mixing amount

Fig.

12 If the helicopter turns to the left during hovering, turn the revolu-

tion mixing up side knob clockwise. If the helicopter turns to the

right, turn the knob counterclockwise.

13 Rate gyro output adjustment (when FP-G153 used)

A position about 40% to 80% of the rate gyro control box scale

should be sufficient. (Differs somewhat with the model.)

If the tail of the helicopter whips back and forth, the gyro output

should be increased.

• Idle up adjustment

When the idle up switch is OFF, the throttle servo operates normally as

shown in Fig. 16A. When the switch is ON, when the idle up trimmer is

suitably set, the throttle servo changes to the maximum slow position

as shown in Fig. 16B.

When idle up is used, hovering is stable and the rotor speed can be held

even when the pitch is reduced during rolls and prettier maneuvers are

possible.

1 Set the transmitter throttle (engine control) stick to maximum slow

and set the idle up switch to ON and set the idle up trimmer to

about 20 to 25%.

2 Next, set the idle up switch to OFF, start the engine, hover, and

decide the speed at hovering. Set the idle up switch to ON, hover,

and adjust the idle up trimmer so that the speed is about the same

as, or somewhat slower than, that when the idle up switch is OFF.

When the idle up trimmer is turned clockwise, the speed increases.

When starting the engine and after use, always set the idle up switch

OFF.

SLOW

HIGH

SLOW

A. Throttle

servo

B. Throttle

servo

• Aileron and elevator AST (Adjustable Servo Throw)

The servo throw is changed within the

range shown by the hatched lines in Fig.

17 with the aileron & elevator AST trim-

mer. The throw can be adjusted from a

maximum 100% to a minimum 40% by

turning each trimmer with a flat blade

screwdriver. Set to the throw matched to

the model.

• Throttle hold adjustment

HIGH

Fig. 16

Fig.

install and link the servo horn at the neutral position.

6 Set the revolution mixing up side knob to about divisor 5 and

revolution mixing down side knob to about divisor 7.

7 Check the engine throttle linkage.

• Throttle opened fully at throttle stick HIGH (up).

Throttle closed fully at throttle MAXIMUM SLOW (down).

• Use ATL (Adjustable Throttle Limiter) trimming as much as pos-

sible.

This is convenient because the HIGH side does not change even if the

LOW side is changed. Then set the throttle stick to its full operating

width and set so that the pitch control servo operates over its maxi-

mum throw.

Regarding the main rotor variation width, select the servo horn

position as specified by the model manufacturer.

8 After starting the engine and adjusting the needle, hover and adjust

the aileron and elevator trim. Next, make the main rotor pitch at

hovering somewhat large with the linkage.

9 Adjust the linkage so that the rudder trim is neutral at hovering.

10 After adjusting all the trim levers, adjust revolution mixing.

the helicopter turns

the

right

during hovering after

lift

off,

turn the revolution mixing down side knob clockwise. If the

helicopter turns to the left, turn the knob counterclockwise.

When the throttle hold switch is pulled on, the throttle servo stops at

the position set with the throttle trimmer. Trimmer scale division 0 is

maximum slow. Setting to the high side is possible as the number of

divisions increases. When the switch is OFF, the throttle servo is con-

trolled by the transmitter throttle (engine control) stick. T his device is

used at auto rotation take off. After the engine is cut or at maximum

slow (during practice), only the pitch control servo is operated (pick

up) and safe take off is possible.

1 Set the throttle (engine control), throttle (engine control) switch

and throttle (engine control) trimmer so that the engine throttle is

fully closed at maximum slow.

2 Set the throttle trimmer so that the engine throttle becomes maxi-

mum slow when the throttle hold switch is set to ON (pulled for-

ward) at autorotation practice. (Set so that the throttle is fully

closed when the engine is cut.)

3 When the throttle hold switch is set to OFF (pushed back), the

throttle (engine control) servo and pitch control servo mixing is

performed. When the switch is set to ON, the throttle servo is held

(maximum slow set by the throttle trimmer or fully closed) and

only the pitch control servo operates.

4 When the hold switch is used at take off, etc., always hold switch

to OFF after setting the transmitter throttle stick to slow. Also,

before starting the engine, check if the idle up switch and throttle

hold switch are OFF.

1 2 3 4 5 6

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Futaba 5NLH FM User Manual Page 5

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