Futaba 8SGAP User Manual download pdf (Page 29)

•AIRCRAFT WITH VARIABLE PITCH PROP

ADVANTAGES OF VARIABLE PITCH PROPELLER

The variable pitch propeller offers such advantages as:

1. The desired speed and p ul l can be adjusted.

Fig.

Linkage

2. Speed matched to the engine is obtained.

3. Low noise.

4. Air braking effect by

zero pitch.

5. Idling is unnecessary.

Pitch control

servo

High pitch-

Matching of the variable pitch propeller to the digital proportional RC set is essential. Improper use is ex-

tremely dangerous. Therefore, read this section carefully.

Low pitch

High pitch

Low pitch

Connect the

pitch

control

servo

channel

variable

pitch

propeller

can

adequately controlled by

common servo. Handle the servo the same as any other servo.

Install the servo and linkage as specified by the manufacturer. (Note) This section explains how to use a

MK variable pitch propeller.

Set switch

[7]

to the ACT

position. Turn trimmers[4]

and

[5]

fully counterclock-

wise.

Since trimmer 6 is adjusted

after making a test flight, set

it to about the center.

Switch II is the mixing ON-

OFF switch. When it is set to

the OFF position, monitor

lamp 22 B comes on. When

it is set to the ON position,

the lamp goes out. Set the

switch to the ON position

and check the pitch control

(channel 8) servo stroke and

direction. Set the servo so

the propeller is pitched when

the throttle stick is set to

HIGH and is zero pitch when

the throttle stick is set to

LOW. If the servo turns in

the wrong direction, reverse

the setting of servo reversing

switch 57 .

Fig.

Next, adjust the servo stroke. First set the trans-

mitter pitch control lever 8 to the HIGH posi-

tion. Then adjust the pitch control servo stroke

with the ATV trimmers 48 and 49 so a load is not

applied to the linkage. Set the mixing throttle po-

sition is 1 stop from the SLOW position (Fig. 52)

with the THROT POSIT trimmer [8], and check

if:

* The pitch is zero (minimum) when the throttle

lever is set to minimum slow.

* The pitch becomes 11 (maximum) when the

throttle lever is raised one stop.

Next, adjust the transmitter upper side pitch con-

trol HIGH

side

trim

lever

throw.

Set

the throt-

tle lever to the HIGH side before making this

adjustment. Since lever 8 should be linked with

pitch 11 (maximum) the propeller pitch when this

lever is set to the lowest position must be checked.

A variable pitch propeller is difficult to measure

with a pitch gauge. Therefore, adjust trimmer [6]

for a pitch somewhat lower than the maximum

pitch 11 .

Pitch 11 (maximum)

at one stop

HIGH

Fig.

Pitch 0 (minimum) in slow

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Futaba 8SGAP User Manual Page 29

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