Century Hawk Pro Instruction Manual download pdf (Page 29)

Servo Setup & Adjustments

In the steps 37 through 42 over the next few pages the pushrod hardware will be mounted to the servos

horns and ultimately the pushrods themselves. Each step is well described but lets take a few moments to

cover a few basic points on setting up individual servos. By this time the radio will have been charged

overnight. Recheck that all the servo trims are centered. Each radio manufacturer makes servo horns in

different shapes: round, in a cross and sometimes a star, each giving a selection of hole patterns to choose

from.

What we are looking for is equal travel both in the left and right rotation of the servo, this becomes com-

plicated by pushrods attaching to the servo at an angle. To correct this we recommend an angle for the

hole location. For elevator and collective, we suggest 10-15 degrees to allow for this "linear" geometry to

be set up. A range is given to make it easier for you to just choose an available angle, if this is not pos-

sible, simply lift the servo horn off the servo and press into place one "notch" back ( counter-clockwise ).

Choosing the correct servo horn only involves whether

the particular arm or wheel has the correct hole at the

recommended distance measured from servo center to

hole center, off by 1/2mm is ok. When using cross

horns, many times the remaining arms need to be

trimmed off to avoid binding on another servo like

throttle and collective. When two pushrods need to be on

the same horn but each at an angle, the round wheels are

best suited. For wheels that are not predrilled for offsets,

measure and drill your own holes. Remember to origi-

nally set the wheels or arms centered on the servo.

Futaba

cross horn

JR round

horn

Airtronics

cross horn

10 mm

radius

We strive to have all the control surfaces setup linearly, this means that as

the control stick is moved an equal distance from center that the servo

will move a corresponding equal amount of travel. Although this is not

clear now, this will become very clear when adjusting the throttle and

collective servos movements, commonly called the throttle and pitch

curves. At this time it is worth mentioning the danger of the ATV func-

tion, Adjustable Travel Volume has solved many setup problems while at

the same time has created new ones. Most commonly used for throttle to

easily keep the servo from binding, the thing to remember is to keep the

upper and lower values should have the same. If the final values are

different by more that 10 points then a mistake was made in setting the

mechanical limits. Time to go back and recheck.

90˚ 10-15˚

Servo horn shown offset

one notch back on the

output shaft.

The goal in the end after all the servos are mounted is to have the

swashplate sit level or at 90 degrees to the main shaft and have the

swashplate move equally fore, aft and side to side. The swashplate

will also travel up and down as the collective servo is moved, it is

important that in the upper position the washout hub does not

contact the rotor head block while at the same time the swashplate

remains above the top of the frames to avoid cyclic interferrence.

Don't use the pitch gauge until you have installed all the servo

horns and pushrods. Pitch settings usually are the last step in

completing the basic setup for the helicopter just prior to making

the first test flights.

After installing the aileron

and elevator pushrods, the

swashplate should sit level.

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Century Hawk Pro Instruction Manual Page 29

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