Sylvain MarronModèle Air Club du MâconnaisFriday, March 4th 2011

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1: Pitch control

2: Throttle control

3: Rudder control

4: Blade balancing

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On transmitter:

• End point (ATV) = 100%• Center (subtrim) = 0• Trim position at middle• Linear Pitch curve:

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Expected setup: Symmetrical collective pitch travel range (–X° +X°)

Put the heli on a flat and horizontal surface area

Servos at center position (throttle stick position at middle):

→ Mount the servo horns so that horns are at horizontal position

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Expected setup: the wash-out, the swashplate and servo horns are at horizontal position

Place the throttle stick at middle position :→ Set linkage rod lengths according to the instruction manual of helicopter

If the wash-out or the swashplate is not at horizontal position:→ Set the wash-out at horizontal position by moving swashplate up or down→ Fine-tune linkage rod lengths in order to set the swashplate at horizontal position

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Throttle stick position at middle, pitch must be equal to 0°

Use a pitch gauge to measure the pitch of each blade

Adjust the length of linkage rods linking the swashplate to blade grips

Throttle stick position at middle → 0°

On the transmitter:

Adjust servo end points (ATV) to set the expected pitch range (-11° +11°)

Servos must not bind

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Expected setup: • Carburetor horn must be always parallel to throttle servo horn.

• When carburetor is half open, throttle servo horn should be straight down

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Mount the carburetor horn in straight down position when it is half open

On transmitter:

• End point (ATV) = 100%• Center (subtrim) = 0• Trim in the middle position• Linear Throttle curve:

Throttle servo on center (throttle stick position at middle):

→ Mount the throttle servo horn so that it is at straight down position

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This procedure ensures there is no differential for the throttle

control

The link length should be equal to the length between throttle servo axle and carburetor axle

The length between carburetor axle and the link ball mounted on the carburetor horn should be equal to the length between the throttle servo axle and the link ball on the throttle servo horn

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On the transmitter adjust servo end points (ATV) :

to have carburetor totally closed

to have carburetor totally open

Throttle stick at the middle position : carburetor is half open

Carburetor closed Carburetor 100% open

Carburetor 50% open 13

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On transmitter set rudder servo parameters:• End point (ATV) = 100%• Center (subtrim) = 0• Trim position at middle

Set gyro in normal mode (no heading lock) to ensure that rudder servo is at the middle position

Mount the servo horn so that the horn is perpendicular to the servo body (the angle between linkage rod and horn should be about 90°)

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Set, by hand, the slider at the middle position of its mechanical travel range

Adjust the linkage rod length to link the servo horn to the slider

Enter servo endpoint limit settings on the gyro by following the instruction manual

Set the sensitivity (gain) of the gyro to be in Heading Lock mode (AVCS)

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Always replace the two blades at the same time and mount blades bought as a pair.

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Find out the center of gravity (CG) for each blade:

→ find out the balanced position

→ mark this position (it is CG’s position)

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Each CG should be at the same position:

→ bind blades together using a thread rod

→ check that marks facing each other (max space ≈ 5mm)

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Mount the blades on a blade balancer:

→ if the blade balancer is not balancing => balancing is needed

Blade balancer Blades mounted on a blade balancer

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Balancing:

→ use the lightest blade

→ cut an ORASTICK® ribbon • length = blade outline (upper surface tailing edge + lower surface tailing edge)• width = big enough to compensate the weight difference between the blades

→ Put the ribbon on the center of gravity of the lightest blade

Blades are balanced ! 22

Mark the blade grip having the “striped” blade:

→ In this way you keep helicopter settings (pitch, tracking, ...) unchanged in case of removing and putting back blades

Marked blade grip 23