Tail Rotor Proportional Mix Trimmer Pot Adjustment - E-flight Blade SR RTF Airframe Instruction Manual

Tail Rotor Proportional Mix Trimmer Pot Adjustment

After trimming the primary flight controls and becoming familiar with the handling of the model, you may also need
to adjust the tail rotor proportional mixing. The proportional trimmer pot adjusts the amount of tail motor to main
motor mixing.
After establishing a stable hover, quickly advance the throttle/collective stick upward to "pop" the helicopter up a few
feet in altitude while adding no rudder input. During the abrupt increase in altitude, note which direction the nose of
the helicopter may yaw/turn. If the nose of the helicopter does not yaw in either direction by a significant amount, no
adjustment is necessary. However, if the nose of the helicopter yaws to the left, you will want to increase the amount
of tail motor to main motor mixing. By turning the proportional trimmer pot clockwise (+), you increase the tail motor/
rotor rpm for a given main motor/rotor rpm. This increase in tail motor/rotor rpm will help to push the nose of the
helicopter to the right when there is an abrupt change in torque.
If the nose of the helicopter tries to yaw to the right, decrease the tail rotor proportional mix by turning the proportional
trimmer pot counterclockwise (-).
Note: You must always power down the 2-in-1 control unit before making adjustments to the proportional mix
trimmer pot. Any changes made to the trimmer pot will not take effect until the 2-in-1 unit is rearmed.
Proportional Pot
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Main Rotor Blade Tracking Adjustment
Caution: B e sure to maintain a safe distance from the helicopter (approximately 10–15 feet) and to wear
appropriate eye protection (such as safety goggles) when tracking the main rotor blades.
Blade tracking is a critical element to the flight performance of just about any helicopter, including the Blade SR. Main
rotor blades that are out of track may cause vibration, instability, and loss of power. Although each Blade SR model
is test flown and tracked at the factory, you may need to adjust blade tracking after blade changes, repairs, or pitch
control link adjustments.
To check main rotor blade tracking and make any required adjustments, please note the following tips:
• Before proceeding with the test flight of a new model, or any model to which changes or repairs have been
made, be certain that the main rotor blades have been properly installed and secured. The main blades
should be tightened so they can pivot in the blade grip when moderate pressure is applied. Never allow the
main blades to swing freely in their grips.
• After powering the model on and allowing the 2-in-1 unit and gyro to arm and initialize properly, bring the
main rotor blades of your Blade SR up to speed. You can check the blade tracking either on the ground or
in the air at eye level. It might be a good idea to have an assistant on hand to help sight the blades. Again,
be certain to maintain a safe distance of approximately 10–15 feet from the helicopter when checking the
tracking of the main rotor blades.
• Once the main rotor blades have been brought up to speed, note which blade is running low and which blade
is running high (by the colored tracking tape).
• After confirming which blade is running low and which is high, power down the helicopter in order to make
any necessary adjustments to the linkages. You can increase the pitch of the low blade by lengthening its
pitch control linkage. This is accomplished by turning one of the Ball Link ends out by one-half to one full turn.
Or, you can decrease the pitch of the high blade by shortening the linkage.
Note: The blade you choose to raise or lower when making tracking adjustments will depend on the pitch of
each blade. Because both rotor blades should be as close to 0 degrees as possible when throttle hold is
activated (DO NOT attempt to check for 0 degrees pitch in the normal or stunt/idle up flight modes) and
the throttle/collective stick is in the middle position, you can easily identify which rotor blade to adjust.
Blades Out of Track - Adjustment Necessary
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