Throttle Servo Initial Setup (Nitro Engine)

This section only applies to RC helicopter that have a nitro engine in place. We'll see how the linkage from the servo to the throttle should look.

Step # Thirteen - As before, at half throttle position, the servo arm should be close to a 90 degree angle as possible to the linkage rod, which should be close to a 90 degree angle as possible to the carburetor lever arm.

These angles are only approximate, as some linkage rods have to be bent to clear the muffler or manifold.

REMEMBER: The reference starting point for this adjustment is CENTER STICK.

Warning: You need to know which way the carburetor arm moves to close or open, in other words, increase or decrease the throttle. You want to make sure when you position the throttle/collective stick fully down that engine will idle, instead of increasing to high speeds.

Step # Fourteen - Inspect the engine before assembling the engine to the model. For OS engine, the carburetor arm rotates Clockwise to shut off, and Anti-clockwise to open.

On an OS engine, check that the carburetor rotates clockwise when the throttle is reduced to zero stick (Throttle/collective stick all the way down)

Note: In most radios, you have the feature where it will let you adjust the end point settings. The end point will adjust the total travel the servos will give.

For example, if you increase the throttle/collective stick to the fully-up position resulting in 100% of travel. But if you needed to, you can adjust the end point to only give 80% of travel at the fully-up position. You can accomplish this by lowering the end point for the fully-up position to 80% on your radio.

Step # Fifteen - The throttle channel on the Tx may need ATV adjusting, better known as END POINT

With the throttle/collective trim at zero (i.e. fully down) and the joystick also fully down:

1. End Point the throttle channel (channel 3) so you can see the linkage rod trying to very gently move the carburetor lever arm to the decrease/ fully off position.

2. Now you'll know that you can shut down the engine from the Tx with the throttle stick down.

Now, with full collective/throttle stick fully up:

1. End Point (channel 3) so that you can see the linkage rod trying to very gently move the carburetor lever arm to the increase/fully on position.

2. Now you'll know that you have full power when the throttle stick is fully up.

Note: If you notice that the servos are making a binding noise (loud buzz noise) that means the servos are working too hard. If the servos work to hard, they will consume more battery energy and even lower the life of the servo. Try to relieve the binding by decreasing the end point.

Congratulations!

By completing this easy-to-follow guide, you have learned how to setup your servos to the widely recommended use. Best of all, you now know the direction the servos need to move in. As a result to the proper setup, you will greatly decrease your chances of getting frustrated with the setup process.

You have specifically learned how to:

 
• Set a 90 degree angle  
 
• Correct swash operation  
 
• Throttle setup  

Please let me know what you thought about this guide, I'd love to hear from you.