Keep in Trim- Chris Bransbury

Hello everyone and welcome to ‘Stay In Trim’.
This page is tailored to fulfil your basic modelling needs and is where I will be covering topics such as airframe setup, internal cosmetics, radio setup and simple aerobatics. I am certainly no expert in the field and the information here has all been compiled from various sources that I have found very helpful when setting up my models in previous years. I hope you find it useful!
Servo Setup
Linkage systems, including the servo, servo arm, pushrod and control horn, are items that are often overlooked, but are key to smooth, strong, equal control-surface deflection. You must take time to ensure all servos are secure and linkages properly tightened with the use of Loctite to prevent any vibration working them loose.
Firstly, it is important to select the correct servo arm for each individual control surface. Your choice should depend on the torque output of your servo, the range of movement required and the type of flying you wish to execute. Aluminium arms are always my personal choice for the obvious reason that they don’t flex. However, they are more expensive then a standard plastic arm.
The length of the arm is also important, as it must be sufficiently long to fully deflect the control surface to the full extent of travel in either direction of the servo. This is crucial, because if the arm is too long you won’t be using the full capability of the servo and consequently servo resolution will suffer. By using the full servo movement, you will maximize the servo precision and power.
Most setups should have the servo arm at 90 degrees to the servo case when the stick is in the central position.
I find the following videos particularly useful:
Enjoy your flying!
Chris