How To Fix a repancement Servo for Freewing RC Airplane

Hello Hbby friend:

I am general technology engineer from Freewing model.

we are happy to share technology with all hobby friend again today.

RC plane servo setup
As a beginner rc pilot, chances are you've bought a Ready To Fly (RTF) type electric rc plane and the servos (and other components, notably the receiver and ESC) are all nicely installed for you. That's the beauty of today's radio control flying hobby - you can get flying with minimum effort, should you want to!

But there will probably come a time when you buy an Almost Ready To Fly type plane, or build one yourself from a kit/plan, and need to install the radio gear yourself. I sincerely hope that you do go down this route and not just stay with RTFs, because the building side of the hobby is so very rewarding. That's another beauty of the rc flying hobby - it can be as consuming and challenging as you want it to be!

For when you do advance from beginner RTF to ARF or scratch built rc plane, this article will guide you through the process of servo installation.

RC Servo Selection
I'll assume that you have already bought the correct servos for your plane, based primarily on the size of plane and type of flying you're going to be doing. For example, aggressive aerobatic flying calls for more powerful servos than gentle stooging around with a little park flyer type plane.

And, needless to say, bigger rc planes call for bigger servos. The largest servos used are generally called large or giant scale servos, whilst the smallest are micro or even nano servos. In between are the micro and standard servo sizes. See the general rc servo page for more details.

Your servo selection should have been based on the plane manufacturer recommendations made in the instruction manual, or perhaps advice from fellow flyers at your club, or on an internet forum. Either way, the servos you choose need to be of the right specifications for the plane they are going into.



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Various rc servos
Photo above: choose your rc servos according to the plane manufacturer recommendations.

Servo installation - screw or glue?
Ideally rc servos should be screwed in place, preferably to a plywood (or plastic) tray or hardwood crossrails. Almost all servos come with lugs as part of the servo body, with a hole in to take a screw. Only the smallest nano type servos may not have a screw fixing option. Standard size servos will have four lugs, for four screws, whilst micro servos will (generally speaking) just have two.

Two standard rc servos screwed to a ply tray
Photo above: two standard servos screwed down onto a plywood tray.

Servo fixing screw and eyelet Standard (and giant) servos usually come with a rubber grommet and brass eyelet (ferrule) supplied, along with the servo fixing screws. Micro servos will not usually have the grommet and eyelet - the screw goes directly through the plastic lug of the servo body.

When screwing down a standard or large scale servo, it's important to insert the brass eyelets the correct way round inside the rubber grommets. The eyelets should be inserted into the lugs from the bottom i.e. so that the flattened end of the eyelet is at the bottom, between the grommet and the servo tray/rails. It seems more logical to insert the eyelets from the top so that the flattened end acts as a washer for the screw, but this is incorrect.