Originally Posted by ausf

First off decide what you want it to do. Simplest and most convincing is just a turning head. Second would be an arm lifting binocs or something similar, but that runs the risk of looking like a Santas Elf in a window type thing.

A 5 gr micro servo would serve fine for turning a head, but if you go from underneath, any servo size will do.

In terms of channels, anything above 6 is too rich for my blood, or at least to warrant the price (I'm not up on the cheapies). But you only get switches above 6 anyway right? It's not like they have more sticks.

The easiest would be a head turn hook up to the rotation, you can go with like it'slooking ahead or against as if it's checking it's back. With Tamiya, you can get the servo to move before the rotation kicks in.

Here's Squidward (thrice decapitated in battle so far) piggy backed on rotation of a normal 4 channel Attack Tx.

https://www.youtube.com/watch?v=ONW9lqzBgGg