Basic Aeronautics

[Celwin]

Servo speed is what sells them. When I first started flying, my transmitter came with Hitec HS 300's or HS 311's, I can't remember. They gave 3kg of torque and took 0.19 seconds to travel throw to throw. They were a good servo and were used in all models up to 1/4 scale. Nobody complained about them being too slow, as they were industry standard. Mind you, there was no such thing as flying 3D...

A few years ago I reused some of them. I did notice a hesitant elevator on an Extra 300 but only because I was flying other models with newer servos.

On a trainer and older sport models (Scanners included), most would unlikely notice the difference between a high-spec digital and $12 cheap analog servo. The power of a digital is nice, but something breaks when they hit the ground. Old analog servos lived forever no matter how you land.

My biggest question is, which servo should I buy for a 55 size sport model? Do I invest in a name-brand or go with something cheap from Hobbyking? There wasn't much choice 15 years ago...