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To start with you could use std servos on a 30 heli, but in reality this depends on what type of flying you are into.
Your're ok if you are hovering and doing some circuits.(even fast forward flight)
The collective demands most torque so that is the servo you want to change first. I used std servos on my first Ergo30 which was fine to start with. When I changed the coll. servo I had much more "holding power" to stop the descend of the heli. ( all pilots appreciate this I promise !)
Sceadu 50/ Webra 52