I have a 10x radio so I have 3 rates, low is just enough to fly, mid is half way between low and high and high is max out all i can get. 50% should be fine, in a previous post I give some better detail scroll back and you will see it. This planes flys great. The rudder servo, go to this link and scroll down. You will see a nice photo... Nice build thread that can help everyone. Going flying with the Yak and Edge good luck
http://www.flyingcirkus.com/forum/m_..._5/key_/tm.htm
take care