Thanks, guys. the motor, controller, servos, and battery (C20 brushless motor, 10A ESC, 3pcs 5g servos, <span class="Apple-style-span" style="widows: 2; text-transform: none; text-indent: 0px; border-collapse: separate; font: medium Times New Roman; white-space: normal; orphans: 2; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"><span class="Apple-style-span" style="font-family: Verdana, Arial, helvetica; color: rgb(51,51,51); font-size: 11px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px">500mAh 2S pack</span></span>) are all sized appropriately, they're part of a package that came with the plane (3d-Hawk). The batteries were charged on abalancing charger, the motor turns in the right direction, and everything seems normal except for the resonating problem. The RX gives the normal start up tones, so that's working fine. Based on what I'm hearing it's starting to sound like a bad component? thanks again. Steve