I just bought Cermarks Dragonfly electric glider. I live on Maui Hawaii. flying about one month.. Now at the point where I don't crash my aircraft anymore... I've been learning from some really nice helpful pilots here... I started with cheap disposable park flyers [electric ones] Now into sailplanes.. We fly here on a slope at the 3500ft level.[up the mountain] Good spot.... Anyway Cermark sent me hs-50 hitec feather servos and a esc-5- motor control -and gws 4 channel pico type receiver 73 mhz crystal 72.310 channel #26. 6-cell battery with car charger. whole set-up... First off with fully charged battery motor runs dead in less then a minute...So I took off the prop made sure aircraft was cg'd correctly and ltossed off slope and the plane flew great for several minutes and glicted out of my control and crashed...When I picked up the plane... I found that if you just tapped the fusalage the servos went wild up and down and side to side out of control... Is this a bad receiver and or servos??? Any suggestions????P.S I have a Aspire RTF electric that flys great no problems and a j3 piper cub no problems in the same spot up to cloud level --here at about 500 or so feet above us...No-one else on my frequency either... also I'am using my Hitec radio transmitter that came with the Aspire with the same crystal...72mhz 72.310 in the receiver.. Aloha Rich W.....