I just want to make you award of something which happened to me… Last year I had several engine shutdown, wich was looking like a flameout for witch we never find out why… During the winter I was doing some test and I finally found that was because of my batteries (2 x 1550ma NIMH) wich was not powerful enough to drive everything… When I was pushing on the control surfaces the power was going so low that the battery failsafe was triggered and then the engine was shutting down… I never thought that 3000mh would not be enough… So I did change for 2x 2000mh LIPO (20c) wich is now a way better and no more Batt Failsafe… So check your batteries to be sure they are powerful enough (by driving your control surfaces)… Just my 2c…