Servos are Emax ES08MAII Analog Servos. They are the ones that Clark specifically uses. When only one is plugged in works perfect, but when both are plugged in they both work for a short time then the elevation servo goes to full elevation and the recoil servo stops working.
When they are not connected to the linkages, specifically the elevation servo twitches randomly with no inputs from the radio.
i do not know what a BEC is?