When setting your control throws, sub trims etc. be sure to have all servos in neutral and servo arms at 90 degrees. this is accomplished by rotating servo arm on shaft since hub of arms are asymetrical. Attempt to maintain neutral position by mechanical adjustment rather than using trims. Provide sufficient throw in ailerons and elevator to get quick responce in initial flight, use dual rate to modify if needed when establishing flight trim during initial flights. Check elevator reaction at good altitude. Some aircraft will snap with too much elevator, especially if tail heavy. After initial flights make needed corrections mechanically, thereby permitting resetting to neutral on tx. Buy quality equipment, saving $100 is a costly error when you crash. Keep battweries properly charged and cycled. Make range checks often. Be sure of proper control movement before leaving home.