Hand launched it with full power and up elevator
That's a big NO NO. Never give full power and up elevator on a hand launch. (well most models) Apply 1/2 3/4 thottle and a nice straight toss!
Can some one please tell me whether its normal for the internal gears in the servo to break in a crash
This is normal depending on the force of the crash and the posistion the servo was in upon impact.