Regarding servos, my curiosity lies on the innards of the servo, specifically the electronics including the motor. I retired as an Electronics Engineer, so please understand I'm looking for detailed information.

Does anyone have a favorite site/source/etc for explanations on servo operation? Also, I've read in several places where the motor on an airplane needs to be offset to some angle for proper operation. This newbie to RC airplanes would greatly appreciate any site/source/etc or information on this. Thanks a bunch (that's Okie for "I shore appreciate it!!")