I just started to fly r/c planes here in NC. I have built and raced rc nitro cars/trucks for years prior but have recently decided to take to the air. I bought a Hobbyzone Champ (to train with, which is tons of fun) and also a Stinson Reliant SR10 as my newest addition. I fly these in local parks and am getting good at the techniques. My local hobby shop owner recommended I join AMA if I wanted to ever fly nitro.

Sorry for the basic questions here, but what exactly is AMA about and can I join if I am still flying electric? And also why do people say it is "mandatory" if I want to fly nitro (as I would like to do one day). Is it legal to fly nitro planes in a park??

Thanks Joe