I am pretty new to RC. I soloed about a month ago on a Sig LT40 and I'm about halfway done building a Sig Mid-star now. I'm interested in learning about flying pattern and 3D. I know that it will a while before I can even think about getting a pattern plane(cost and experience). I've read everything I can get my hands on and reading the posts here for a while and I have some questions.

1. What is a 2x2 plane?
2. What are the major differences between pattern and IMAC?
3. What is the AA in 3D/AA?

thanx

Nathan