Wow I must be a rare type. I try pretty hard to make sure I don't have too many different projects going at one. I find that if I try to divide my attention between too many things then they all suffer. The most I have had going at one was 4. This was 2 planes, 1 helicopter and 1 boat. That was enough for me. I guess also I'm a little impatient. I dont really want a half finished planing hanging around for ages.