The problem is that helicopter behavior is often erratic and unpredictable, not to mention unannounced on frequency, as in this case. If the helo blasts across an active runway when you are on short final, you cant go left, cant go right, and with 85hp you cannot get above them if they are at 30 feet instead of 5 feet like they should be. I was lucky to get under one, but probably only escaped by a second or two on short final. There should be a database for reported near misses - it would dwarf the number of accidents.