RE: Motor specs, what do they mean?
The Aveox web site has some good info on motors in the power range you are looking for"http://aveox.com/hobby.htm" You want a motor in the 700-800RPM/volt range with a resistance in the 40-50 milliohm range. a Aveox 3638/3 or a 4630/3 would be close. Also Kontronik and Hacker have suitable motors too. For what you want stick with the larger frame motors as heat is a problem in helicopters.
Steve