RE: .049 Engine
Just noticed this thread and thought I should mention that Brodak engines are pretty much a CS engine. I heard they will not be making any more castings after the existing ones are used up. They also made a BB .049 and .06 ABC motor as well. It needed a lot of attention to tolerances and stuff but was pretty good. I have a piped one and a normal one, they were about $100 for the piped quite one a while ago. If I needed a 1/2 A motor I would just get the AP Hornet .09 (or .15 which is the same weight and bolt pattern.) They are ball bearing, ABC, super cheap and a good motor considering. They have a throttle and restrictive muffler though. I made a venturi and needle valve for control line for mine. It goes pretty good with the bigger venturi. For $35 it beats a Surestart and is way better for RC. You can't compete in 1/2 A events though. Otherwise, a Profi or Fora is pretty great!!!$