Haven't done as much record keeping on my 1/2a's as i should have, only flown one in competition. My built up lightweight ( 9 oz. ) models i run a 6x2 apc with 10% nitro, 22% oil on 42 to 48 foot lines, depending on wind. On my heavier (11 oz.) models i run a cox 5x3 and 25 % omega. A couple of my engines are the helicopter norvel bushed engines, they run great. I use either norvel plugs or Merlin plugs, no head gaskets and spring starters. Mostly don't use a tach, launch by ear. Hayes tank on muffler pressure or balloon tank. My Brodak 1 1/3 oz tank should be here tomorrow, i will set it up uniflow and should have the new half lite done next week , maybe can do some testing. Haven't had much handle time lately , i will keep better notes in the future!