Beechcraft / Beech Aircraft Corp Undifferentiated or Other Model
Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 70; Flight Crew Total 10000; Flight Crew Type 70
Aircraft Equipment Problem Critical
Aircraft Equipment Problem Dissipated; Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
I was on climb out from the airport when; suddenly; the right engine began running rough. I immediately took action to recover the engine. The engine [stopped developing power]; so I put the mixture forward and turned the boost pump on. At that time I called the Tower and declared an Emergency. I then proceeded to turn the carb heat on and was going to attempt to restart the engine. Applying carb heat was sufficient to recover the engine and it started running rough again. While descending the engine began to run smoother. Upon landing; the engine was running and I terminated the emergency. I taxied in and had a Mechanic look at the engine.
A Beech 18 pilot declared and emergency and returned to the departure airport when the engine began to run rough and then quit developing power.  During the descent; upon applying carbuetor heat; the engine recovered.