Skyhawk 172/Cutlass 172
Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 5; Flight Crew Total 3200; Flight Crew Type 1000
Distraction; Time Pressure
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition
Aircraft
After performing a touch and go; on upwind; engine stopped producing enough power to climb then stopped performing enough to maintain altitude with significant shuddering. Called Pan pan pan on the radio and begun an immediate turn to downwind from the upwind. 3 aircraft in the pattern at the time responded and went around. While on downwind; the inability of the engine to maintain altitude resulted in a midfield base and final. Ultimately the pattern was completely nonstandard. I don't believe I could have done anything differently since the failure of the engine to produce power was revealed to be mechanical. I never 'declared' an emergency but there wasn't a need considering I decided to return to the runway. That is the one thing I suppose I could do differently next time. Alas the field is non-towered and I don't believe in this case it would have helped.
C172 pilot reported a loss of engine power in the traffic pattern that resulted in a nonstandard pattern to a successful landing.