N1827Y - 1962 Aircraft Aircraft Registration

A partial loss of engine power due to a stuck exhaust valve and the noncertificated pilot's inadequate preflight planning, which resulted in the airplane being overloaded, both of which led to the airplane's inability to attain a positive climb rate. Contributing to the accident was the pilot's improper decision to attempt to return to the airport at low altitude and his subsequent failure to maintain adequate airspeed and his exceedance of the airplane's critical angle of attack, which led to an aerodynamic stall.