According to the pilot's written statement he departed runway 05 and the airplane veered "sharply" to the right. The pilot assumed a failure of the right engine and turned to initiate a landing on runway 23. Seconds after the airplane touched down it began to veer to the left. The pilot applied power to the left engine and right rudder, but the airplane departed the left side of the runway, the right main and nose landing gear collapsed and the airplane came to rest resulting in substantial damage to the right wing. The pilot reported that he had failed to configure the rudder trim prior to takeoff and that there were no preimpact mechanical malfunctions or anomalies that would have precluded normal operation.