The private pilot was conducting an orientation flight for one passenger. During landing with a quartering right tailwind the airplane's tail swerved left on touchdown. The pilot attempted to correct the situation with right rudder and additional power. The airplane continued to the left, departed the runway, and spun around. The left gear was broken off the airplane and the left longeron and left horizontal stabilizer were bent. The pilot stated there was nothing wrong with the airplane to cause the accident.