C182 pilot reports NMAC with C150 on short final at uncontrolled airport. A go-around was executed and a radio call heard from the other pilot. Reporter had self announced and did not hear any other traffic.

Narrative

At approximately XA30 hours I entered a 45 degree pattern for right traffic for a full stop landing on Runway 17. Prior to entering the pattern and throughout; I announced my position and intentions. During these announcements I heard no other aircraft in the pattern. A few moments after announcing a one mile final for Runway 17 full stop I observed a green Cessna 150 to my right turning final. This aircraft was just below my nose 150 FT below me! I took evasive action by doing a go-around to the left of the runway and radioed my intentions. After completing my radio call I heard in broken English; something to the effect of 'final Runway 17.' I reentered the pattern by turning upwind of Runway 17 while this aircraft was taking off from Runway 17. I then landed my aircraft. I remained on the ground and fifteen minutes later this aircraft landed and I observed two young men of foreign descent in the aircraft and photographed the plane. As the pilot walked passed me I asked him is he was aware that he had cut me off while I was on final. He looked at me with a blank stare as if he couldn't understand what I was asking. A few moments later the passenger came out and walked past. I asked him if he was a CFI and he said yes. I then asked him if he was aware that he had cut me off while I was on final. He said that he had announced turning base and final on the radio. I told him that I did not hear anything on the radio till after I was cut off and I announced that I was doing a go-around.