C152 PILOT IN TRAFFIC PATTERN REPORTS NMAC WITH PIPER TWIN ON STRAIGHT IN APPROACH. PIPER GOES AROUND AS C152 CROSSES RUNWAY THRESHOLD.

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THERE WERE APPROXIMATELY 3 OTHER PLANES ALSO OPERATING IN THE PATTERN: 1 PIPER ARROW; 2 CESSNA 172'S AND MYSELF IN A CESSNA 152. CEILING WAS 2100 FT MSL; VISIBILITY 10 MILES WITH A 3 KT WIND FAVORING RUNWAY 6. ALL TRAFFIC WERE OPERATING IN THE PATTERN AND SELF-REPORTING I WAS DOWNWIND ABEAM THE NUMBERS FOR RUNWAY 6 CONFIGURED FOR LANDING (FIRST 10 DEGREES OF FLAPS) AIRSPEED 70 KTS AND DESCENDING AT APPROXIMATELY 300 FPM WHEN THE NAVAJO ANNOUNCED THEY WERE ON A 4 MILE FINAL. I REPORTED MY POSITION ON DOWNWIND ABEAM THE NUMBERS AGAIN ON THE CTAF AND CONTINUED MY DESCENT. I ANNOUNCED MY TURN TO BASE AT APPROXIMATELY 1;100 FT MSL AND 65 KTS. I IDENTIFIED THE NAVAJO AT ABOUT 2 MILES OUT STILL ON AN EXTENDED FINAL. AT THIS TIME THE NAVAJO AGAIN ANNOUNCED ON FINAL FOR RUNWAY 6 BUT DID NOT ACKNOWLEDGE VISUAL CONTACT OF MY AIRCRAFT ON BASE LEG. I AGAIN ANNOUNCED MY POSITION TURNING BASE TO FINAL AGAIN WITH NO ACKNOWLEDGEMENT OF A VISUAL CONTACT FROM THE NAVAJO. I WAS ABOUT 100 FT AGL ON SHORT FINAL WHEN I HEARD THE NAVAJO'S ENGINES. I NEVER SAW THE AIRCRAFT AFTER MY TURN TO FINAL AND DO NOT KNOW HOW CLOSE WE CAME OR WHAT ACTION THE OTHER PILOT TOOK. I MADE MY LANDING AND QUICKLY TAXIED TO EXIT TAXIWAY 'CHARLIE.' AS I STOPPED PAST THE HOLD LINE AT TAXIWAY C TO RECONFIGURE MY AIRCRAFT; I HEARD SOMEONE ON THE CTAF ASK THE NAVAJO WHAT HIS INTENTIONS WERE. THE NAVAJO WAS ALREADY AGAIN ON 'SHORT FINAL.' THE NAVAJO NEVER ENTERED THE PATTERN FOR EITHER THE FIRST OR SECOND APPROACH AND THE ONLY THING I CAN FIGURE FOR HIM TO ALREADY BE ON 'SHORT FINAL' AGAIN IS THAT HE CIRCLED BEHIND WELL BELOW PATTERN ALTITUDE. THIS SITUATION WAS CLEARLY CAUSED BY THE PILOT IN THE HIGH PERFORMANCE TWIN UTILIZING A NONSTANDARD APPROACH IN AN ALREADY ACTIVE AIRPORT ENVIRONMENT. IF HE WAS FLYING THE ILS APPROACH TO RUNWAY 6; HE SHOULD HAVE BROKEN OFF THE INSTRUMENT APPROACH AND ENTERED THE PATTERN FOR THE VISUAL APPROACH AS HE WAS WELL BELOW THE CEILING AND VFR WITH A LOT OF AIRCRAFT IN THE PATTERN. AGAIN; I DON'T KNOW HOW CLOSE WE WERE; BUT AFTER I CUT POWER TO MAKE MY LANDING; I COULD CLEARLY HEAR HIS ENGINES ABOVE THE NOISE OF MINE AND THROUGH MY HEADPHONES. PILOTS FLYING AN INSTRUMENT APPROACH IN A BUSY VFR ENVIRONMENT NEED TO EITHER 'GO MISSED' OR ABANDON THE INSTRUMENT APPROACH FOR THE VISUAL APPROACH AND ENTER THE PATTERN IN AN APPROPRIATE MANNER.