RPTR CITES OTHER PLT'S SCANNING VIGILANCE AS CONTRIBUTING TO NMAC; AT AN UNCTLED FIELD; WITH A LOW PATTERN ALT.

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ON THE DATE AND TIME OF OCCURRENCE; I WAS FLYING A PIPER J-3 CUB. THE OWNER OF THE ACFT WAS SEATED IN THE FRONT SEAT; AND I WAS PIC. AFTER A SHORT FLT; WE RETURNED TO THE ARPT AND I FLEW A NORMAL PATTERN AT 600 FT AGL; THE CORRECT PATTERN ALT; FOR THIS ARPT. I TURNED ONTO FINAL; AND WAS PREPARED TO LAND. AT APPROX 100 FT OR JUST BELOW; AND JUST BEFORE THE RWY THRESHOLD; MY ATTN WAS BROUGHT TO A MOTION OVER THE GREENHOUSE ROOF OF THE CUB. I LOOKED UP TO SEE THE LNDG GEAR AND LOWER COWLING OF A CESSNA 150 OVERTAKING AND SETTLING DOWN TOWARDS US. I NOSED DOWN AND BANKED SLIGHTLY TO THE R; AS HE MOVED FORWARD; THEN I ADDED PWR AND SLID OUT FROM UNDER THE CESSNA 150. FORTUNATELY; I HAD THE ALT LEFT TO DO THIS. I COMPLETED THE GAR; RE-ENTERED THE PATTERN; AND LANDED. WHEN I CONFRONTED THE PLT OF THE CESSNA 150 (ALSO BASED AT THE ARPT); HIS STATEMENTS INCLUDED 'GEE; I NEVER SAW YOU; BUT I CALLED ON THE RADIO.' (THIS ARPT IS A TURF FIELD THAT HAS AN ABUNDANCE OF ANTIQUE ACFT. MANY NON RADIO; AS THE J-3 I WAS FLYING.) 'I WAS AT 750 FT AGL IN THE PATTERN' (ANY ALT OVER 700 FT IN THE PATTERN WOULD PUT HIM IN CLASS C AIRSPACE AT ISLIP-MACARTHUR ARPT; 3 MI NE) AND 'WELL; I DID MAKE A PRETTY SHORT BASE LEG.' I BELIEVE WHAT CAUSED THE PROB WAS THE CESSNA 150 PLT'S LACK OF KNOWLEDGE OF PROPER PROC AT UNCTLED ARPTS AND FAILURE TO WATCH FOR OTHER TFC IN THE PATTERN. AS WELL AS HIS MISTAKEN IDEA; THAT USE OF AN ACFT RADIO IS ADEQUATE PROTECTION FROM TFC CONFLICTS.