TWO ACFT ATTEMPTED SIMULTANEOUS LNDGS ON XING RWYS AT 3SG; AN UNCTLED ARPT. THE STEARMAN PLT MADE NORMAL TFC PATTERN TO RWY 23 FAVORING THE WIND DIRECTION. AN INSTRUCTOR PLT AND STUDENT LNDG ON XING RWY 09 ABORTED WHEN THEY SAW THE STEARMAN ON APCH AT THE INTXN.

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I ENTERED TFC PATTERN AT SAGINAW HARRY BROWNE ARPT (3SG) WHERE MY ENTRY WAS DOWNWIND MID-FIELD FOR RWY 23. I RADIOED MY ENTRY INTO TFC PATTERN AND ALSO UPON TURNING L BASE AND AT THE 3/4 MI FROM TOUCHDOWN POINT. 2 OTHER ACFT WERE IN THE AREA OF THE ARPT. ONE ACFT WAS AT HIGH ALT WITH A LOAD OF PARACHUTE JUMPERS. THE OTHER ACFT LATER ADMITTED TO BEING IN THE TFC PATTERN AND WAS TALKING TO THE JUMP PLANE PLT. PLUS 2 OTHER ACFT IN TRANSIT WERE TALKING ON 122.8 (GENERAL CONVERSATION; NOTHING ARPT RELATED) CLUTTERING THE FREQS. THE OTHER PLT IN THE TFC PATTERN WAS AN INSTRUCTOR WITH A STUDENT PLT. THE INSTRUCTOR PLT SAID HE DID CALL OUT HIS TURNING ON FINAL FOR RWY 9 WHICH I DID NOT HEAR; PROBABLY DUE TO OTHER PLTS TALKING ON SAME FREQ. BOTH THE INSTRUCTOR PLT AND HIS STUDENT SAID THEY HEARD MY RADIO XMISSIONS BUT DID NOT SEE ME UNTIL I WAS OVER THE NUMBERS ON RWY 23; WHICH WAS MORE IN LINE WITH THE WIND BLOWING FROM 170 DEGS TO 190 DEGS. I DID NOT SEE THE OTHER ACFT UNTIL I CROSSED THE RWY INTXN AT ABOUT 50 FT ALT. HE WAS IN THE AIR ABOUT 700-800 FT TO MY R SIDE; TURNING L. I FEEL THAT HE KNEW I WAS IN THE PATTERN AND WHICH RWY I WAS LNDG ON; BUT DECIDED TO CONTINUE HIS APCH ON RWY 9. HE THEN HAD TO ABORT HIS LNDG AND BLAMED ME AS THE RESPONSIBLE PARTY. DURING THE FLT INSTRUCTOR'S REPRIMAND; HIS LAST COMMENTS WERE THAT HE RADIOED HIS POS ON FINAL APCH BEFORE I DID AND THAT HE HAD THE RIGHT-OF-WAY TO LAND FIRST. ALSO; HE HAD APPROX 3000 FT OF RWY AVAILABLE TO LAND HIS ACFT BEFORE REACHING THE RWY 9/23 RWY INTXN. MY FEELINGS ARE THAT THE INSTRUCTOR PLT USED POOR AND UNSAFE JUDGEMENT IN CONTINUING HIS APCH FOR LNDG CAUSING AN UNSAFE SIT.