C150 IN BUSY UNCTLED TFC PATTERN AT KLS EXPERIENCES NMAC WITH ANOTHER ACFT ON FINAL FOR RWY 30 WHO APPEARED TO HAVE BEEN PERFORMING A STRAIGHT IN APCH AND FAILED TO UTILIZE THE CTAF FOR ADVISORIES.

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AS I ENTERED THE PATTERN FOR LNDG AT KLS RWY 30 (ON RWY 45 FOR L DOWNWIND RWY 30) I TOOK NOTE THAT THERE WERE 4 OTHER AIRPLANES EITHER IN THE PATTERN OR COMING IN FROM THE N TO ENTER THE PATTERN. I WAS ABLE TO IDENT THE 3 AIRPLANES IN THE PATTERN AHEAD OF ME AND VERIFIED VIA RADIO THAT THE 4TH AIRPLANE WAS STILL A COUPLE OF MI N. ALL THE AIRPLANES AHEAD OF ME LANDED WITHOUT INCIDENT. AS I TURNED BASE THERE WERE 2 AIRPLANES ON THE RWY; A SINGLE ENG PLANE LNDG AND GETTING READY TO TURN ONTO THE TXWY AND A TWIN ENG READY FOR TKOF. BECAUSE OF THIS CONGESTION I WAS WATCHING THIS CLOSELY IN CASE I HAD TO DO A GAR. THE SINGLE ENG PLANE TURNED ON TXWY WITH ANNOUNCEMENT ON RADIO (CTAF). THE TWIN TOOK OFF AND I TURNED FINAL ABOUT THE SAME TIME. WHEN I WAS DOWN TO ABOUT 300 FT MSL I SAW ANOTHER SINGLE ENG PLANE AT A FASTER SPD LNDG UNDERNEATH ME. I IMMEDIATELY TURNED TO THE R TO GET OFF HIS PATH AND ENGAGED GAR PROCS. I ESTIMATE THAT I WAS LESS THAN 100 FT DIRECTLY ABOVE THE OTHER PLANE WHEN IT PASSED UNDER ME. AS FAR AS I COULD TELL THERE WERE NO RADIO XMISSIONS FROM THIS PLANE. ALSO; BECAUSE OF MY AWARENESS OF THE PATTERN I FIND IT LIKELY THAT HE DID A STRAIGHT IN FROM THE S. SINCE THERE ARE HILLS ON THE R SIDE OF RWY 30; AS SOON AS I HAD POSITIVE RATE OF CLB I TURNED ACROSS THE RWY AND HEADED DUE W UNTIL I COULD REENTER THE PATTERN AND COMPLETE MY TOUCH AND GO LNDG. JUST AS I WAS AVOIDING THE OTHER PLANE I HEARD SOMEONE BROADCASTING THAT 2 PLANES WERE TRYING TO LAND AT THE SAME TIME. ONCE CLBING I ANNOUNCED THE ABORTED LNDG AS I WAS HDG W.