C152 ACT CLBING OUT FROM TOUCH-AND-GO AND TURNING DOWNWIND HAS NMAC WITH A CHEROKEE ACFT WHICH ENTERED PATTERN INCORRECTLY.

Narrative

I WAS CLBING ON THE XWIND LEG OF THE TFC PATTERN AFTER MY THIRD TOUCH-AND-GO. AS I STARTED MY TURN FROM XWIND TO DOWNWIND; I REACHED THE 800 FT TFC PATTERN ALT AND STARTED TO REDUCE PWR. INSTANTLY; A CHEROKEE FLASHED IN FRONT OF ME; THEN L TO R WHILE I WAS STILL IN THE TURN TO THE R ONTO DOWNWIND. THE CHEROKEE WAS NO MORE THAN 100- 200 FT IN FRONT OF ME AT THE SAME ALT. I HAD NOT HEARD THE TWR TALKING TO THE CHEROKEE; NOR HAD I HEARD THE CHEROKEE CALL THE TWR DURING MY ENTIRE CLBOUT AFTER MY THIRD LNDG. AFTER THE CHEROKEE HAD PASSED IN FRONT OF ME AND THEN OUT OF MY PATH; I HEARD THE TWR CLRING THE CHEROKEE TO LAND. I ASKED THE TWR IF THEY HAD SEEN THE CHEROKEE PASS IN FRONT OF ME. THEY SAID YES; AND THAT I SHOULD JUST CONTINUE ON DOWNWIND. I ASKED IF I SHOULD DO A 360 DEG TURN TO THE L FOR SPACING; BUT THEY SAID TO JUST CONTINUE STRAIGHT AHEAD SINCE THE CHEROKEE WAS FASTER. I WAS IN THE PROPER POS IN THE PATTERN. THE CHEROKEE HAD NOT ENTERED THE PATTERN AT THE TRADITIONAL 45 DEG MIDFIELD DOWNWIND POS; BUT INSTEAD ENTERED AT THE POINT WHERE PLANES MAKE THE XWIND TO DOWNWIND TURN. I DON'T KNOW IF THE CHEROKEE PLT EVER SAW ME; AND I DON'T KNOW WHY THE TWR DIDN'T SEE THIS SIT PROGRESSING. FORTUNATELY; OUR PLANES DID NOT COLLIDE. I CONTINUED MY PATTERN AND MADE AN UNEVENTFUL TOUCH-AND-GO; FOLLOWED BY MY 5TH LNDG FOR A FULL STOP; THEN TAXIED BACK TO THE RAMP. NOTE: A CONTRIBUTING FACTOR INTO WHY WE DIDN'T SEE EACH OTHER UNTIL THE LAST MIN (IF INDEED THE OTHER PLT EVER SAW ME) WAS THAT I WAS IN A HIGH WING PLANE IN A R CLBING TURN; PUTTING THE OTHER PLANE IN MY BLIND SPOT; AND THE CHEROKEE WAS A LOW WING PLANE IN A DSNDING L TURN; PUTTING ME IN HIS BLIND SPOT. THEN WHEN WE EACH REACHED 800 FT; WE LEVELED OUT AND THERE WE WERE NEARLY AT THE SAME SPOT AT THE SAME TIME.