RV-6 PLT INITIATES GAR DUE TO C152 TAKING RWY IN FRONT OF LNDG RV-6.

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3 ACFT WERE IN THE PATTERN TO LAND. THE FIRST TWO WERE PIPERS AND I (ACFT X) WAS THIRD TO LAND IN A VAN'S RV-6A. THE SUN WAS LOW AND CLOSE IN LINE WITH RWY 24. ALL 3 PLANES WERE RPTING THEIR POS ON THE CTAF FREQ AND I ANNOUNCED THAT I WAS CLOSE TFC. THERE WERE 2 CESSNA'S IN LINE TO TAKE OFF. THE FIRST PIPER FLEW A VERY LONG PATTERN AND LANDED. THE SECOND PIPER FLEW A NORMAL PATTERN AND LANDED. I BEGAN MY DOWNWIND TO BASE TURN JUST BEYOND THE APCH END OF RWY 24 AS THE SECOND PIPER TURNED OFF THE RWY. MY APCH WAS A CONTINUOUS; DSNDING TURN TO RWY 24. WHEN I WAS ABOUT 30 DEGS TO THE RWY ON THE BASE TO FINAL PART OF THE TURN AT ABOUT 300 FT AGL; THE FIRST CESSNA (ACFT Y) TAXIED ONTO THE RWY AND BEGAN THE TKOF ROLL. THE CESSNA MADE NO RADIO ANNOUNCEMENT THAT I RECALL. I INITIATED A GAR BY DECREASING MY RATE OF TURN; APPLIED FULL PWR; AND RETRACTED FLAPS WHILE STILL AT MY APCH ATTITUDE. I LEVELED OUT/PULLED UP WITH THE LOWEST POINT AT ABOUT 50 FT AGL. I STAYED IN A L TURN TO KEEP THE CESSNA IN SIGHT ABOVE MY L WING. THE CESSNA WAS ABOUT 300 FT DOWN THE RWY WHEN I CROSSED THE RWY. I PASSED OVER THE RWY CLBING L AND AT APPROX 75-100 FT AND 500+ FT IN FRONT OF THE CESSNA TAKING OFF; KEEPING IT VISIBLE OFF MY L WING. THE CESSNA CONTINUED ITS TKOF AND DEPARTED THE PATTERN TO THE S. SHE (CESSNA) ANNOUNCED THAT SHE WAS 'SORRY' ON THE RADIO. I CONTINUED TO CLBING L TURN TO DOWNWIND AND THEN LNDG. AFTER MY LNDG THE SECOND CESSNA DEPARTED. I THINK THE FIRST CESSNA WAS NOT PAYING ATTN TO THE RADIO; AND AFTER SEEING THE FIRST PIPER MAKE SUCH A LONG PATTERN; SIMPLY TOOK OFF AFTER SECOND PIPER WITHOUT LOOKING.