EXPERIMENTAL DR107 PLT ON SHORT FINAL AT S07; OR; HAS NMAC WITH AN EXPERIMENTAL THAT REFUSED TO REMAIN CLR OF THE RWY AND TOOK OFF FORCING THE DR107 TO GAR.

Narrative

I WAS RETURNING FROM A LOCAL FLT. I HAD JUST DEPARTED THE ARPT ABOUT 20 MINS BEFORE AND THE RWY IN USE WAS L HAND TFC. I CALLED FOUR MILES OUT AND THEN AGAIN AT ONE MILE. I CALLED TFC AGAIN TO ANNOUNCE THAT I WAS ON A CROSSWIND OVER THE NUMBERS OF RWY AND TURNING DOWNWIND FOR RWY. MY ALT WAS APPROX 1000 FT AGL. THE ACFT I WAS FLYING WAS AN EXPERIMENTAL AEROBATIC ACFT WHICH HAS NO FLAPS AND A TAIL WHEEL. I ANNOUNCED TURNING L BASE AND NOTICED TWO ACFT HOLDING OFF THE DEP END OF RWY; A CESSNA 172 AND AN EXPERIMENTAL. AS I STARTED TO TURN FROM BASE TO FINAL; I HEARD THE CESSNA ANNOUNCE THAT HE WAS GOING TO 'POSITION AND HOLD.' THIS CONFUSED ME A LITTLE SINCE THIS IS AN UNCTLED FIELD AND NORMALLY POSITION AND HOLD INSTRUCTIONS COME FROM A TWR. I WASN'T SURE IF HE MEANT HE WAS GOING TO HOLD FOR ME SINCE I WAS ALREADY TURNING FINAL; SO I ASKED HIM IF HE WAS GOING TO HOLD OR TAKE OFF. I OBSERVED THAT HE NEVER DID HOLD BUT IMMEDIATELY STARTED HIS TKOF ROLL. BY THIS TIME; I WAS ON SHORT FINAL; SO I ADDED POWER AND TURNED AWAY FROM THE RWY AND ACCELERATED TO JUST PAST MID FIELD AND EXECUTED A CLBING L TURN BACK TO DOWNWIND. THE PLT OF THE CESSNA SAID; 'SORRY' ON THE RADIO. I CONTINUED DOWNWIND AND NOTICED THAT THE EXPERIMENTAL WAS STILL IN THE RUN-UP AREA OF THE END OF RWY. I ANNOUNCED THAT I WAS TURNING L BASE AND MADE CLOSE TFC SO AS NOT TO HOLD UP THE EXPERIMENTAL. I ANNOUNCED THAT I WAS TURNING FINAL AND STARTED MY TURN WHEN THE EXPERIMENTAL STARTED TO ACCELERATE FROM THE RUN-UP AREA TO THE DEP END OF RWY. AS I WAS ANNOUNCING FINAL; I HEARD THE EXPERIMENTAL DECLARE THAT HE WAS DEPARTING. AS HE WAS NOT YET ON THE RWY; I ASKED HIM IF HE COULD HOLD SHORT OF THE RWY. HE REFUSED AND TURNED ONTO THE RWY. BY NOW I WAS ON A VERY SHORT FINAL AND HE DISAPPEARED UNDER MY NOSE. AGAIN; I ADDED POWER AND SINCE I COULD NOT SEE THE EXPERIMENTAL AND KNOWING THAT THEY ARE VERY FAST; TURBOCHARGED AIRPLANES; I DID NOT WANT TO CONTINUE DOWN THE RWY FOR FEAR HE MIGHT CLB INTO ME. FORCING YOUR WAY ONTO THE RWY IN FRONT OF A LNDG ACFT IS NOT ONLY RUDE; BUT DANGEROUS. HAD THE PLT OF THE EXPERIMENTAL BEEN ABLE TO WAIT THREE MINUTES; WE WOULD BOTH HAVE HAD A BETTER FLYING EXPERIENCE.