EXPERIMENTAL ACFT PLT EXPERIENCES CONFLICT WITH INSTRUCTIONAL ACFT HOLDING IN POS MID RWY AT DAN.

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I CALLED UNICOM FOR TFC ADVISORY AND WAS TOLD THAT THERE WAS ONE ACFT TAKING OFF FOR TOUCH AND GO AND ONE INBOUND FROM THE E FOR RWY 20. I RADIOED THAT I WOULD BE MAKING A L 45 DEGREE ENTRY INTO THE PATTERN. WHILE I WAS ON THE L 45 DEGREE LINE ABOUT 1/4 MILE FROM DOWNWIND ENTRY; THE WARRIOR (Y); TOOK OFF AND MADE A QUICK L TURN TO DOWNWIND. I SLOWED THE RV4 TO MINIMUM AIRSPEED FOR DOWNWIND AND FOLLOWED THE WARRIOR. WHEN I WAS AT THE POINT TO TURN BASE (1/4 MILE PASSED THE NUMBERS); THE WARRIOR WAS STILL ON DOWNWIND. I CALLED THE WARRIOR AND ASKED IF HE WAS LNDG AT DANVILLE. HE SAID HE WAS; SO I SAID THAT I WOULD GAR BECAUSE I DIDN'T LIKE TO FLY A 3-MILE FINAL. I TURNED XWIND;UPWIND;XWIND AND THEN DOWNWIND CALLING ALL OUT OVER THE RADIO. WHEN ON DOWNWIND; I SAW THE WARRIOR SITTING ON THE RWY. I CALLED BASE; THEN FINAL; THEN SHORT FINAL; BUT THE WARRIOR KEPT SITTING ON THE ACTIVE RWY. SO I CALLED OUT THAT I WOULD GAR AGAIN. WHEN I WAS ON UPWIND THE WARRIOR STARTED TAKING OFF AND CLIMBED OUT QUICKLY. WHEN THE WARRIOR REACHED MY ALTITUDE; IT CAME OVER TO THE R SIDE OF THE RWY AND I HAD TO TURN TO MISS HIM. AFTER I PASSED THE WARRIOR; I CALLED THAT I WAS TURNING XWIND AND TURNED XWIND THEN DOWNWIND. AT THIS TIME THE ACFT INBOUND FROM THE E WAS ON DOWNWIND. I RADIOED THAT I HAD HIM IN SIGHT AND WOULD TRY TO LAND BEHIND HIM. HE LANDED AND CALLED CLR OF ACTIVE THEN I LANDED. I TOLD THE WARRIOR THAT HE WAS NOT SUPPOSE TO STOP ON THE ACTIVE RWY WITH TFC IN THE PATTERN. HE DIDN'T SAY ANYTHING; BUT THAT HE WANTED MY N NUMBER. I GAVE HIM MY N NUMBER AND ASKED WHO WAS FLYING THE WARRIOR. HE WOULD NOT ANSWER ME. CALLBACK CONVERSATION WITH THE RPTR REVEALED THE FOLLOWING INFO: RPTR INDICATED THAT TRAINING SCHOOL ACFT OFTEN STOP MID-RWY DURING TOUCH AND GO OPS AT DAN IN ORDER TO CONDUCT INSTRUCTOR STUDENT DISCUSSION SESSIONS.