CIRRUS SR20 PLT HAS AN NMAC AT DYL.

Narrative

I WAS ON A VERY SHORT FINAL TO LAND ON RWY 23; WHEN I HEARD AN ACFT BROADCAST THAT THEY WERE TAKING THE ACTIVE RWY. I NOTICED THAT THE ACFT HAD NOT PASSED THE HOLD LINE; AND I IMMEDIATELY XMITTED THAT I WAS ON SHORT FINAL. I OBSERVED THAT THE DEPARTING ACFT STILL HAD SUFFICIENT TIME TO STOP AFTER MY XMISSION; AND REMAIN CLR OF THE ACTIVE RWY. INSTEAD OF STOPPING; THE DEPARTING ACFT ACTUALLY SPED UP. WHEN I REALIZED THIS; I IMMEDIATELY EXECUTED A FORCED GAR; SINCE THERE WAS NO POSSIBILITY OF LNDG WITHOUT THE 2 ACFT COLLIDING. I THEN TRIED TO ESTABLISH COMS WITH THE DEPARTING ACFT TO ENSURE THEY KNEW OF MY POS. I RECEIVED NO RESPONSE AFTER SEVERAL ATTEMPTS. THE LACK OF RESPONSE FROM THE ACFT CONTINUED TO COMPROMISE THE SAFETY OF MY PAX AND ME. IN ADDITION; THE GAR HAD FORCED US TO BE IN A DANGEROUS POS WITH OTHER ACFT THAT WERE ENTERING THE PATTERN VIA A XWIND ENTRY; SINCE I WAS AT A HIGHER ALT ABOVE THE RWY THAN NORMAL FOR A DEPARTING ACFT. I FINALLY TOLD THE ACFT THAT I COULD NO LONGER SEE IT BECAUSE IT WAS UNDER MY WING. THIS TIME I RECEIVED A RESPONSE THAT THEY WOULD CONTINUE TO GO STRAIGHT OUT; AND THAT I SHOULD JUST CIRCLE AROUND THEM. THIS RESPONSE CAME WITH A LOT OF ATTITUDE FROM THE OTHER PLT; LIKE THEY WERE DISGUSTED AT ME FOR BOTHERING THEM. SUPPLEMENTAL INFO FROM ACN 715060: I ANNOUNCED OVER THE UNICOM THAT I WAS TAKING THE ACTIVE RWY 23 AND TAXIED ONTO RWY 23 AND BEGAN MY TKOF ROLL. I ANNOUNCED MY L XWIND TURN AND CONTINUED TO CLB ABOVE PATTERN ALT AND EXITED THE PATTERN TO THE SE AND THEN CHANGED HDG TO E TO CONTINUE OUR TRAINING MISSION. I STAYED ON DYL UNICOM FREQ UNTIL REACHING NEW HOPE; PA. AT THIS POINT I SWITCHED OVER TO TTN TWR TO MONITOR AIR TFC TRANSITIONING IN THE AREA OVER NEW HOPE AND LAMBERTVILLE. (NOTE: AFTER WHEELS UP AT DYL; I DID NOT HEAR ANY CONVERSATION OVER THE DYL UNICOM EXCEPT FOR MY ANNOUNCEMENTS.)