A C172SP LANDED BEHIND A 7ECA STOPPED ON THE RWY PERFORMING STOP-AND-GO FOR TRAINING AT GKY; AN UNCTLED ARPT.

Narrative

I WAS INSTRUCTING FROM THE BACK SEAT OF A TANDEM SCAT TAILWHEEL ACFT (CITABRIA - 7ECA; 180 HP). WE WERE DOING WHEELS LNDGS TO A FULL STOP; THEN GOING AGAIN ON THE 6000 FT RWY. THE C172SP (WITH 180 HP ENG) WAS FOLLOWING US VERY CLOSELY ON SEVERAL CIRCUITS. ACFT Y; IN TURN; WAS FOLLOWED BY A SECOND C172SP. WE ANNOUNCED AND MADE A STOP-AND-GO LNDG ON RWY 16. WHILE WE WERE STOPPED ON THE RWY; N OF TXWY D; C172SP (ACFT Y) LANDED BEHIND US AND ANNOUNCED HE WAS HOLDING SHORT. AS WE WERE N OF TXWY D; THERE WAS LESS THAN 3000 FT OF RWY BEHIND US; SO I ESTIMATE THAT ACFT Y CAME WITHIN 1000 FT OF OUR STOP POS ON THE RWY. IN RETROSPECT; IT WAS A BAD ASSUMPTION ON MY PART TO ASSUME THAT ACFT Y; WHO WAS FLYING AGGRESSIVELY ON OUR TAIL; WOULD EXECUTE A GAR TO PROVIDE SAFE SEPARATION. A 360 DEG TURN IN THE AIR OR A TOUCH-AND-GO ON OUR PART COULD HAVE PREVENTED THE INCURSION ON OUR POS BY ACFT Y; WHO WAS BEING RECKLESS. ACFT Y WAS USING HIS 180 HP ENG TO OUT CLB AND OUT RUN OUR CITABRIA. IF THROTTLED BACK TO 2000 FPM; HIS SPD WOULD HAVE MATCHED OURS. WHILE WE WERE THE LEAD AIRPLANE IN THE SEQUENCE AND HAD THE RIGHT-OF-WAY TO THE RWY; DEFENSIVE FLYING WOULD HAVE BEEN APPROPRIATE TO AVOID ACFT Y.