GLIDER INSTRUCTOR AT HWV ARPT WITH STUDENT ANNOUNCED ON UNICOM THAT HE WOULD BE DOING A 'SIMULATED TOW ROPE BREAK.' THE GLIDER PLT STARTED THE MANEUVER AT THE DEP END OF THE RWY AND CAME IN CLOSE PROX WITH A C152 THAT HAD DEPARTED ON A PARALLEL HARD SURFACE RWY.

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EVENT: WHILE INTRODUCING GLIDER STUDENT TO SIMULATED TOW ROPE BREAK AFTER BEING TOWED TO 250 FT AGL; OUR GLIDER PASSED OVER DEP END OF PARALLEL PAVED RWY 33 AS WE WERE DOING STEEP DSNDING 180 DEG TURNS TO DO DOWNWIND LNDG ON SOD RWY PARALLEL TO PAVED RWY USED BY PWR ACFT. A C152 WAS CLBING OUT; UNEXPECTEDLY; OVER PAVED RWY 33 WELL BEHIND US. AS WE COMPLETED MOST OF OUR TURN I SAW THE C152 ABOUT 200 YARDS S OF US AS IT BEGAN A TURN TO THE NW TO STAY CLR OF US. WE COMPLETED OUR PLANNED DOWNWIND LNDG. MY CONCERN IS OUR UNPLANNED XING OVER THE DEP END OF 3500 FT RWY WHEN WE SHOULD HAVE BEEN WELL E OF IT. CONTRIBUTING FACTORS WERE: CESSNA PLT POSSIBLY DID NOT HEAR OUR UNICOM ANNOUNCEMENT OF SIMULATED ROPE BREAK OR DID NOT KNOW THAT IT MEANT AN ABRUPT TURN BY THE GLIDER. THE TOW PLANE WAS ANGLING MORE TO THE E ON CLBOUT. THE TOW PLT NOT KNOWING WE WERE GOING TO TURN L OR R 180 DEGS AT 250 FT. TREES TO E OF GLIDER SOD RWY AS MENTAL BARRIER TO R-HAND 180. CORRECTIVE ACTION ON MY PART SHOULD HAVE BEEN A BUTTON HOOK TURN TO E BEFORE STARTING L 220 DEG TURN TO W. OUR GLIDER CREW COULD HAVE SIGNALED THE CESSNA TO WAIT BRIEFLY BEFORE TKOF.