A GLIDER INSTRUCTOR IN AN SGS 2-33 RPTED THAT HE DID NOT TAKE THE CTLS EARLY ENOUGH FROM HIS STUDENT DURING A LNDG ATTEMPT; CAUSING THEM TO LAND LONG. THEY HIT A RAILROAD TIE; CAUSING EXTENSIVE DAMAGE TO THE WINGTIP.

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NOV/XA/99 AT XA30; I WAS CONDUCTING A LCL VFR TRAINING FLT IN A SCHWEIZER SGS 2-33 GLIDER; BASED AT WAYNESVILLE ARPT; OH. THE WX WAS CLR SKIES AND UNRESTR CEILING; WITH LIGHT AND VARIABLE WINDS FAVORING THE S. MY STUDENT HAD 19 FLTS AMOUNTING TO 6 HRS OF TRAINING WITH ME. THE STUDENT FLEW A NICE AERO TOW AND DEMONSTRATED PROFICIENCY IN THE BASIC TRAINING MANEUVERS ON AND OFF TOW; AFTER WHICH WE ENTERED A NORMAL PATTERN FOR LNDG. TURNING FINAL WE WERE HIGH AND FAST. I LET THE STUDENT CONTINUE AND SHE BEGAN CORRECTING APPROPRIATELY WITH SPOILERS FOR OUR GLIDE PATH. THOUGH SHE MAINTAINED HER EXTRA SPD; WE WERE ON TARGET FOR OUR AIM POINT AS WE ENTERED GND EFFECT. AT THIS POINT SHE BEGAN FULL DISPLACEMENT AND RETRACTION OF THE SPOILERS; PERHAPS IN AN ATTEMPT TO MAKE A 'SMOOTH' LNDG. I TRIED TO COACH HER TO THE PROPER TECHNIQUE; BUT ONLY WASTED VALUABLE RWY. I TOOK CTL TOO LATE FOR NORMAL STOPPING TECHNIQUES; AND IN AN ATTEMPT TO STOP WE HAD TO AVOID A PARKED ACFT AND EVENTUALLY STRUCK A RAILROAD TIE WITH THE R WINGTIP DOING SUBSTANTIAL DAMAGE. THE SPOILER HANDLE IN THIS GLIDER EMPLOYS A WHEEL BRAKE ON THE LAST FEW INCHES OF TRAVEL. WHEN I FIRST APPLIED FULL BRAKING; THE HANDLE CAME OFF IN MY HAND. THEN ON REAPPLICATION; THE WHEEL LOCKED UP AND WE SLID ON THE WET GRASS TO IMPACT. I BELIEVE IT WAS POOR JUDGEMENT ON MY PART TO WAIT SO LATE IN THE LNDG TO TAKE CTL.