DC9-50 ACFT ON TKOF ROTATION HIT TAIL SKID.

Narrative

DURING DEP ON FLT WITH 122 PAX AND 7 CREW MEMBERS ON BOARD; AT A TKOF GROSS WT OF 118800 LBS FROM RWY 21C IN DTW; CONFIGURED TO FLAPS 5 DEGS WITH 0% OVERSPD; I MADE THE TKOF FOLLOWING SOPA AND SMAC PROCS AT A NORMAL RATE OF ROTATION OF 3 DEGS PER SECOND. THE FO AND MYSELF HEARD A STRANGE NOISE JUST AS THE ACFT HAD LIFTED OFF AFTER CLBOUT. I TURNED TO THE FO AND ASKED HIM IF HE HAD ALSO HEARD THE STRANGE NOISE. HE SAID YES; AND THAT IT SOUNDED LIKE THE NOSE GEAR. I ALSO SUSPECTED THE NOSE GEAR BECAUSE THE ACFT SEEMED TO REQUIRE SLIGHTLY MORE CTL PRESSURE DURING INITIAL ROTATION. ONCE THE NOSE BECAME UNSTUCK; THE ROTATION FELT NORMAL. AFTER CLBING THROUGH 10000 FT APPROX 15 MINS INTO THE FLT; ONE OF THE AFT STATION FLT ATTENDANTS CAME TO THE COCKPIT AND SAID THAT HE HAD HEARD A NOISE ON TKOF. I THEN SAID IT MIGHT HAVE BEEN A NOISE ASSOCIATED WITH THE NOSE GEAR. HE THEN SAID HE THOUGHT IT CAME FROM THE TAIL OF THE ACFT; SO I THANKED HIM FOR THE INFO AND TOLD HIM I WOULD LOOK INTO AFTER WE LANDED. AFTER LNDG; I INSPECTED THE TAIL AND SAW THAT THE TAIL BUMPER HAD BEEN SCRAPED; BUT THE INDICATOR SAFETY WIRE HAD NOT BEEN BROKEN. I THEN MADE AN ACFT LOGBOOK ENTRY; AND HAD IT RPTED TO MAINT.