DC9-30 ACFT CLRED FOR TKOF WHILE PRECEDING B727 WAS STILL ON TKOF ROLL. RPTR CAPT STARTED TKOF SLOWLY AND ADJUSTED HDG SLIGHTLY AFTER TKOF; BUT HIT WAKE TURB AT APPROX 500 FT. ENCOUNTER WAS 3-4 SECONDS WITH A RAPID JOLT AND ROLL L.

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TOOK OFF BEHIND A B727 AND AT APPROX 500 FT AGL GOT A SHARP JOLT AND AN IMMEDIATE MOMENTARY ROLL (UNCOMMANDED) AND BRIEF STICK SHAKER INDICATION. AIR WAS OTHERWISE SMOOTH. OUR AIRSPD WAS APPROX 150 KIAS AND ACCELERATING. WE WERE CLRED FOR TKOF WHILE B727 WAS STILL ON RWY 27 JUST COMMENCING ROTATION. SUSPECT THAT WE FLEW THROUGH HIS WAKE. OUR PAX COMMENTED ON THIS ENCOUNTER WHEN DEPLANING IN MSP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK IN CONJUNCTION WITH WAKE TURB STUDY. RPTR CAPT AFFIRMED HIS ACFT IS A DC9-30 BUT DIDN'T KNOW THE SPECIFIC MODEL OF THE B727. RPTR CAPT HAD MADE A COMMENT TO HIS FO THAT THEIR TKOF CLRNC WAS A LITTLE PREMATURE SINCE THE B727 WAS STILL ON THE RWY ON A LONG TKOF ROLL. AFTER TKOF; RPTR MADE SLIGHT TURN TO THE R IN ATTEMPT TO REMAIN CLR OF THE WAKE; THOUGH THE CLRNC WAS TO REMAIN ON RWY HDG 270 DEGS. RPTR WAS SURPRISED TO LEARN WHEN TALKING TO THE TWR THAT THEY THOUGHT THE OTHER ACFT WAS A B757; WHICH WOULD HAVE BEEN MUCH WORSE AND CAPT WOULD NOT HAVE ACCEPTED THE CLRNC. RPTR SAYS THE SYS IS SO OVERLOADED THAT HE NOW OPERATES ON THE EXTRA CAUTIOUS MODE AND STEPS BACK A LITTLE TO TAKE HIS TIME; NOT ACCEPTING IMMEDIATE TKOF CLRNCS OR EXPEDITED LNDGS. HE SAYS HE HOPES EVERYONE WILL RE- EVALUATE THE RUSH OF THINGS AND SLOW DOWN A LITTLE.