A RYAN ST ATP PLT EXPERIENCES A WINGTIP STRIKE ON TKOF WHEN TEMPORARILY LOSING CTL OF HIS ACFT ON TKOF WITH AN OVERWT PAX AT LOU; KY.

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I DEPARTED RWY 6 AT BOWMAN FIELD FOR A LCL VFR FLT. THE FIELD CONDITIONS WERE CLR AND THE WIND WAS RPTED AS CALM. THE INITIAL TKOF ROLL SEEMED SOMEWHAT SLUGGISH; HOWEVER; THE ACFT DID ACHIEVE NORMAL TKOF ENG PWR; AND I REACHED TKOF SPD SOMEWHERE AROUND MIDFIELD. ROTATION WAS SLOW; AND AS THE ACFT CLBED OUT OF GND EFFECT; I FELT THE ACFT SHUDDER SLIGHTLY AND THE L WING DROPPED. I WAS UNABLE TO STOP THE ROLL BEFORE THE OUTBOARD SECTION OF THE WING AND AILERON STRUCK THE GND. GND CONTACT VEERED THE ACFT TO THE L AND I DEPARTED THE L EDGE OF THE RWY. I FELT I WAS TOO LATE TO ABORT THE TKOF WITH THE REMAINING FIELD AVAILABLE; AND STOP THE ACFT SAFELY. I GOT THE ACFT AIRBORNE; CLBING ON RWY HDG. I COULD SEE A STRIP OF TORN FABRIC FROM UNDERSIDE OF THE WING FLAPPING AFT OF THE AILERON; AND A SLIGHT BUCKLE IN THE AILERON. I WAS UNCERTAIN OF OTHER POSSIBLE DAMAGE; SO I CALLED THE TWR; DECLARED AN EMER; AND ASKED FOR AN EMER RETURN TO THE FIELD. I WAS CLRED AS REQUESTED AND MADE A WIDE R-HAND RETURN TO RWY 6. TOUCHDOWN AND LNDG WERE UNEVENTFUL. MY PAX WAS A NON PLT; AND A LARGE MAN. I DID NOT ASK HIS WT BEFORE THE FLT AND WAS SURPRISED TO LEARN AFTERWARD THAT HE WEIGHED AS MUCH AS HE DID. FROM THE INFO SUBSEQUENTLY AVAILABLE TO ME; WITH THE FUEL ON BOARD; WE EXCEEDED THE MAX GROSS WT OF THE ACFT FOR TKOF BY APPROX 100 LBS. THE FAA HAS PRELIMINARILY DEEMED THIS EVENT AS AN INCIDENT.