FO OF A BEECH 1900 EXPERIENCED DIFFICULTY RAISING THE ACFT NOSE FOR LIFTOFF DURING TKOF ROLL AND THE FO CALLED AN ABORT. THE ELEVATOR TRIM WAS FOUND INCORRECTLY SET FOR TKOF FOR COMPUTED WT AND BAL.

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OCT/XA/99 WAS MY FIRST DAY ON LINE AS A CAPT. MY FO HAD BEEN WITH THE COMPANY FOR ABOUT 6 MONTHS AND ON LINE ABOUT 4 MONTHS WITH ABOUT 300-400 HRS IN THE ACFT. IT WAS OUR THIRD LEG OF THE DAY. AT APPROX XA55 WE DEPARTED THE GATE IN ROSWELL; NM; FOR ABQ. WE DID THE AFTER START CHKLIST AT THE GATE AND TAXIED TO RWY 21 AT INTXN D FOR DEP WITH APPROX 9000 FT OF RWY. WE COMPLETED THE BEFORE TKOF CHKLIST. IT WAS THE FO'S LEG. THE INITIAL DEP ROLL WAS NORMAL. AT VR THE FO COULD NOT ROTATE; STATED THE ACFT WOULD NOT ROTATE AND CALLED ABORT; ABORT. I IMMEDIATELY LOOKED AT THE TRIM AND FOUND IT TO BE SET BTWN THE AFT MARK AND ZERO ON THE TRIM WHEEL. THIS WAS WITHIN THE RANGE FOR TKOF BUT FOR A TKOF WITH AN AFT CTR OF GRAVITY. WE WERE LIGHT; OUR TKOF WT WAS 14064 LBS. WE HAD AMPLE RWY; AND SINCE I WAS NOT ON THE YOKE; AND DID NOT KNOW HOW IT FELT; I DECIDED TO ABORT THE TKOF IN CASE THERE WAS A PROB WITH THE FLT CTLS. AFTER CLRING THE RWY WE AGREED AN IMPROPER TRIM SETTING WAS THE PROB. I BELIEVE THE ACFT FELT HVY TO THE FO DUE TO THE AFT TRIM SETTING. WE RESET THE TRIM TO THE +3 POS FOR A NORMAL TKOF. TO BE CERTAIN OF NO OTHER PROBS; WE CHKED THE FLT CTLS AGAIN FOR FREE AND CORRECT MOVEMENT -- EVERYTHING CHKED OUT PROPERLY. WE CHKED FULL MANUAL MOVEMENT OF THE TRIM WHEEL; THE ELECTRIC PITCH TRIM; AND THE PITCH TRIM DISCONNECT SWITCH -- THEY CHKED PROPERLY. WE RETURNED TO THE GATE TO VISUALLY CONFIRM CORRECT MOVEMENT OF THE FLT CTLS -- EVERYTHING WAS FINE. WE DISCUSSED HOW THE PROB MAY HAVE OCCURRED. EITHER THE FO MISSED IT ON THE CHKLIST AND I DID NOT CONFIRM ITS POS; OR THE TRIM WHEEL WAS INADVERTENTLY MOVED MANUALLY OR WITH THE ELECTRIC PITCH TRIM SWITCH. WE THEN TAXIED TO RWY 21 FULL LENGTH AND DEPARTED WITHOUT FURTHER INCIDENT.