AN ACR LTT HIT A RWY LIGHT WITH ONE OF ITS PROPS ON A TRAINING FLT. ACFT DAMAGED PROP ONLY. INSTRUCTOR PLT TECHNIQUE PREFLT BRIEFING; MONITORING HIS STUDENT. BOTH VERY POOR. STUDENT PLT TECHNIQUE MAINTAINING HDG ON TKOF VERY POOR.

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ALL CHKLISTS WERE COMPLETE PRIOR TO POS AND HOLD ON RWY 21 AT PKB FOR LCL TRAINING FLT. I THOUGHT TRAINING CAPT WANTED A PRACTICE 0/0 TKOF AND HE REALLY WANTED A REDUCE VISIBILITY TKOF WITH HOOD ON. HELD BRAKE TO TKOF PWR AND RELEASED; KEEPING HDG BUG CTRED; WHICH WAS ALIGNED WITH RWY CTRLINE. I THEN FELT RUDDER PRESSURE ON THE L AND THEN FELT SOME BUMPS AND CAPT SAID 'MY PLANE' AND I RELEASED CTLS TO HIM. I FELT SOME BUMPS BUT WHEN I LOOKED UP WE WERE ON RWY SURFACE AND ON THE R EDGE. THE TKOF WAS ABORTED AND WE DID NOT BELIEVE ANY DAMAGE HAD BEEN DONE TO THE ACFT. HOWEVER; THE ACFT WENT OFF THE R SIDE OF RWY AND HIT A TAXI LIGHT AND TOOK OFF ABOUT 1 1/2 INCHES OF THE R PROP AND BROKE THE RWY TAXI LIGHT. WE TAXIED BACK AND CONTINUED THE REST OF THE TRAINING FLT WITH THE BROKEN PROP WITHOUT INCIDENT. WE NOTICED A VIBRATION ON THE R ENG ON SHUTDOWN AND THEN NOTICED PROP DAMAGE. THE PROB WE HAD WAS CREW COM AND THIS CAN BE PREVENTED WITH A PRE TKOF BRIEF WHICH WAS DONE. HOWEVER; I FAILED TO INCLUDE EXACTLY WHICH MODE OF TKOF I WAS USING OR GOING TO BE DOING. I ALSO FELT THE TRAINING CAPT SHOULD HAVE HAD HIS HEAD OUTSIDE THE COCKPIT MORE AND NOTICED THE GENTLE TREND OF THE ACFT TO THE R SIDE OF THE RWY. ALSO; WE SHOULD HAVE SHUT DOWN AND INSPECTED THE ACFT EVEN THOUGH WE FELT NO DAMAGE HAD BEEN DONE.