B350 ON ITS TKOF ROLL ON RWY 5 AT SOP; ENCOUNTERS A PA28 TAXIING ON THE RWY TOWARDS THEM. B350 SWERVED TO THE R AND ABORTED THE TKOF; MISSING THE PA28 BY 30 FT.

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WE WERE DEPARTING KSOP ON RWY 5; WIND WERE CALM. MADE NUMEROUS RADIO CALLS THAT OUR KING AIR WAS TAXIING FROM THE RAMP TO RWY 5; DEPARTING RWY 5; ETC.... ARCHER MADE NO RADIO CALLS. WE HEARD OTHER ACFT IN PATTERN USING RWY 5. AS WE WERE ACCELERATING TO V1 THE ARCHER CAME OVER THE HUMP IN THE RWY. HE WAS USING RWY 23. I SWERVED R AND ABORTED THE TKOF. WE MISSED BY 30 FT. THE FACT THAT THE ENDS OF THE RWY ARE NOT VISIBLE FROM ONE ANOTHER WAS A MAJOR FACTOR IN THIS OCCURRENCE. ALSO; THE FACT THAT THE ARCHER MADE NO RADIO CALLS IS THE MOST IMPORTANT FACTOR. THE BEST WAY TO AVOID THIS PROB IN THE FUTURE IS FOR RECREATIONAL FLYERS TO BE MORE PROFESSIONAL AND PROFICIENT IN THEIR FLYING FOLLOWING STANDARD ESTABLISHED PROCS FOR OPERATING IN NON CONTROLLED ENVIRONMENTS. ALSO; FOR LARGER FASTER ACFT TO BE MORE VIGILANT IN THEIR OPS LOOKING FOR THE SMALL SLOWER ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR INDICATED THAT THE PA28 DID NOT SEE THEM UNTIL THE LAST MINUTE. IT APPEARED THAT THE INSTRUCTOR PLT WAS NOT LOOKING OUTSIDE THE COCKPIT; BUT DISCUSSING SOMETHING WITH THE STUDENT. ALSO; THE RWY 5/23 HUMP IS VERY DRAMATIC AND FLT CREWS NEED TO PAY SPECIAL ATTENTION TO THIS.