PLT OF A PIPER CUB TAKES OFF WHEN ANOTHER ACFT IS STILL ON THE RWY AT A NON TWR ARPT.

Narrative

AS I PREPARED TO DEPART FROM RWY 5; WHICH IS THE PREFERRED DEP RWY IN NO WIND CONDITIONS AT PEARSON ARPT; FL; I NOTICED A LOW WING PIPER ACFT ABOUT 1/3 THE WAY DOWN THE RWY. IT APPEARED THAT THE ACFT HAD JUST LANDED AND I ANTICIPATED IT WOULD TAXI OFF THE RWY AND RETURN TO THE PARKING AREA AT THE INITIAL END OF RWY 5. INSTEAD; THE ACFT ANNOUNCED HIS INTENTION TO BACK-TAXI THE FULL LENGTH OF RWY 23. I ACKNOWLEDGED HIS ANNOUNCEMENT AND STATED THAT I WOULD HOLD AT THE END OF RWY 5. WHEN IT APPEARED THAT HE HAD REACHED THE FAR END OF THE RWY; I ANNOUNCED THAT I WAS TAKING THE ACTIVE AND DEPARTING ON RWY 5. I WAITED FOR ANY RESPONSE FROM THE OTHER ACFT AND RECEIVING NONE; PROCEEDED TO TAKE OFF. I PASSED OVER THE END OF THE RWY AT AN ALT OF APPROX 350 FT AND NOTICED THE OTHER ACFT IN THE HOLD AREA AT THE END OF THE RWY. ALTHOUGH NO DANGER TO EITHER ACFT EXISTED; THE OTHER ACFT MADE SEVERAL COMMENTS ON THE UNICOM ABOUT MY WAITING UNTIL HE HAD CLRED THE RWY BEFORE MY DEPARTING. HE WAS RIGHT! I WAS IN ERROR! I SHOULD HAVE MADE A POSITIVE DETERMINATION THAT THE OTHER ACFT WAS CLR OF THE RWY BEFORE STARTING MY TKOF ROLL. I BELIEVE THE CONDITION WOULD HAVE BEEN AVOIDED; HOWEVER; HAD THE OTHER PLT USED THE PREFERRED NO WIND DEP RWY OR ADVISED ME THAT HE WAS NOT YET CLR OF THE RWY WHEN I ANNOUNCED MY TKOF INTENTIONS. UNDER NO CONDITIONS SHOULD AN ACFT LAND AND TAXI TO THE END OF THE RWY AND THEN TAKE OFF IN THE OPPOSITE DIRECTION (IF THAT IN FACT WAS WHAT THE OTHER ACFT WAS DOING).