A POPPING OR BACKFIRING SOUND WAS HEARD BY SEVERAL PEOPLE WHO LATER OBSERVED THE ACFT FLYING AT LOW ALTITUDE ON WHAT APPEARED TO BE A FINAL APPROACH TO RWY 13 AT JENNINGS ARPT (LOCATED ABOUT 75 MI SW OF THE DEPARTURE POINT.) NO RADIOS WERE ONBOARD THE ACFT SO NO DISTRESS CALLS WERE MADE. BECAUSE OF THE WIND THIS WOULD HAVE BEEN A DOWNWIND LANDING. THE ACFT THEN ABORTED THE APPROACH DUE TO AN ACFT LANDING FROM THE OPPOSITE DIRECTION & APPEARED TO START A LEFT TURN ONTO ABASE LEG WHEN IT STALLED, PITCHED NOSE DOWN & IMPACTED THE GROUND WITH ITS LANDING GEAR & FLAPS EXTENDED. WRECKAGE EXAMINATION REVEALED THAT ALL 3 BLADES OF THE RIGHT PROP WERE BENT SMOOTHLY & SYMMETRICALLY REARWARD. HOWEVER, NO PRE- IMPACT FAILURE OR MALFUNCTION OF THE RIGHT ENG WAS FOUND. THERE WERE NO ENTRIES IN THE ACFT'S LOGBOOK FROM 7/1/78 UNTIL 4/3/84 WHEN THE ACFT WAS INSPECTED FOR THE FERRY FLT. THE PLT WAS NOT MULTI-ENG RATED & HAD NOT FLOWN THIS TYPE ACFT IN ABOUT 10 YEARS. THE PLT'S COMMERCIAL CERTIFICATE WAS REVOKED ON 11/21/81.