RANS S6 PLT HAS FUEL EXHAUSTION AND MAKES AN OFF ARPT LNDG DURING APCH TO AMA.

Narrative

DURING A FERRY FLT ON BEHALF OF THE PURCHASER OF THE ACFT; I DEPARTED HOT SPRINGS; ARK; WBOUND TOWARDS ALBUQUERQUE. I LANDED IN ZZZ1 FOR FUEL; BUT THE ARPT WAS DESERTED. AFTER FIGURING THE RATE OF FUEL BURN FOR THE PREVIOUS 3 LEGS OF THE TRIP AND ASSESSING THE TIME FLOWN ON THIS LEG SO FAR; I CALCULATED THAT THERE WAS MORE THAN SUFFICIENT FUEL TO CONTINUE ON TO ZZZ. AFTER DEPARTING FROM ZZZ1; I NOTICED THAT THE VOLTAGE METER WAS READING ZERO; AND THAT I WAS BEGINNING TO LOSE ELECTRICAL EQUIP ON THE PANEL; INCLUDING THE RADIO AND XPONDER. I WAS ABLE TO MAKE MYSELF READABLE TO ZZZ APCH ON A HANDHELD RADIO; BUT PROBABLY LOST SOME OF THEIR XMISSIONS WHEN I ACCIDENTALLY HIT FREQ-CHANGE BUTTONS DURING TURB. I WAS VECTORED NE FOR RWY 22; BEHIND OTHER TFC. THE ENG QUIT ON ABOUT A 1-MI FINAL; AND I WAS ABLE TO SUCCESSFULLY LAND IN A PASTURE; NO DAMAGE TO THE ACFT; NO INJURIES. AFTER LNDG; MR X FROM THE FIRE DEPT WITNESSED FOR ME THAT THE CLR-TUBING FUEL SIGHT GAUGES IN THE WING ROOTS SHOWED FUEL REMAINING (THE POH INDICATES THAT ALL FUEL IN THE TANKS IS USABLE). APPARENTLY; I WAS ALSO TRAVELING WITHOUT THE OPERATING LIMITATIONS DATA REQUIRED FOR AN EXPERIMENTAL ACFT. THIS WAS MY FIRST EXPERIENCE WITH AN EXPERIMENTAL ACFT; AND I WAS UNDER THE MISIMPRESSION THAT SUCH LIMITATIONS WERE ONLY REQUIRED FOR THE FIRST TEST PHASES OF FLT AFTER AN ACFT IS FINISHED.