What was found
THERMAL AIRSHIP AT ABOUT 6:30 OUR ENG SHUTDOWN, NOTICED THE ENG WAS OVER TEMP. THE ROTAX PROVIDES FWD PROPULSION & PRESSURIZES THE CONTROL SURFACES SO WITHOUT THE ROTAX WE ARE NOW OPERATING AS A HOT AIR BALLOON & ONLY HAVE VERTICAL CONTROL WITH THE TWO LP BURNERS. THE WIND DIRECTION WAS NOW TAKING US AWAY & THE TFR TO THE NORTH WEST. NOTICED THE GAUGE TEMP DROPPING & IT PASSED BELOW THE RED LINE, RESTARTED THE ENG SUCCESSFULLY. REDUCED THE ENGS RPMS TO MINIMIZE THE ENG TEMP & POINTED TOWARD THE FIELD & DESCENDED. ABOUT 5 MIN AFTER THE FIRST ENG FAILURE, THE TEMP SPIKED & THE ENG SHUT DOWN AGAIN. AT ABOUT 200 FEET THE TEMP GAUGE SPIKED & THE ENG SHUT DOWN FOR THE THIRD TIME. LANDED IN THE PARKING LOT ABOUT 50 FEET FROM THE GRASS FIELD.