AN SMA PLT RAN INTO THE TOP OF A 7 FT HIGH EMBANKMENT AT THE END OF THE RWY TRYING TO TKOF.

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DID PREFLT. PAX BOARDED. DID PREFLT BRIEFING. USING CHKLIST I EXPLAINED HOW TO START AIRPLANE. CHKED WINDSOCK (CALM). TAXIED TO RWY 36 AND DID THE BEFORE TKOF CHK. APPLIED 2 NOTCHES OF FLAPS. CALLED UNICOM STATED 'READY FOR TKOF ON 36 AT COTTONWOOD.' CHKED WINDSOCK (CALM). GOT ON RWY 36 APPLIED FULL PWR. I INCREASED BACK PRESSURE TO GET PRESSURE OFF THE NOSE. LIFTOFF OCCURRED AROUND 40 KTS. I LOWERED THE NOSE STAYING IN GND EFFECT TO BUILD UP SPD. THE AIRPLANE ACCELERATED TO 70 KTS AND SETTLED BACK TO THE GND. I GLANCED AT AIR SPD INDICATOR AND WAS AROUND 65 KTS. I LOOKED UP AND THERE WAS AN EMBANKMENT IN FRONT OF ME. MY DECISION WAS EITHER HIT IT STRAIGHT ON OR TRY TO GO OVER AND LAND ON OTHER SIDE. I PULLED BACK ON THE YOKE AND BROUGHT THE AIRPLANE TO A POSITIVE ANGLE OF ATTACK. HIT THE BANK WITH ONE OF MY MAIN GEAR AND LANDED IN FIELD ON OTHER SIDE. SHUT EVERYTHING DOWN AND OFF ASKED IF EVERYONE WAS ALRIGHT AND HAD EVERYONE EVAC THE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATED THE LNDG GEAR WAS 'GONE;' AND THAT THE OCCURRENCE WAS CLASSIFIED AN ACCIDENT. THERE WERE NO INJURIES. THE RWY IS RATHER SHORT; 2200 FT; AND THE WX WAS HOT. THE ACFT WAS LOADED; BUT 'WELL WITHIN' THE PERFORMANCE PARAMETERS OF THE ACFT; OVER ROTATION IS A POSSIBILITY. THE ENG WAS NOT CHKED TO SEE IF IT WAS DEVELOPING FULL PWR. THE LCL CONSENSUS IS THAT THIS WAS PLT ERROR.