PIPER J3 PLT HAD A FORCED LNDG FROM 40-50 FT AGL AFTER THE ENG QUIT ON A TOUCH AND GO.

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2000 FT GRASS RWY/PVT AIRPARK. I HAD TAKEN OFF APPROX 20-25 MINS PRIOR TO THE INCIDENT; CRUISING AROUND THE AREA AND ENJOYING THE VIEW. RETURNED AND SET UP FOR VISUAL; RWY 32; TOUCH AND GO. ADDED PWR AFTER LNDG; GOT THE USUAL MOMENTARY COUGH FROM THE CONTINENTAL 65; WHICH THEN ACCELERATED NORMALLY. ROTATED APPROX 45 MPH AND BEGAN CLBOUT. 40-50 FT AGL AND ABOUT 3/4 OR MORE DOWN THE RWY; THE ENG ABRUPTLY QUIT. CONTINUING STRAIGHT AHEAD WASN'T AN OPTION AS THERE IS A SHARP DROP-OFF AT THE RWY END; FOLLOWED CLOSELY BY A FENCE WITH BRUSH AND TREES BEHIND IT. I BANKED R AND ANGLED TOWARDS THE SIDE YARD OF A NEIGHBOR'S HOUSE. R WING CAUGHT SOME TREE BRANCHES AS I CAME DOWN; AND ALSO HIT PARTS OF A PLASTIC FENCE. ACFT SKIDDED TO A HALT PRIOR TO 2 MORE LARGE TREES (FORTUNATELY). R WING LEADING EDGE DAMAGE AND SOME FABRIC TEARS ON R WING AND ACFT BELLY (FROM THE FENCE). NO INJURIES OR OTHER DAMAGE EXCEPT FOR THE FENCE. NEIGHBORS ASSISTED IN TOWING ACFT TO MY HANGAR. I RAN THE ENG TODAY. IT STARTED ON THE FIRST PULL AND RAN SMOOTHLY THROUGH ENTIRE RPM RANGE. TEMP WAS ABOUT 80 DEGS AT TIME OF THE INCIDENT. DEW POINT RPTED AS 56 DEGS IN THE AREA. I DIDN'T THINK CARB ICE WAS A FACTOR AS I WAS FLYING; AND DIDN'T USE CARB HEAT. HOWEVER; CARB ICE SEEMS TO BE THE ONLY EXPLANATION; SO I'LL BE USING CARB HEAT MORE OFTEN IN THE FUTURE; EVEN IF I THINK IT'S NOT REALLY NEEDED.