A C195 PLT; SITTING IN THE L SEAT WITH THE OWNER IN THE R SEAT; LET THE ACFT LEAVE THE SIDE OF THE RWY AND NOSE OVER. THE RPTR THOUGHT THAT THE OWNER WOULD RPT THIS; BUT THE INCIDENT WAS NOT RPTED. POSSIBLE ERROR ADMITTED. ACFT DAMAGE MAINLY TO TAIL POST; PROP.

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THE C195 WAS BEING FLOWN IN THE L SEAT BY ME; THE R SEAT OCCUPIED BY THE OWNER; A 20000+ HR AIRLINE PLT. I HAVE APPROX 200 HRS TAIL DRAGGER TIME WITH 150 HRS IN THE LAST 12 MONTHS. I HAVE APPROX 35 HRS OF THIS SPECIFIC C195 FLYING TIME. THE AIRPLANE WAS FLOWN STRICTLY FOR A FEW TOUCH-AND-GOES AT LODI. THE FIRST PATTERN FLOWN WAS BY THE OWNER FROM THE R SEAT. PATTERN UNEVENTFUL TO FULL STOP. I FLEW THE SECOND PATTERN FROM THE L SEAT. ON LNDG; ALL WAS UNEVENTFUL. AT NEAR TAXI SPD; END OF LNDG; IT APPEARS TO HAVE STARTED A PARTIAL R WHEEL SKID STARTING A R TURN. L RUDDER PROGRESSIVELY UTILIZED BY BOTH PLTS WITH EVENTUAL L BRAKE. THE C195 CONFIRMED ITS R TRACK INTO THE DIRT SHOULDER. JUST BEFORE STOP; THE PLANE ROLLED THROUGH A PREVIOUS DEEP TIRE TRACK (SHALLOW DITCH); STRUCK PROP TO GND ONLY 2 TIMES AND BASICALLY NOSED DOWN AND FELL ONTO ITS BACK. DAMAGE MAINLY TO TAIL POST; NO SIGNIFICANT CABIN COMPARTMENT DAMAGE. NO STRUCTURES; LIGHTS; VEHICLES; OR PLANES OTHER THAN THE C195 INVOLVED. BOTH PLTS COMPLETELY UNINJURED. PLANE WAS RIGHTED AND BROUGHT TO HANGAR. I WAS PROBABLY CONSIDERED PIC AND DID NOT RPT IN A TIMELY MANNER. I LEFT CALIFORNIA EARLY THE NEXT DAY FOR 2 AND ONE HALF WKS IN SE ALASKA TO ACT AS A LCL EMER ROOM PHYSICIAN. I PROBABLY MISTAKENLY EXPECTED THE OWNER PLT TO DETERMINE THE NEED FOR RPT. I SHOULD HAVE INSURED THAT CORRECT ACTIONS WERE TAKEN. I MAY STILL HAVE BEEN CORRECT IN MY ACTIONS; BUT I AM NOT YET SURE. 3 DIFFERENT OPINIONS WERE MY TRIGGER THAT NO ONE YET REALLY KNOWS WHAT THE CORRECT ACTIONS SHOULD HAVE BEEN. DAMAGE ALL APPEARS TO BE SIMPLE UNBOLT AND REPLACE.